A summary of benchmark examples to assess the performance of quasi-static delamination propagation prediction capabilities in finite element codes

Abstract

The development and application of benchmark examples for the assessment of quasi-static delamination propagation capabilities is demonstrated. The methodology proposed, based on fracture mechanics, is used to develop benchmarks for the double cantilever beam, end-notched flexure, single leg bending as well as mixed-mode bending specimens for 20%, 50% and 80% mode II. The methodology proposed for the development of quasi-static benchmark results is discussed in detail, and will be presented using the double cantilever beam specimen as an example. The practical application of the benchmarks generated is illustrated by using the double cantilever beam and mixed-mode bending (50% mode II) benchmarks to assess the automated procedure implemented in Abaqus/Standard®. This assessment proved to be valuable by highlighting the issues (e.g. overshooting, saw-tooth behavior, non-convergence) associated with choosing the input parameters unique to the Virtual Crack Closure Technique implementation in Abaqus/Standard®. Additional studies should include the assessment of the propagation capabilities in more complex specimens and on a structural level.