Abstract
Dependence on mesh orientation impacts adversely the quality of computational solutions generated by cohesive zone models. For instance, when considering crack propagation along interfaces between finite elements of 4k structured meshes, both extension of crack length and crack angle are biased according to the mesh configuration. To address mesh orientation dependence in 4k structured meshes and to avoid undesirable crack patterns, we propose the use of nodal perturbation (NP) and edge-swap (ES) topological operation. To this effect, the topological data structure TopS (Int. J. Numer. Meth. Engng 2005; 64: 1529-1556), based on topological entities (node, element, vertex, edge and facet), is utilized so that it is possible to access adjacency information and to manage a consistent data structure in time proportional to the number of retrieved entities. In particular, the data structure allows the ES operation to be done in constant time. Three representative dynamic fracture examples using ES and NP operators are provided: crack propagation in the compact compression specimen, local branching instability, and fragmentation. These examples illustrate the features of the present computational framework in simulating a range of physical phenomena associated with cracking.
Original language | English (US) |
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Pages (from-to) | 1303-1343 |
Number of pages | 41 |
Journal | International Journal for Numerical Methods in Engineering |
Volume | 84 |
Issue number | 11 |
DOIs | |
State | Published - Dec 2010 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Numerical Analysis
- General Engineering
- Applied Mathematics
Keywords
- 4k mesh
- Dynamic fracture
- Edge-swap
- Extrinsic cohesive zone model
- Nodal perturbation
- PPR
- Potential-based model
- Topological data structure