Nonlinear Meshfree Analysis Program (NMAP) Version 1.0 (User's Manual)

As a part of the meshfree method development for fragment-impact modeling, an enhanced semi-Lagrangian reproducing kernel particle method formulation for modeling large material deformation and damage mechanisms was developed. The formulation includes a microcrack-informed damage model (MIDM) for improved material failure modeling. The MIDM is based on multiscale homogenization using the energy bridging theory pertinent to fragment penetration modeling of concrete materials. Enhanced kernel contact algorithms to model multi-body contact applicable to penetration problems were also developed. The computational formulations and numerical algorithms for these new meshfree method developments were implemented into the parallel Nonlinear Meshfree Analysis Program (NMAP) code. This report provides user instructions for building and running a model in NMAP. The report, together with previously published technical reports, also provides a general overview of the theoretical foundation of the newly developed meshfree formulation for fragment-impact modeling. Prepared in cooperation with the Department of Civil and Environmental Engineering, University of California, Los Angeles. The original document contains color images.