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BOOK of ABSTRACTS Conferências 5: Book of Abstracts 15/05/2018, 08:15 4th International Conference on Mechanics of Composites 9-12 July 2018 Universidad Carlos III de Madrid, Spain Chairs: A. J. M. Ferreira (Univ. Porto, Portugal), Carlos Santiuste (Univ. Carlos III, Spain) BOOK OF ABSTRACTS Conferências 5: Book of Abstracts 15/05/2018, 08:15 Book of Abstracts 14470 | NUMERICAL MODELLING OF SOFT ARMOUR PANELS UNDER HIGH-VELOCITY IMPACTS (Composite Structures) Ester Jalón ([email protected]), Department of Continuum Mechanics and Structural Analysis, Universidad Carlos III de Madrid, Spain Marcos Rodriguez , Department of Mechanical Engineering, Universidad Carlos III de Madrid, Spain José Antonio Loya , Department of Continuum Mechanics and Structural Analysis, Universidad Carlos III de Madrid, Spain Carlos Santiuste , Department of Continuum Mechanics and Structural Analysis, Universidad Carlos III de Madrid, Spain Nowadays, the role of personal protection is crucial in order to minimize the morbidity and mortality from ballistic injuries. The aim of these research is to investigate the behavior of UHMWPE fibre under high-velocity impact. There are two different UHMWPE packages: ‘soft’ ballistics packages (SB) and rigid ‘hard’ ballistics packages (SB). UHMWPE UD has not been sufficiently analyzed since new SB layers have been manufactured. This work, compares the impact behavior of different UHMWPE composites using spherical projectiles. Firstly, the parameter affecting the ballistic capacity are determined in order to define an optimal configuration to fulfill the requirements of manufactured. Then, the experimental test are conducted on different single SB sheets under spherical projectiles. Finally, the FEM model is validated with experimental test on multilayer specimens of the different UD materials considered. A FEM model is developed to predict the response of UHMWPE sheets under ballistic impact and calibrated with the previous experimental test. The FEM model includes Hashin failure criteria to predict the different failure mechanisms of the composites. An excellent agreement between numerical predictions and experimental results was found. The authors acknowledge the Regional Government of Madrid under the project IND2017/IND-7762. 14514 | Fracture Toughness Evaluation of DCB specimen with New 1-thread Stitching in thickness direction. (Reinforcing method for composite materials) Kim, Cheol Hwan ([email protected]), Gyeongsang National University, Korea, South Tapullima, Jonathan A., Gyeongsang National University, Peru Choi, Jin Ho, Gyeongsang National University, Korea, South Laminated composite material has been widely used not only the aircraft structure but also the primary structure of other machinery such as automobile, ship, robot and etc. Laminated composite materials have high specific strength and stiffness, but the material properties of laminated composites in the thickness direction are much weaker than those of in-plane directions. Many researchers have developed the 3-D reinforcing method for laminated composite materials. Recently, we proposed new 1-thread stitching method combined with advantage of conventional stitching and Z-pinning. The proposed new 1-thread stitching process is a method to insert discontinuous fiber into laminated composite materials in through-thickness direction by perforated needle with air pressure. The New 1-thread stitching method can minimize in-plane damage of composite materials and improve z-directional properties through vertically aligned fibers and randomly arranged fibers on the composite surface. In this paper, new 1-thread stitching equipment was made and the mode-I fracture toughness of composite specimens reinforced with new stitching method were evaluated by DCB(Double Cantilever Beam) test. 14517 | Static strength of RTM composite joint by new stitching method (Reinforcing method for composite materials) An, Woo Jin ([email protected]), Gyeongsang National University, Korea, South Kim, Cheol Hwan, Gyeongsang National University, Korea, South Choi, Jin Ho, Gyeongsang National University, Korea, South Resin transfer molding (RTM) is a mass production process that can replace the autoclave process, and composite lap joints are widely used in composite structures. When a tensile load is applied to a single lap joint, not only shear stress but also tensile peel stress are produced due to the eccentric load effect. Reinforcing the composite joint in the thickness direction can reduce the shear stress generated in the joint as well as the peel stress, which can contribute greatly to the strength increase of the composite joint. Several reinforcing methods have been developed to improve through-thickness directional material properties, and stitching method is generally used. However, the conventional stitching method has a disadvantage in that it is not only complex in equipment but also can not use highly elastic brittle fibers such as carbon fiber. Recently, we proposed new 1-thread stitching method to minimize bending of carbon fibers and prevent their fracture. In this paper, a composite single-lap joint specimens using a new 1-thread stitching method were fabricated by a RTM process and their strengths were evaluated. The strengths of composite joint specimens fabricated with different stitching intervals and patterns were compared with those of specimens without stitching process. 14519 | A study on the in-plane tensile strength of composite stitched by the carbon fiber (Reinforcing method for composite materials) Yoon, Hyun Sung ([email protected]), Gyeongsang National University, Korea, South Kim, Cheol Hwan, Gyeongsang National University, Korea, South Choi, Jin Ho, Gyeongsang National University, Korea, South Carbon fiber reinforced composites are increasingly used in aircraft main structures due to their high specific strength and specific stiffness. But, composite laminates have low strength in the through thickness direction. As a solution to this problem, new techniques for reinforcing the thickness strength are continuously being developed. Stitching and z-pinning method are two typical methods to strengthen the through thickness direction strength. However, When the techniques are applied to prepreg, the reinforcement fiber in the prepreg is damaged, and the properties in the in-plane direction greatly degrades. In this study, we investigated the difference between in-plane physical properties of carbon fiber-embedded composite and laminated Z-pinned composite laminates using a stitching method. 14520 | Structural Analysis of Composite Laminate Using Novel Stitching Process (Reinforcing method for composite materials) Tapullima, Jonathan A. ([email protected]), Gyeongsang National University, Peru Kim, Cheol Hwan, Gyeongsang National University, Korea, South Choi, Jin Ho, Gyeongsang National University, Korea, South https://confadmin.mercatura.pt/gestao4/index.php?pagina=1367&filtro_ba=0&filtro_ordenar=2 Page 1 of 95 Conferências 5: Book of Abstracts 15/05/2018, 08:15 Based on previous studies, using the novel stitching process with only one thread, to compare the performance between the no-stitched and stitched laminate through the energy release rate with a modified Mode I analysis, it was concluded the needed to perform more analysis under standard test methods. In order to improve the results between the experiments and FEM analysis, standard test method for Mode I and Mode II were performed using different stitching patterns, and compare the through thickness strength with other reinforced methods. The stitched laminate properties obtained from the experiments are the main goal of this study, to design a numerical model which is necessary to predict the adequate behavior of the laminate using the proposed stitching process. 14386 | 3-3 PIEZOELECTRIC METAMATERALS WITH NEGATIVE AND ZERO POISSON’S RATIOS (Auxetic materials and structures ) Khan, Kamran A. ([email protected]), Khalifa University of Science and Technology, United Arab Emirates Khan, Muhammad A., Cranfield University, United Kingdom Khan, Sohaib Z., Islamic University of Madinah, Saudi Arabia Multifunctional structures are attractive for the development of energy conversion devices, structural health-monitoring systems, actuators, and sensors. Electroactive cellular materials such as piezoelectric cellular materials (PCMs) play a key role in advanced multifunctional composites industry by virtue of their unique elastic, dielectric and electromechanical coupling characteristics. The architecture-property relationship of cellular materials (PCMs) can be exploited to optimize piezoelectric cellular materials for specific applications. However there is a need to fully understand the role of the geometric cellular features on the dependence of the effective electromechanical properties. Here, we propose three classes of novel 3-3 piezoelectric metamaterials based on honeycomb like cellular networks. These included conventional hexagonal honeycomb structure, a re-entrant feature which is known to generate auxetic behavior and a semi-re-entrant which is constructed using alternate conventional and auxetic layers. The conventional honeycomb, re-entrant and semi re-entrant show variety of deformation behavior and can produce positive, negative and even zero Poisson’s ratio in certain configurations. Passive response of such cellular materials have been extensively studied. Here, three dimensional finite element (FE) models of 3-3 PCMs were developed to study their electromechanical properties. We investigate the effect of orientation of ligament for these three
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