Journal
JOURNAL OF AEROSPACE ENGINEERING
Volume 24, Issue 2, Pages 170-180Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)AS.1943-5525.0000029
Keywords
Two-dimensional triaxially braided composite; Unit cell; Progressive degradation; Cohesive; Debonding; Straight-sided specimen test
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A new three-dimensional finite-element model of two-dimensional, triaxially braided composites is presented in this paper. This mesoscale modeling technique is used to examine and predict the deformation and damage observed in tests of straight-sided specimens. A unit cell-based approach is used to consider the braiding architecture and the mechanical properties of the fiber tows, the matrix, and the fiber tow-matrix interface. A 0 degrees/ +/- 60 braiding configuration has been investigated by conducting static finite-element analyses. Failure initiation and progressive degradation has been simulated in the fiber tows by using the Hashin failure criteria and a damage evolution law. The fiber tow-matrix interface was modeled by using a cohesive zone approach to capture any fiber-matrix debonding. By comparing the analytical results with those obtained experimentally, the applicability of the developed model was assessed and the failure process was investigated. DOI: 10.1061/(ASCE)AS.1943-5525.0000029. (C) 2011 American Society of Civil Engineers.
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