Higher order adaptively integrated cohesive element

Conference paper (2020)

Authors

R. Russo Student
B. Y. Chen Aerospace Structures & Computational Mechanics - Aerospace Engineering
Research Group
Aerospace Structures & Computational Mechanics (Aerospace Engineering) (TU Delft)
Copyright: © 2020 R. Russo, B. Y. Chen
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Published Date

2020

Language

English

Reuse Rights

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Aerospace Structures & Computational Mechanics

Abstract

Cohesive Element (CE) is a well-established finite element for fracture, widely used for the modelling of delamination in composites. However, the computational time of CE-based method is prohibitive. This is because the steep and non-smooth stress gradient in the cohesive zone requires a very fine mesh. In this context, a new type of CE is here proposed, aiming to loosen the mesh constraint and reduce the computational time. It uses a higher-order interpolation of the displacement field with rotational degree of freedom and an adaptive integration scheme based on the status of the element. The proposed CE has been validated through comparison with benchmark solutions of delamination in Mode I, Mode II and Mixed-Mode cases, and has demonstrated superior performance than standard CE in computational efficiency while retaining a high level of accuracy.

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