A New Interaction Algorithm with Erosion for EPIC-3
Abstract
This report documents modifications which were incorporated in the EPIC-3 (5, 6) computer program (Elastic-Plastic Impact Computations in Three Dimensions) in order to treat impact and penetration with erosion. EPIC-3 is a finite element program with explicit time integration which is primarily intended for simulation of solids to short intense loads, such as in impact or explosive detonations. A variety of material laws including elastic-plastic solids, concrete/geological materials and explosives are included. As part of this modification, two major features were added: 1. a hexahedral element with one-point quadrature and hourglass control; 2. An algorithm for treating projectile-target interaction in situations where material erosion can occur arbitrarily in the target or projectile. A key attribute of the interaction algorithm is that it requires no definition or tracking of sliding interfaces. Instead, the interaction is handled by operations on slave nodes and master elements. Because of this feature of the algorithm, the erosion of an element requires no redefinition of the interface and thus avoids the complexity associated with sliding interfaces in these situations. The hexahedral element was incorporated primarily because it simplifies the new interaction algorithm. However, it also increases the speed of the computer program and avoids the excessive stiffness of the tetrahedra. Solutions are presented for three projectile penetration problems, ranging from a simple problem primarily intended to verify the computer code to a large-scale problem involving erosion of both the projectile and target.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1985
- Accession Number
- ADA153654
Entities
People
- J. I. Lin
- T. Belytschko