Composite Structures: Process Analysis, Progressive Damage, Failure Analysis, and Advanced Software - Online Short Course (May 13-16, 2024) 13 May - 16 May 2024 Online

Basics:

• Introduction to the types of aerospace composites; length scales
• Stress-strain relationships for isotropic and transversely isotropic solids
• Concentric cylinder model (CCM) results as a building block for tape laminates and tows in textile composites,
• Reduction of 3D stress-strain relations to plane stress-strain relations for a lamina
• Classical lamination theory
• Thermal and hygrothermal stresses in lamina and laminates
• CHILE model for curing of thermoset matrix simulation

• Introduction to damage and failure in composites
• Lamina/laminate-based failure initiation theories
• Schapery theory for a damaging lamina; obtaining Schapery parameters from tests
• Crack band theory for post-peak response of a lamina and handling mesh objectivity
• Basic fracture mechanics in terms of modes I, II and III for interlaminar failure

• Finite element method as a means to solving the 3D equations of continuum solid mechanics
• Fiber-matrix micromechanics simulations for obtaining effective properties; periodic boundary conditions.
• Application of the finite element method to modeling tape laminates and textile composites
• Various aspects of FEA: Explicit/implicit, mass scaling, element types
• Traction separation laws and their embedment in finite element applications
• All of the topics will be supplemented by examples and when necessary, the use of software to obtain solutions to progressive damage and failure of tape laminates and textile composites.

COURSE DELIVERY AND MATERIALS

• The course classes will be held via Zoom. You can test your connection here: https://zoom.us/test
• Access to the Zoom classroom will be provided to registrants near to the course start date.
• Any slides will be available for download. No part of these materials may be reproduced, distributed, or transmitted, unless for course participants. All
• rights reserved.
• Between lectures, the instructor will be available via email for technical questions and comments.
• Attendees will use Digital Blue (DB) software associated with the modeling framework to run several examples. The DB software works as a plug-in with the commercially available ABAQUS finite element software package. Therefore, participants must have access to ABAQUS. hose who have DB licenses for the plug-in will be able to run the examples in real time. Others who have access only to ABAQUS, will be provided with the Zoom demonstration of the examples that require DB software. All participants will receive an ABAQUS .odb file of all examples for processing results.

Anthony M. Waas

Anthony M. Waas is the Felix Pawlowski Collegiate Chair, Emeritus, in Aerospace Engineering at the University of Michigan. He is also a Professor of Mechanical Engineering, Emeritus and Adjunct Professor of Aerospace Engineering, from January 1, 2024, at the Uniersity of Michigan. Effective Jan 1, 2024 he assumed the role of Director of the School for Engineering of Matter, Transport and Energy (SEMTE) at Arizona State University. Prior to that he was the Richard A. Auhll Department Chair (2018-2023), and Boeing Egtvedt Endowed Chair Professor and Department Chair in the William E. Boeing, and Department of Aeronautics and Astronautics at the University of Washington (UW), Seattle (2015-2018). His current research interests are: robotically manufactured lightweight structures, including in-space manufactured structures, computational modeling of composite aerostructures, 3D printed lightweight structures, damage tolerance of composite structures, affordable textile composites, hydrogen storage for mobility, and data science applications in modeling of materials and structures.

Professor Waas was the Director, Composite Structures Laboratory at the University of Michigan, from 2018-2023 & 1988 to 2014, prior to joining UW in January 2015. Professor Waas is a Fellow of the American Institute of Aeronautics and Astronautics (AIAA), the American Society of Mechanical Engineering (ASME), the American Society for Composites (ASC), the American Academy of Mechanics (AAM) and the Royal Aeronautical Society, UK. He is a recipient of several best paper awards, the 2016 AIAA/ASME SDM award, the AAM Jr. Research Award, the ASC Outstanding Researcher Award, and several distinguished awards from the University of Michigan, including the Stephen S. Attwood award for Excellence in Engineering, one of the highest honors for an Engineering faculty member at the University of Michigan. He received the AIAA-ASME-ASC James H. Starnes, jr. Award, 2017, for seminal contributions to composite structures and materials, and for mentoring students and other young professionals. In 2017, Professor Waas was elected to the Washington State Academy of Sciences, and in 2018 to the European Academy of Sciences and Arts. He is the recipient of the AIAA ICME Prize, 2020, the ASME Warner T. Koiter Medal, 2020, the ASME/Boeing Structures & Materials Award, 2020, and the AIAA Dryden Lecture in Research, presented at the International Scitech Conference, 2022. Recently, Prof. Waas was elected to the US National Academy of Engineering - Aeronautics and Space Engineering Board and was awarded the CT Sun Medal, American Society of Composites, 2023.
 

Royan D’Mello, Founding Partner, Digital Blue

Dr. Royan Dmello is an Assistant Research Scientist in the Aerospace Engineering Department at the University of Michigan – Ann Arbor. He obtained his Ph. D. in Aerospace Engineering from the University of Michigan in 2014 for thesis on composite honeycomb structures for energy absorption applications. He also has a master’s in Civil Engineering (Structures) from the University of Michigan. He is currently working on modeling cure response and failure in composite pressure vessels for automotive applications and also development of fatigue modeling framework for of composite pressure vessels. He is also working on finite element failure modeling and fatigue modeling of composite textiles using progressive damage analysis methods. He was part of the team that received the American Institute of Aeronautics & Astronautics’ 2020 ICME Prize. He was a Research Associate in the William E. Boeing Department of Aeronautics & Astronautics at the University of Washington – Seattle (2015 – 2019). Apart from process modeling, he has extensive background in mechanics of energy absorbing structures (such as foams and honeycombs), stability analysis of structures as well as using micromechanics of composite materials.


Minh Hoang Nguyen, Founding Partner, Digital Blue

Dr. Minh Hoang Nguyen is currently a Postdoctoral Research Fellow at the Department of Aerospace Engineering of the University of Michigan, specifically at the Composite Structures Laboratory led by Prof. Waas. He received his BSc in Mechanical Engineering and MSc in Aeronautics from the Technical University of Berlin (TU Berlin). Dr. Nguyen completed his PhD at the University of Michigan under the supervision of Prof. Waas with the thesis titled “A novel computational framework for high-fidelity probabilistic progressive failure analysis of composite laminates”. His research interests primarily focus on fiber-reinforced polymer composites, involving both experimental and computational methods. His current projects deal with progressive damage and failure analysis via finite element methods (FEM) including probabilistic modeling and process-induced residual stresses. He led the technical development of the Digital Blue virtual testing software. Dr. Nguyen also has experience with toughened aerospace composite materials, automated fiber placement (AFP) manufacturing and studied the effects of defects. Furthermore, Dr. Nguyen is also passionate about teaching and supervising undergraduate and graduate students. He is a recipient of the ASME/Boeing Structures & Materials Award in 2020.