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Ssc-475 Guidelines for Evaluation of Marine Finite NTIS #PB2019-###### SSC-475 GUIDELINES FOR EVALUATION OF MARINE FINITE ELEMENT ANALYSES Editors: Dr. E.D. Wang, Mr. J.S. Bone, Dr. M. Ma, and Mr. A. Dinovitzer This document has been approved for public release and sale; its distribution is unlimited. SHIP STRUCTURE COMMITTEE 2019 SHIP STRUCTURE COMMITTEE RDML Richard Timme RADM Lorin Selby U. S. Coast Guard Assistant Commandant Chief Engineer and Deputy Commander for Prevention Policy (CG-5P) For Naval Systems Engineering (SEA05) Co-Chair, Ship Structure Committee Co-Chair, Ship Structure Committee Mr. Jeffrey Lantz Mr. Derek Novak Director, Commercial Regulations and Standards (CG-5PS) Senior Vice President, Engineering & Technology U.S. Coast Guard American Bureau of Shipping Mr. H. Paul Cojeen Dr. John MacKay Society of Naval Architects and Marine Engineers Head, Warship Performance, DGSTCO Defence Research & Development Canada - Atlantic Mr. Kevin Kohlmann Mr. Luc Tremblay Director, Office of Safety Executive Director, Domestic Vessel Regulatory Oversight Maritime Administration and Boating Safety, Transport Canada Mr. Albert Curry Mr. Eric Duncan Deputy Assistant Commandant for Engineering and Group Director, Ship Integrity and Performance Engineering Logistics (CG-4D) (SEA 05P) U.S. Coast Guard Naval Sea Systems Command Mr. Neil Lichtenstein Dr. Thomas Fu Deputy Director N7x, Engineering Directorate Director, Ship Systems and Engineering Research Division Military Sealift Command Office of Naval Research SHIP STRUCTURE SUB-COMMITTEE UNITED STATES COAST GUARD (CVE) AMERICAN BUREAU OF SHIPPING CAPT Robert Compher Mr. Daniel LaMere Mr. Jaideep Sirkar Ms. Christina Wang Mr. Charles Rawson SOCIETY OF NAVAL ARCHITECTS AND MARINE DEFENCE RESEARCH & DEVELOPMENT CANADA ENGINEERS ATLANTIC Mr. Frederick Ashcroft Dr. Malcolm Smith Dr. Roger Basu Mr. Cameron Munro Dr. Robert Sielski Dr. Paul Miller MARITIME ADMINISTRATION TRANSPORT CANADA Mr. Todd Hiller Ms. Veronique Bérubé Mr. Todd Ripley Mr. Bashir Ahmed Golam Ms. Tayyebe Seif UNITED STATES COAST GUARD (FLEET) NAVSEA/ NSWCCD CAPT George Lesher Mr. David Qualley Mr. Martin Hecker Mr. Dean Schleicher Mr. Timothy McAllister Dr. Pradeep Sensharma Mr. Debu Ghosh Mr. Daniel Bruchman MILITARY SEALIFT COMMAND OFFICE OF NAVAL RESEARCH Ms. Jeannette Viernes Dr. Paul Hess PROJECT TECHNICAL COMMITTEE The Ship Structure Committee greatly appreciates the contributions of the individuals that volunteered their time to participate on the Project Technical Committee, listed below, and thanks them heartily. They were the subject matter expert representatives of the Ship Structure Committee to the contractor, performing technical oversight during contracting, advising the contractor in cognizant matters pertaining to the contract of which the agencies were aware, and performing technical peer review of the work in progress and upon completion. Chair: Dr. Paul Miller, US Coast Guard Academy Members: Dr. Roger Basu, Roger Basu & Associates Inc. Mr. Jason Cordell, US Coast Guard Mr. Paul Lara, US Navy Dr. Miguel Núñez-Sánchez, Universidad Politécnica de Madrid, Spain Mr. Earl Powers, US Coast Guard Mr. Charles Rawson, US Coast Guard Dr. Mahmud Sazidy, Defence Research and Development Canada Dr. Pradeep Sensharma, US Naval Sea Systems Command Dr. Robert Sielski LT Braden Rostad, US Coast Guard Ship Structure Committee Executive Director: LT Braden Rostad, US Coast Guard 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. NTIS #PB2019-###### SSC-475 4. Title and Subtitle 5. Report Date GUIDELINES FOR EVALUATION OF MARINE FINITE December 2019 ELEMENT ANALYSES 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. SR-1481 Dr. E.D. Wang, Mr. J.S. Bone, .Dr. M. Ma, and Mr. A. Dinovitzer 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) BMT Designes and Planners Inc.MIL Systems 2900 South Quincy Street, Suite 210 11. Contract or Grant No. Arlington, VA, 22206, United States 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Ship Structure Committee Final COMMANDANT (CG-ENG-2/SSC) ATTN (ADMIN ASST/SHIP STRUCTURE COMMITTEE) 14. Sponsoring Agency Code CG-5P US COAST GUARD 2703 MARTIN LUTHER KING JR. AVE SE MAILSTOP 7509 WASHINGTON DC 20593-7509 15. Supplementary Notes Sponsored by the Ship Structure Committee. The research completed by the above author for the Ship Structure Committee was reviewed by the Project Technical Committee for satisfactory completion of the objectives outlined in the Statement of Work developed and approved for funding by the Principal Members of the Ship Structure Committee. 16. Abstract Commercial and open source finite element analysis (FEA) programs can easily be used to model structures and generate impressive looking results even when fundamental mistakes are introduced by engineers with little previous design experience or with improper modeling techniques. This can result in inadequate structures from the point of view of strength, fatigue, vibration, and other design or analysis criteria. Some structural failures have demonstrated that, if not appropriately used, FEA may mislead the designer with erroneous results. The original SSC-387 Guideline for Evaluation of Finite Elements and Results published in 1996 addressed this concern. The use of finite element analysis (FEA) techniques in ship design and analysis has grown since the original SSC-387 Guideline for Evaluation of Finite Elements and Results was published in 1996. This guide is an update to SSC-387 and includes current best practices for FEA application to ship structures and advanced analysis topic discussion and sample applications for the following: Impact and Plasticity, Fracture and Fatigue, Whole Ship Analysis, and Frequency Response Vibration Analysis. This document structure follows the original document structure. This document provides, in checklists and discussions, support for the review of FEA models and output to ensure that the analysis is prepared appropriately for the intended situation. The document is no substitute for a solid education, enhanced by the experience of the impact of modeling choices on results. The document is to be construed as a guideline to assist the analyst and reviewer in determining deficiencies or identifying good practice in an FEA; it is not a substitute for technical qualifications. 17. Key Words 18. Distribution Statement Distribution Unlimited Finite Element Method, Finite Element Analysis, FEA, Available from: Ship Structure, Structural Analysis, Quality National Technical Information Service Assessment, Impact Analysis, Collision Analysis, Springfield, VA 22161 Fracture Analysis, Damage Analysis, Fatigue Analysis, Whole Ship Analysis, Vibration Analysis 19. Security Classlf. (of this report) 20. Security Classification (of this page) 21. No. of Pages 22. Price Unclassified Unclassified 404 Contents PROJECT OVERVIEW ................................................................................................... 1 1/1 EXECUTIVE SUMMARY .......................................................................................... 1 1/2 INTRODUCTION ...................................................................................................... 1 1/2.1 Background .......................................................................................................... 1 1/2.2 Scope ................................................................................................................... 2 1/2.3 Overview of Report .............................................................................................. 2 1/2.4 About the Guidelines ........................................................................................... 4 1/2.5 Using the Guidelines ............................................................................................ 4 1/2.6 The Guidelines as Quality Procedures ................................................................ 4 1/2.7 Where to Get Further Information ........................................................................ 5 ASSESSMENT METHODOLOGY FOR FINITE ELEMENT ANALYSIS ...................... 2-1 GUIDELINES FOR ASSESSING FINITE ELEMENT MODELS AND RESULTS ........... 3-1 3/1 PRELIMINARY CHECKS ...................................................................................... 3-1 3/1.1 Documentation Requirements .......................................................................... 3-1 3/1.2 Job Specification Requirements ....................................................................... 3-4 3/1.3 Finite Element Software Requirements ............................................................ 3-5 3/1.4 Personnel Qualification Requirements ............................................................. 3-8 3/2 ENGINEERING MODEL CHECKS ..................................................................... 3-10 3/2.1 Analysis Type ................................................................................................. 3-10 3/2.2 Analysis Geometry .......................................................................................... 3-16 3/2.3 Material Properties .......................................................................................... 3-25 3/2.4 Loads and Boundary Conditions .................................................................... 3-31 3/2.5 Impact/Collision Analysis ................................................................................ 3-32 3/2.6 Fatigue and Fracture Analysis .....................................................................
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