Advances and Challenges in Computational Modeling of Dynamic Material Failure: From Single to Multi-Scale Simulations and Their Industrial Applications

Date: 
Wednesday, February 6, 2019 - 2:00pm
Location: 
3110 Etcheverry Hall
Speaker: 
Dr. C.T. Wu

Senior Scientist
Livermore Software Technology Corporation (LSTC)

About: 

Numerical modeling of material failure remains a formidable challenge to the computational mechanics community. Apparently, the pure continuum-based numerical methods are not able to accurately predict the material failure takes place at the finer scale. In other words, the C1-continuity assumption in most finite element methods is inadequate to describe the kinematic discontinuity of displacement fields at the macro-scale for material separation analysis. In this talk, three numerical methods exhibiting strong displacement discontinuity for single-scale material failure analysis are introduced to bypass the numerical limitations of conventional finite element methods. Smoothed Particle Galerkin (SPG) method, Peridynamics and Extended Finite Element Method (XFEM) are presented to model fracture in solid, composite and shell respectively. On the other hand, while most multi-scale methods are focused on the models of intact materials, their application in material failure analysis is very rare and has become an emergent need for industrial applications. In contrast to the single-scale approach, the multi-scale approach encompasses the material failure modeling with better scale information and relevant physics. In this talk two multi-scale methods are introduced to model the material failure in specific industrial applications such as the joint failure in crashworthiness and the failure in composite materials.

Biography: 

Dr. C.T. Wu is a senior scientist leading a research group at Livermore Software Technology Corporation (LSTC). LSTC with its major product LS-DYNA is one of the most widely used commercial software in the automotive, aerospace and defense industries to analyze vehicle, aircraft and weapon system designs.

 

Dr. Wu received his PhD degree in Mechanical Engineering from the University of Iowa in 1999 and was an Assistant Professor at same school between 1999~2001. Dr. Wu joined LSTC in 2001. Since that, he has published over sixty peer-reviewed journal articles with more than three thousand citations in the Goggle Scholar. He was awarded seven US patents for their novelties in computational technology. Dr. Wu serves as the editorial board member in several international journals and is a technical reviewer for more than forty journals and publishers. He is also a member of USACM and IACM.

 

Hosted by: Professor Tarek Zohdi, 6117 Etcheverry Hall, 510- 642-9172, zohdi@berkeley.edu