DOCSLIB.ORG

Abstract Listings

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Abstract Listings Abstract of Papers Submitted to 2017 MSEC‐NAMRC‐ICMP 1 Paper Number Page Paper Number Page Paper Number Page Paper Number Page MSEC2017‐2603 5 MSEC2017‐2702 18 MSEC2017‐2771 29 MSEC2017‐2835 41 MSEC2017‐2604 5 MSEC2017‐2703 18 MSEC2017‐2773 30 MSEC2017‐2839 42 MSEC2017‐2605 5 MSEC2017‐2704 19 MSEC2017‐2774 30 MSEC2017‐2840 42 MSEC2017‐2611 6 MSEC2017‐2705 19 MSEC2017‐2775 30 MSEC2017‐2841 42 MSEC2017‐2614 6 MSEC2017‐2708 19 MSEC2017‐2776 31 MSEC2017‐2843 42 MSEC2017‐2615 7 MSEC2017‐2710 19 MSEC2017‐2777 31 MSEC2017‐2847 43 MSEC2017‐2619 7 MSEC2017‐2711 20 MSEC2017‐2778 31 MSEC2017‐2850 43 MSEC2017‐2621 7 MSEC2017‐2712 20 MSEC2017‐2779 32 MSEC2017‐2853 43 MSEC2017‐2624 8 MSEC2017‐2715 20 MSEC2017‐2780 32 MSEC2017‐2854 44 MSEC2017‐2626 8 MSEC2017‐2719 21 MSEC2017‐2781 32 MSEC2017‐2856 44 MSEC2017‐2630 8 MSEC2017‐2720 21 MSEC2017‐2782 33 MSEC2017‐2858 44 MSEC2017‐2638 9 MSEC2017‐2721 21 MSEC2017‐2783 33 MSEC2017‐2860 45 MSEC2017‐2639 9 MSEC2017‐2723 22 MSEC2017‐2786 33 MSEC2017‐2863 45 MSEC2017‐2641 10 MSEC2017‐2725 22 MSEC2017‐2787 34 MSEC2017‐2864 45 MSEC2017‐2643 10 MSEC2017‐2726 22 MSEC2017‐2788 34 MSEC2017‐2871 46 MSEC2017‐2644 10 MSEC2017‐2731 22 MSEC2017‐2789 34 MSEC2017‐2872 46 MSEC2017‐2654 11 MSEC2017‐2733 23 MSEC2017‐2790 35 MSEC2017‐2873 46 MSEC2017‐2656 11 MSEC2017‐2734 23 MSEC2017‐2792 35 MSEC2017‐2874 47 MSEC2017‐2657 12 MSEC2017‐2735 23 MSEC2017‐2794 34 MSEC2017‐2877 47 MSEC2017‐2659 12 MSEC2017‐2736 24 MSEC2017‐2796 36 MSEC2017‐2878 47 MSEC2017‐2665 12 MSEC2017‐2737 24 MSEC2017‐2797 36 MSEC2017‐2879 48 MSEC2017‐2666 13 MSEC2017‐2739 24 MSEC2017‐2798 36 MSEC2017‐2880 48 MSEC2017‐2673 13 MSEC2017‐2741 24 MSEC2017‐2803 36 MSEC2017‐2882 48 MSEC2017‐2674 13 MSEC2017‐2742 25 MSEC2017‐2807 37 MSEC2017‐2886 48 MSEC2017‐2678 14 MSEC2017‐2746 25 MSEC2017‐2809 37 MSEC2017‐2887 49 MSEC2017‐2679 14 MSEC2017‐2747 25 MSEC2017‐2811 37 MSEC2017‐2888 49 MSEC2017‐2680 15 MSEC2017‐2749 26 MSEC2017‐2814 38 MSEC2017‐2889 49 MSEC2017‐2681 15 MSEC2017‐2752 26 MSEC2017‐2815 38 MSEC2017‐2891 50 MSEC2017‐2684 15 MSEC2017‐2753 26 MSEC2017‐2817 38 MSEC2017‐2892 50 MSEC2017‐2687 15 MSEC2017‐2755 26 MSEC2017‐2818 39 MSEC2017‐2893 50 MSEC2017‐2689 16 MSEC2017‐2756 27 MSEC2017‐2823 39 MSEC2017‐2894 51 MSEC2017‐2690 16 MSEC2017‐2758 27 MSEC2017‐2825 39 MSEC2017‐2895 51 MSEC2017‐2691 16 MSEC2017‐2759 27 MSEC2017‐2826 40 MSEC2017‐2896 51 MSEC2017‐2692 16 MSEC2017‐2760 28 MSEC2017‐2827 40 MSEC2017‐2898 51 MSEC2017‐2694 17 MSEC2017‐2763 28 MSEC2017‐2829 40 MSEC2017‐2900 52 MSEC2017‐2695 17 MSEC2017‐2765 28 MSEC2017‐2830 41 MSEC2017‐2904 52 MSEC2017‐2699 17 MSEC2017‐2766 29 MSEC2017‐2833 41 MSEC2017‐2906 52 MSEC2017‐2700 18 MSEC2017‐2769 29 MSEC2017‐2834 41 MSEC2017‐2907 52 2 Paper Number Page Paper Number Page Paper Number Page Paper Number Page MSEC2017‐2909 53 MSEC2017‐2974 65 MSEC2017‐3029 77 MSEC2017‐3119 89 MSEC2017‐2911 53 MSEC2017‐2975 65 MSEC2017‐3030 77 MSEC2017‐3147 89 MSEC2017‐2913 53 MSEC2017‐2978 65 MSEC2017‐3031 77 MSEC2017‐3162 89 MSEC2017‐2915 54 MSEC2017‐2979 65 MSEC2017‐3032 78 MSEC2017‐3163 89 MSEC2017‐2918 54 MSEC2017‐2980 66 MSEC2017‐3034 78 MSEC2017‐3164 90 MSEC2017‐2921 54 MSEC2017‐2981 66 MSEC2017‐3035 78 MSEC2017‐3165 90 MSEC2017‐2924 55 MSEC2017‐2982 66 MSEC2017‐3036 78 MSEC2017‐3166 90 MSEC2017‐2926 55 MSEC2017‐2983 67 MSEC2017‐3037 79 MSEC2017‐3167 90 MSEC2017‐2927 55 MSEC2017‐2985 67 MSEC2017‐3038 79 MSEC2017‐3168 91 MSEC2017‐2928 56 MSEC2017‐2987 67 MSEC2017‐3039 79 MSEC2017‐3169 91 MSEC2017‐2930 56 MSEC2017‐2989 68 MSEC2017‐3043 80 MSEC2017‐3170 91 MSEC2017‐2932 56 MSEC2017‐2991 68 MSEC2017‐3045 80 MSEC2017‐3171 91 MSEC2017‐2934 57 MSEC2017‐2992 68 MSEC2017‐3046 80 MSEC2017‐3172 92 MSEC2017‐2935 57 MSEC2017‐2993 68 MSEC2017‐3047 81 MSEC2017‐3174 92 MSEC2017‐2936 57 MSEC2017‐2994 69 MSEC2017‐3048 81 MSEC2017‐3175 92 MSEC2017‐2937 58 MSEC2017‐2997 69 MSEC2017‐3049 81 MSEC2017‐3177 92 MSEC2017‐2938 58 MSEC2017‐2999 69 MSEC2017‐3050 81 MSEC2017‐3178 93 MSEC2017‐2939 58 MSEC2017‐3000 70 MSEC2017‐3051 82 MSEC2017‐3179 93 MSEC2017‐2940 59 MSEC2017‐3001 70 MSEC2017‐3052 82 MSEC2017‐3180 93 MSEC2017‐2941 59 MSEC2017‐3002 70 MSEC2017‐3054 82 MSEC2017‐3181 93 MSEC2017‐2942 59 MSEC2017‐3003 71 MSEC2017‐3058 83 MSEC2017‐3182 94 MSEC2017‐2944 59 MSEC2017‐3006 71 MSEC2017‐3059 83 MSEC2017‐2947 60 MSEC2017‐3007 71 MSEC2017‐3060 83 MSEC2017‐2949 60 MSEC2017‐3008 72 MSEC2017‐3061 84 MSEC2017‐2951 60 MSEC2017‐3009 72 MSEC2017‐3062 84 MSEC2017‐2952 61 MSEC2017‐3012 72 MSEC2017‐3065 84 MSEC2017‐2954 61 MSEC2017‐3014 73 MSEC2017‐3069 84 MSEC2017‐2955 61 MSEC2017‐3015 73 MSEC2017‐3072 85 MSEC2017‐2956 62 MSEC2017‐3016 73 MSEC2017‐3074 85 MSEC2017‐2957 62 MSEC2017‐3018 74 MSEC2017‐3075 85 MSEC2017‐2958 62 MSEC2017‐3019 74 MSEC2017‐3080 86 MSEC2017‐2960 62 MSEC2017‐3020 74 MSEC2017‐3084 86 MSEC2017‐2962 63 MSEC2017‐3021 75 MSEC2017‐3090 87 MSEC2017‐2965 63 MSEC2017‐3022 75 MSEC2017‐3091 87 MSEC2017‐2966 63 MSEC2017‐3024 75 MSEC2017‐3092 87 MSEC2017‐2970 63 MSEC2017‐3026 76 MSEC2017‐3093 87 MSEC2017‐2972 64 MSEC2017‐3027 76 MSEC2017‐3098 88 MSEC2017‐2973 64 MSEC2017‐3028 76 MSEC2017‐3104 88 3 NOTES 4 The Effects of Laser and Mechanical Forming on the Hardness and Microstructural Layout of Commercially Pure Grade 2 Titanium Alloy Plates Technical Publication. MSEC2017‐2603 Kadephi V Mjali, Cape Peninsula University of Technology, Cape Town, Western Cape, South Africa, Peter Madindwa Mashinini, University of Johannesburg, Johannesburg, South Africa, Annelize Els‐Botes, CSIR, Pretoria, Gauteng, South Africa This paper illustrates the effects of the laser and mechanical forming on the hardness and microstructural distribution in commercially pure grade 2 titanium alloy plates. The two processes were used to bend commercially pure grade 2 titanium alloy plates to a similar radius also investigate if the laser forming process could replace the mechanical forming process in the future. The results from both processes are discussed in relation to the mechanical properties of the material. Observations from hardness testing indicate that the laser forming pro‐ cess results in increased hardness in all the samples evaluated, and on the other hand, the mechanical forming process did not influence hardness on the samples evaluated. There was no change in microstructure as a result of the mechanical forming process while the laser forming process had a major influence on the overall microstructure in samples evaluated. The size of the grains became larger with in‐ creases in thermal gradient and heat flux, causing changes to the overall mechanical properties of the material. The thermal heat generated has a profound influence on the grain structure and the hardness of titanium. It is evident that the higher the thermal energy the higher is the hardness, but this only applies up to a power of 2,5kW. Afterwards, there is a reduction in hardness and an increase in grain size. The cooling rate of the plates has been proved to play a significant role in the resulting microstructure of titanium alloys. The scanning speed plays a role in maintaining the surface temperatures of laser formed titanium plates resulting in changes to both hardness and the micro‐ structure. An increase in heat results in grain growth affecting the hardness of titanium. Residual Stress Distribution and the Concept of Total Fatigue Stress in Laser and Mechanically Formed Commercially Pure Grade 2 Titanium Alloy Plates Technical Publication. MSEC2017‐2604 Kadephi V Mjali, Cape Peninsula University of Technology, Cape Town, Western Cape, South Africa, Peter Madindwa Mashinini, University of Johannesburg, Johannesburg, South Africa, Annelize Els‐Botes, CSIR, Pretoria, Gauteng, South Africa This paper discusses the investigation of residual stresses developed as a result of mechanical and laser forming processes in commercially pure grade 2 titanium alloy plates as well as the concept of total fatigue stress. The intention of the study was to bend the plates using the respective processes to a final radius of 120mm using both processes. The hole drilling method was used to measure residual strains in all the plates. High stress gradients were witnessed in the current research and possible cases analyzed and investigated. The effects of pro‐ cessing speeds and powers used also played a significant role in the residual stress distribution in all the formed plates. A change in laser power resulted in changes to residual stress distribution in the plates evaluated. This study also dwells into how the loads that are not normally incorporated in fatigue testing influence fatigue life of commercially pure grade 2 titanium alloy plates. Also, the parent material was used to benchmark the performance of the two forming processes in terms of stresses developed. Residual stresses developed from the two forming processes and the parent material used together with the mean stress was incorporated into the alternating stress from the fatigue machine to develop the concept of total fatigue stress. This exercise indicated the effect of these stresses on the fatigue life of the parent material, laser and mechanically formed plate samples. A strong link between these stresses was obtained and formulae ex‐ plaining the relationship formulated. A comparison between theory and practical application shown by test results is found to be satisfac‐ tory in explaining concerns that may arise. The laser forming process is more influential in the development of residual stress, compared to the mechanical forming process. With each parameter change in laser forming there is a change in residual stress arrangement. Under the influence of laser forming the stress is more tensile in nature making the laser formed more susceptible to early fatigue failure.
Load more

Recommended publications
  • High-Power Solid-State Lasers from a Laser Glass Perspective
    LLNL-JRNL-464385 High-Power Solid-State Lasers from a Laser Glass Perspective J. H. Campbell, J. S. Hayden, A. J. Marker December 22, 2010 Internationakl Journal of Applied Glass Science Disclaimer This document was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor Lawrence Livermore National Security, LLC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or Lawrence Livermore National Security, LLC. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or Lawrence Livermore National Security, LLC, and shall not be used for advertising or product endorsement purposes. High-Power Solid-State Lasers from a Laser Glass Perspective John H. Campbell, Lawrence Livermore National Laboratory, Livermore, CA Joseph S. Hayden and Alex Marker, Schott North America, Inc., Duryea, PA Abstract Advances in laser glass compositions and manufacturing have enabled a new class of high-energy/high- power (HEHP), petawatt (PW) and high-average-power (HAP) laser systems that are being used for fusion energy ignition demonstration, fundamental physics research and materials processing, respectively. The requirements for these three laser systems are different necessitating different glasses or groups of glasses.
    [Show full text]
  • MECA SENS 2017 Programme& Abstracts
    9th International Conference on Mechanical Stress Evaluation by Neutron and Synchrotron Radiation Hosted by the South African Nuclear Energy Corporation (Necsa) SOC Limited in cooperation with the International Atomic Energy Agency (IAEA) & ABSTRACTS PROGRAMME MECA SENS 2017 Programme & Abstracts MECA SENS 2017 Local Organising Committee Contents Committees 2 Foreword 2 Local Organising Committee 3 Programme Advisory Committee 3 International Scientific Committee 4 Sponsors 5 Event Information 6 Location 6 Registration 9 Internet 9 Catering 9 Presentations 10 Poster session 10 Certificate of attendance 10 Community outreach 10 Programme 11 Spring School - Monday 18 Sept 11 Day 1 – Tuesday 19 Sept 12 Day 2 – Wednesday 20 Sept 13 Day 3 – Thursday 21 Sept 14 List of Abstracts 15 Alain Lodini Plenary Lecture 23 Keynote Presentations 24 Invited Presentations 26 Oral Presentations 42 Poster Presentations 91 School lectures 114 List of Attendees 122 Author Index 126 1 | MECA SENS 2017, Skukuza, South Africa Committees Foreword Dear colleagues On behalf of the Organising Committee, it is a great privilege to welcome and receive you at the Nombolo Mdhluli Conference Centre in the Skukuza Rest Camp, capital of the UNESCO Biosphere Kruger National Park for the proceedings of MECA SENS 2017. This conference continues the tradition of providing a vibrant interactive forum for scientists, students and engineers interested in the most recent developments and capabilities of diffraction based techniques, complemented by mechanical and image-based methods towards rendering information on the prevailing stress conditions and material performance. We thank all participants for submitting excellent contributions. This has enabled the assembly of an exciting scientific program for the next three days.
    [Show full text]
  • Characterization of Laser Peening- Induced Effects on a Biomedical Ti6al4v Alloy by Thermoelectric Means
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Digital.CSIC Characterization of laser peening- induced effects on a biomedical Ti6Al4V alloy by thermoelectric means Hector Carreón Sandra Barriuso Juan Antonio Porro Jose Luis González-Carrasco José Luis Ocaña Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 09/23/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 53(12), 122502 (December 2014) Characterization of laser peening-induced effects on a biomedical Ti6Al4V alloy by thermoelectric means Hector Carreón,a,* Sandra Barriuso,b Juan Antonio Porro,c Jose Luis González-Carrasco,b,d and José Luis Ocañac aInstituto de Investigaciones Metalúrgicas, UMSNH-IIM, Edif. “U” C.U., 58000-888 Morelia, Mexico bCentro Nacional de Investigaciones Metalúrgicas, CENIM-CSIC, Avenida Gregorio del Amo 8, 28040 Madrid, Spain cUniversidad Politécnica de Madrid, Ctr. Láser UPM, 28040 Madrid, Spain dCentro Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, 28029 Madrid, Spain Abstract. Laser peening has recently emerged as a useful technique to overcome detrimental effects associ- ated with other well-known surface modification processes such as shot peening or grit blasting used in the biomedical field. It is worthwhile to notice that besides the primary residual stress effect, thermally induced effects might also cause subtle surface and subsurface microstructural changes that might influence corrosion resistance and fatigue strength of structural components. In this work, plates of Ti-6Al-4V alloy of 7 mm in thick- ness were modified by laser peening without using a sacrificial outer layer. Irradiation by a Q-switched Nd-YAG laser (9.4-ns pulse length) working at the fundamental 1064-nm wavelength at 2.8 J∕pulse and with water as a confining medium was used.
    [Show full text]
  • Laser Peening Without Coating: Process, Effects and Applications
    LASER PEENING WITHOUT COATING: PROCESS, EFFECTS AND APPLICATIONS Y. Sano 1, N. Mukai 1, M. Obata 1 1 Toshiba Corporation, 8 Shinsugita-cho Isogo-ku Yokohama 235-8523, Japan ABSTRACT This paper reviews the current status of research, development and application on laser peening without coating (LPwC). LPwC imparts compressive residual stress on material by irradiating laser pulses under aqueous environment without any surface preparation. LPwC can be operated without restriction on absorption by water, using water-penetrable green lasers. The effect penetrates 1mm or more, much deeper than that of conventional surface treatment such as shot peening. Accelerating stress corrosion cracking (SCC) tests showed that LPwC effectively prevented the initiation of SCC in sensitized austenitic stainless steels, nickel-based alloys and their weld metals. LPwC remarkably improved high-cycle fatigue properties of steels, aluminum alloys, titanium alloys. Retardation of crack propagation due to stress corrosion and fatigue was also confirmed. LPwC has been utilized to prevent SCC in Japanese nuclear power plants (NPPs) since 1999. KEY WORDS Laser peening, Residual stress, Stress corrosion cracking, Fatigue INTRODUCTION Recent advances in laser material processing have yielded a multitude of innovative processes and applications in various fields. Laser peening without coating (LPwC) is a typical example and blazed a trail in preventive maintenance for SCC in operating nuclear power plants (NPPs), taking full advantage of the inertia-less process over mechanical treatment (Sano, 2000a). LPwC was invented about a decade ago as a surface enhancement technology to introduce compressive residual stress on materials, while exploring new applications of copper vapor lasers (Konagai, 1995).
    [Show full text]
  • Contents Articles
    Volume 97, Number 5, September-October 1992 Journal of Research of the National Institute of Standards and Technology Contents Articles The Characterization of a Piston Displacement-Type G. E. Mattingly 509 Flowmeter Calibration Facility and the Calibration and Use of Pulsed Output Type Flowmeters A General Waveguide Circuit Theory Roger B. Marks and 533 Dylan F. Williams Resistive Liquid-Vapor Surface Sensors for Liquid J. D. Siegwarth, R. 0. Voth, 563 Nitrogen and Hydrogen and S. M. Snyder Fracture Toughness of Advanced Ceramics George D. Quinn, Jonathan 579 at Room Temperature Salem, Isa Bar-on, Kyu Cho, Michael Foley, and Ho Fang Errata Erratum: Optical Calibration of a Submicrometer Jon Geist, Barbara Belzer, 609 Magnification Standard Mary Lou Miller, and Peter Roitman ConferenceReports Data Administration Management Association Symposium Judith Newton 611 News Briefs GENERAL DEVELOPMENTS 615 Consortium to Develop Ceramic Machining Data Industry/NIST to Improve Advanced Polymer Systems Frequency Calibrations Using LORAN-C Explained Technology Centers Created for California, Minnesota 616 CRADA Partners to Study Concrete Failure During Fire Have You Heard? New Noise Standard Developed "Superconductivity Report" Now Available on VHS Two Views of Protein Puzzles Prove Better Than One Volume 97, Number 5, September-October 1992 Journal of Research of the National Institute of Standards and Technology New Biosensor Consortium Seeks Members 617 NIST/Industry to Study Cryptography Infrastructures Standards Needs on Diamond Films Cited
    [Show full text]
  • 2014 Year in Review
    NEWSLINE 2014 YEAR IN REVIEW LAWRENCE LIVERMORE NATIONAL LABORATORY NOTE NEWSLINE: LOOKING BACK AT 2014 CONTENTS Top 10 science and technology stories of 2014 Top 10 science stories . 2 n 2014, Lawrence Livermore National Laboratory (LLNL) built on a 62-year tradition January . 4 of translating basic science into technologies that ensure national security, address February . 7 I pressing real world problems and expand the boundaries of fundamental science. TOP March . 10 April . 13 The top stories of the year are a reflection of the Laboratory’s ability to apply its core May . 16 national security competencies to a broad set of rapidly evolving national and global 10 June . 19 challenges, including: energy, climate change, biodefense and detection, forensic July . 23 science, high performance computing and materials science. August . 26 September . 29 The capabilities developed and applied to this research, such as high performance computing (HPC) and additive October . 32 manufacturing, also serve to enhance the nation’s economic vitality and global competitiveness. November . 36 December . 41 Because evaluating the long-term impact of recent scientific developments on a field of study or science Recognition and Awards . 44 in general is difficult at best, the following advances are not listed in order of scientific importance. These This issue of Newsline was produced by the Public represent only a sampling of the science and technology produced at Lawrence Livermore during the 2014 Affairs Office. It represents a sample of the science and technology, people and operations highlights of calendar year. the year. It is available on the LLNL website. On the cover: Top stories of the year.
    [Show full text]
  • Diamond Machining of Silicon: a Review of Advances in Molecular Dynamics Simulation
    Diamond machining of silicon: A review of advances in molecular dynamics simulation Goel, S., Luo, X., Agrawal, A., & Reuben, R. L. (2015). Diamond machining of silicon: A review of advances in molecular dynamics simulation. International Journal of Machine Tools and Manufacture, 88, 131-164. https://doi.org/10.1016/j.ijmachtools.2014.09.013 Published in: International Journal of Machine Tools and Manufacture Document Version: Peer reviewed version Queen's University Belfast - Research Portal: Link to publication record in Queen's University Belfast Research Portal Publisher rights Copyright 2014 Elsevier This is the author’s version of a work that was accepted for publication in International Journal of Machine Tools and Manufacture. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Machine Tools and Manufacture, [VOL 88, (January 2015)] doi:10.1016/j.ijmachtools.2014.09.013 General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws.
    [Show full text]
  • Effective Simulation and Optimization of a Laser Peening Process BE ACCEPTED in PARTIAL FULFILLMENT of the REQUIREMENTS for the DEGREE of Doctor of Philosophy
    Effective Simulation and Optimization of a Laser Peening Process A dissertation submitted in partial fulfillment of the requirements for the degree of the Doctor of Philosophy By GULSHAN SINGH B.S., Jai Narain Vyas University, Jodhpur, India, 2001 M.Tech., Indian Institute of Technology, Kanpur, India, 2003 2009 Wright State University Wright State University SCHOOL OF GRADUATE STUDIES August 10, 2009 I HEREBY RECOMMEND THAT THE DISSERTATION PREPARED UN- DER MY SUPERVISION BY GULSHAN SINGH ENTITLED Effective Simulation and Optimization of a Laser Peening Process BE ACCEPTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Doctor of Philosophy . Ramana V. Grandhi, Ph.D. Dissertation Director Ramana V. Grandhi, Ph.D. Director, Engineering Ph.D. Program Joseph F. Thomas, Jr., Ph.D. Dean, School of Graduate Studies Committee on Final Examination Ramana V. Grandhi, Ph.D. Nathan Klingbeil, Ph.D. Ravi Penmetsa, Ph.D. Allan H. Clauer, Ph.D. Robert Brockman, Ph.D. ii Abstract Singh, Gulshan, Ph.D. in Engineering Program, Wright State University, 2009. Effective Simulation and Optimization of a Laser Peening Process. Laser peening (LP) is a surface enhancement technique that has been applied to improve fatigue and corrosion properties of metals. The ability to use a high energy laser pulse to generate shock waves, inducing a compressive residual stress field in metallic materials, has applications in multiple fields such as turbomachinery, airframe structures, and medical appliances. In the past, researchers have investigated the effects of LP parameters experimentally and performed a limited number of simulations on simple geometries. However, monitoring the dynamic, intricate relationships of peened materials experimentally is time consuming, expensive, and challenging.
    [Show full text]
  • Design and Fabrication of Nonconventional Optical Components by Precision Glass Molding
    Design and Fabrication of Nonconventional Optical Components by Precision Glass Molding DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of the Ohio State University By Peng He Graduate Program in Industrial and Systems Engineering The Ohio State University 2014 Dissertation Committee: Dr. Allen Y. Yi, Advisor Dr. Jose M. Castro Dr. L. James Lee Copyright by Peng He 2014 Abstract Precision glass molding is a net-shaping process to fabricate glass optics by replicating optical features from precision molds to glass at elevated temperature. The advantages of precision glass molding over traditional glass lens fabrication methods make it especially suitable for the production of optical components with complicated geometries, such as aspherical lenses, diffractive hybrid lenses, microlens arrays, etc. Despite of these advantages, a number of problems must be solved before this process can be used in industrial applications. The primary goal of this research is to determine the feasibility and performance of nonconventional optical components formed by precision glass molding. This research aimed to investigate glass molding by combing experiments and finite element method (FEM) based numerical simulations. The first step was to develop an integrated compensation solution for both surface deviation and refractive index drop of glass optics. An FEM simulation based on Tool-Narayanaswamy-Moynihan (TNM) model was applied to predict index drop of the molded optical glass. The predicted index value was then used to compensate for the optical design of the lens. Using commercially available general purpose software, ABAQUS, the entire process of glass molding was simulated to calculate the surface deviation from the adjusted lens geometry, which was applied to final mold shape modification.
    [Show full text]
  • High-Precision Micro-Machining of Glass for Mass-Personalization and Submitted in Partial Fulfillment of the Requirements for the Degree Of
    High-precision micro-machining of glass for mass-personalization Lucas Abia Hof A Thesis In the Department of Mechanical, Industrial and Aerospace Engineering Presented in Partial Fulfillment of the Requirements For the Degree of Doctor of Philosophy (Mechanical Engineering) at Concordia University Montreal, Québec, Canada June 2018 © Lucas Abia Hof, 2018 CONCORDIA UNIVERSITY School of Graduate Studies This is to certify that the thesis prepared By: Lucas Abia Hof Entitled: High-precision micro-machining of glass for mass-personalization and submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Mechanical Engineering) complies with the regulations of the University and meets the accepted standards with respect to originality and quality. Signed by the final examining committee: ______________________________________ Chair Dr. K. Schmitt ______________________________________ External Examiner Dr. P. Koshy ______________________________________ External to Program Dr. M. Nokken ______________________________________ Examiner Dr. C. Moreau ______________________________________ Examiner Dr. R. Sedaghati ______________________________________ Thesis Supervisor Dr. R. Wüthrich Approved by: ___________________________________________________ Dr. A. Dolatabadi, Graduate Program Director August 14, 2018 __________________________________________________ Dr. A. Asif, Dean Faculty of Engineering and Computer Science Abstract High-precision micro-machining of glass for mass- personalization Lucas Abia Hof,
    [Show full text]
  • Three Meter Capacity Diamond Turning Machine for X-Ray Telescope Components
    Dallas Optical Systems, Inc. NASA RFI Solicitation: NNH11ZDA018L Three Meter Capacity Diamond Turning Machine For X-Ray Telescope Components Enabling Technology: A 3 meter capacity diamond turning machine will be enabling technology for low cost fabrication of x-ray telescope optical components. Three Meter Capacity Diamond Turning Machine For X-Ray Telescope Components Submitted by: John M. Casstevens, President email: [email protected] Dallas Optical Systems, Inc. 1790 Connie Lane Rockwall, Texas 75032-6708 The technology readiness level (TRL) for this technology is 5 to 6. Based on previous experience of building a similar machine and facility the rough order of magnitude cost to establish the proposed capability to manufacture and certify x-ray mirror glass slumping mandrels meeting IXO specifications will not exceed $300M. Identification and Significance of the Enabling Technical Innovation The ranking of IXO as the fourth-priority large space mission in the National Academy Astro2010 Decadal Report reflects the technical, cost, and programmatic uncertainties associated with the project at the current time. A major emphasis in achieving a successful IXO is reducing the cost of the grazing incidence mirrors. Diamond turning has been proven to be able to produce highly aspheric optical contours to visible wavelength tolerances with extremely smooth surfaces. Diamond turning has the additional enabling capability to not only produce extremely smooth and accurate optical surfaces but also mechanical attachment surfaces and datums which allow extremely fast and complex optical components to be quickly and easily aligned. The productivity of diamond turning allows the production of quantities of optical components with exacting duplication of optical surfaces and metrology datums.
    [Show full text]
  • Vol. 14 :: No. 3 :: Jul – Sep 2019 Message from the Chairman
    Vol. 14 :: No. 3 :: Jul – Sep 2019 Message from the Chairman Dear IEEE Indian Members, I am happy to see that third issue of 2019 of India Council (IC) newsletter is being released. The newsletter is having information of India Council, Sections, Chapters, Affinity Groups etc., interesting articles on diverse fields of interest to our members along with few regular informative columns. I congratulate and thank the efforts taken by Mr. H.R. Mohan, Newsletter Editor. I would also like to put on record and thank the Section leaders who have extended their cooperation in providing the inputs to the newsletter. The flagship technical conference of India Council, INDICON-2019, will be held in Marwadi University, Rajkot, Gujarat in collaboration with IEEE Gujarat Section during December 13-15, 2019. Paper submission deadline is over, however, paper submission for focused session and M V Chouhan Paper contest is open till September 25, 2019. All India Student, Women in Engineering and Young Professional Congress (AISWYC) is to be held in Hyderabad during September 28-30, 2019. I am happy to share that Github, IEEE ComSoc, IEEE MTT-S, IEEE TEMS, and IEEE SPAA have sponsored AISYWC and more than 400 delegates have registered for the same. This year Life Member track is added to the Congress. During this third quarter of 2019, IC EGM and EXCOM was held on 27th July in WTC Brigade Gateway, Bangalore and IEEE India Office, Bangalore respectively. IC Bylaws amendments proposed by IC EXCOM were ratified during the EGM. Adoption of amendments to Article II, IV, V, VI and VIII of IC Bylaws in respect of objective, management, nomination and election of officers, eligibility criterion and finances were ratified by the general assembly.
    [Show full text]