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Journal of Composite Materials
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0021998306061320v1
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Article

Discrete Cohesive Zone Model to Simulate Static Fracture in 2D Triaxially Braided Carbon Fiber Composites

De Xie1, Amit G. Salvi1, Ce Sun1, Anthony M Waas1*, Ari Caliskan2

1 Department of Aerospace Engineering, The University of Michigan, Ann Arbor, MI 48109-2140, USA
2 Vehicle Design R&A Department, Ford Motor Company, Dearborn, MI 48121, USA

* To whom correspondence should be addressed.


  Abstract

A discrete cohesive zone model (DCZM) is implemented to simulate the mode I fracture of two dimensional triaxially braided carbon (2DTBC) fiber composites. The 2DTBC is modeled as an elastic-one-parameter (a 66) plastic continuum. The plastic behavior of the 2DTBC was characterized by measuring a 66. Mode I fracture tests are carried out by using a modified single edge notch bend (SENB) configuration. Fracture toughness (G IC) as a function of crack extension is measured by a compliance approach. The fracture tests are then simulated by using the DCZM based interface element in conjunction with the commercial software ABAQUS® through a user subroutine UEL. The simulated results, carried out under conditions of plane stress, are compared with the experimental results and also verified for mesh sensitivity. The results presented provide guidelines and a basic understanding to model structural response of non-homogeneous materials, incorporating fracture as a damage mechanism and using constituent level material properties, geometry, and fracture toughness (G IC) as input.

Key Words: textile braided composite, crack growth, cohesive zone model, discrete cohesive zone model

First published on March 23, 2006, doi:10.1177/0021998306061320

Journal of Composite Materials 2006;40:2025.

A more recent version of this article appeared on November 1, 2006

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