This is an introductory level class for those who are interested in using LS-DYNA® for material failure analysis.
This course focuses on modeling material failure phenomena using generalized finite element and meshless methods for industrial applications, such as electronics, aerospace, automotive, manufacturing, civil, medical, defense, sports, and consumer products. Outstanding examples include, but are not limited to, material failure in electronic packaging, crashworthiness, turbine engine safety, bird strike, joining and assembly processes, drop tests, and metal fabrication. We will discuss a wide range of natural and man-made materials, such as metal alloy, glass, plastic, foam, composite (laminate, fiber reinforced), and concrete.
The failure processes to be modeled span from low speed deformation to high strain rate dynamic response, such as ductile and brittle failure, crack propagation, delamination (in laminates) and fragmentation. To better capture the physics in these processes, material separation is carefully treated through various approximation schemes rather than the element/material deletion technique applied with the traditional finite element method. Thus, conservation laws are satisfied and reliable force responses and physical deformation modes can be obtained. Several generalized finite element and meshfree methods and their corresponding LS-DYNA keywords will be introduced. The basics of pre- and post- processing procedures will also be introduced in the class through in-class workshops.
Smoothed Particle Galerkin (SPG) Method
Ductile failure in destructive manufacturing
Blanking, cutting, drilling, grinding, self-piercing riveting, flow drill screwing
Ductile and semi-brittle failure in impact penetration and perforation
Impact on metal and concrete targets
Strength analysis of various joints such as SPR joints and spot welds
Brittle failure in isotropic brittle material
Glass fracture, impact on windshield
Delamination and in-plane failure in UD composite laminates
Smoothed Particle Hydrodynamics (SPH)
Impact and penetration
eXtended Finite Element Method (XFEM)
Ductile failure (crack propagation) in shell structures