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Delamination analysis of a layered elastic-plastic beam

Victor Rizov (University of Architecture, Civil Engineering and Geodesy, Sofia, Bulgaria)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 2 October 2017

52

Abstract

Purpose

The purpose of this paper is to perform a theoretical analysis of delamination fracture behaviour of the Crack Lap Shear layered beam configuration taking into account the material non-linearity. A delamination crack located arbitrarily along the beam height was considered in this study.

Design/methodology/approach

The beam mechanical behaviour was described by using the Ramberg-Osgood stress-strain relation. Fracture was analysed by applying the J-integral approach. Besides by using symmetric Ramberg-Osgood stress-strain curve, fracture was investigated also by Ramberg-Osgood stress-strain curve that is not symmetric with respect to tension and compression. The J-integral solutions were verified by performing elastic-plastic analyses of the strain energy release rate.

Findings

The effects of crack location and material properties on the non-linear fracture behaviour were evaluated. It was found that the material non-linearity leads to increase of the J-integral values. Therefore, the material non-linearity has to be taken into account in fracture mechanics based safety design of structural members composed by layered materials. The analytical solutions derived are very useful for parametric investigations of delamination fracture with considering the material non-linearity. The results obtained can be applied for optimisation of the beam structure with respect to fracture performance.

Originality/value

The present study contributes for the understanding of delamination fracture in layered beams that exhibit non-linear material behaviour.

Keywords

Acknowledgements

The present study is supported financially by the Research and Design Centre (CNIP) of the UACEG, Sofia (Contract BN – 189/2016).

Citation

Rizov, V. (2017), "Delamination analysis of a layered elastic-plastic beam", International Journal of Structural Integrity, Vol. 8 No. 5, pp. 516-529. https://doi.org/10.1108/IJSI-11-2016-0035

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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