An efficient approach to the modeling of compressive transverse cracking in composite laminates

A wedge-shaped failure mechanism occurs when a composite ply in a laminate is loaded under transverse compression. Therefore failure models developed for tension are not straightforwardly applicable to compression. For models that represent matrix cracks as discontinuities, the inclined crack topolo...

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Bibliographic Details
Published in:Composite structures 2015-09, Vol.128, p.115-121
Main Authors: Steenstra, W., van der Meer, F.P., Sluys, L.J.
Format: Article
Language:English
Subjects:
Approximation
Cohesion
Cohesive law
Compressing
Compression
Extended finite element method
Failure
Fracture mechanics
Interface elements
Laminates
Planes
Progressive failure analysis
Topology
Transverse cracking
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Summary:A wedge-shaped failure mechanism occurs when a composite ply in a laminate is loaded under transverse compression. Therefore failure models developed for tension are not straightforwardly applicable to compression. For models that represent matrix cracks as discontinuities, the inclined crack topology complicates algorithms considerably. In this paper, a method is introduced to approximate the behavior of inclined cracks while avoiding these complications. Rather than adapting the crack topology, a transformation is applied in the evaluation of the cohesive law. The method is applied on predefined interface elements in a 2D model, as well as on cohesive segments in the extended finite element method in a 3D model. It is found that the compressive failure of composite laminates including the wedge effect can be approximated accurately with this method using a vertical crack plane. In 3D, a variable fracture plane angle is taken into account with the method, which means that the whole range of failure modes, from tensile through shear-dominated to compressive failure can be covered in a single approach.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2015.03.035