A Critical Evaluation of Computational Fracture Using a Smeared Crack Approach in MPM

Author

Jason Sanchez

Publication Date

2-9-2011

Abstract

An evaluation of the smeared crack representation of material failure using the material-point method (MPM) as a feasible computational failure approach is performed. The spatial descretization in MPM is defined by a grid of cells that represent space and a set of points that represent the deformable solid. A grid orientation bias in the numerical results is demonstrated. Solution accuracy is lost when failure surface and grid line orientations are not aligned. Causes of the grid orientation dependence are identified, but the problem remains unresolved. Limited use of the smeared crack approach in MPM for solving problems of material failure is advised.

Keywords

Computational Fracture, Material-point method, MPM, de-cohesion, smeared crack

Degree Name

Mechanical Engineering

Level of Degree

Doctoral

Department Name

Mechanical Engineering

First Committee Member (Chair)

Schreyer, Howard

Second Committee Member

Sulsky, Deborah

Third Committee Member

Yu-Lin, Shen

Document Type

Dissertation

Language

English

Recommended Citation

Sanchez, Jason. "A Critical Evaluation of Computational Fracture Using a Smeared Crack Approach in MPM." (2011). https://digitalrepository.unm.edu/me_etds/8