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International Journal for Multiscale Computational Engineering
Facteur d'impact: 1.016 Facteur d'impact sur 5 ans: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2015014038
pages 475-490

ENERGY-BASED ANALYSIS OF TRANSVERSE CRACKING AND INDUCED DELAMINATION IN [S'/90n/S]s LAMINATES: A VARIATIONAL APPROACH

Ghasem Sadeghi
Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, 424 Hafez Avenue, Iran
H. Hosseini-Toudeshky
Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, 424 Hafez Avenue, Iran

RÉSUMÉ

Analysis of transverse-ply cracking and small delaminations emanating from the tips of transverse cracks is extended to symmetric laminates having more general layup configurations. Almost all studies on induced delamination due to transverse-ply cracking are limited to [S/90n]s laminates, where (S) is any orthotropic sublaminate that is much stiffer than [90n]. In this paper, the evolution of transverse matrix cracking and the induced delamination from it is investigated for laminates with more general layups [S'/90n/S]s. In this configuration, the cracked layer is offset to the midplane of the laminate and is constrained by the two orthotropic sublayers. The micromechanics-based model is developed using a variational approach to find the stress field of a unit-cell in a generalized plane strain condition. A combined analytical/numerical methodology is used to solve the boundary value problem. The total complementary potential energy of the unit-cell is calculated, as is the energy release rate for transverse cracking and induced delamination damage. The calculated energy release rate as a function of crack density and delamination length is obtained for different layup configurations, and in some cases the results are compared with results from the literature. Because the distribution of cracks in a structure is uniform, the results for the unit cell scale can be used for the structural scale.


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