A ghost-stabilised material point method for large deformation geotechnical analysis

Coombs, W.M.

Abstract

The Material Point Method (MPM) is advertised as the method for large deformation analysis of geotechnical problems. However, the method suffers from several instabilities which are widely documented in the literature, such as: material points crossing between elements, different number of points when projecting quantities between the grid and points, etc. A key issue that has received relatively little attention in the literature is the conditioning of the linear system of equations due to the arbitrary nature of the interaction between the physical body (represented by material points) and the background grid (used to solve the governing equations). This arbitrary interaction can cause significant issues when solving the linear system, making some systems unsolvable or causing them to predict spurious results. This paper presents a cut-FEM (Finite Element Method) inspired ghost-stabilised MPM that removes this issue.

Citation

Coombs, W. (2023, June). A ghost-stabilised material point method for large deformation geotechnical analysis. Presented at 10th European Conference on Numerical Methods in Geotechnical Engineering, London

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 10th European Conference on Numerical Methods in Geotechnical Engineering
• Start Date: Jun 26, 2023
• End Date: Jun 28, 2023
• Publication Date: 2023
• Deposit Date: Jul 5, 2023
• Publicly Available Date: Jul 5, 2023
• DOI: https://doi.org/10.53243/numge2023-57
• Public URL: https://durham-repository.worktribe.com/output/1134050
• Related Public URLs: https://www.issmge.org/uploads/publications/51/119/NUMGE2023-57.pdf