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Journal of Composite Materials
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Application of a First Invariant Strain Criterion for Matrix Failure in Composite Materials

R. Li

D. Kelly

School of Mechanical and Manufacturing Engineering University of New South Wales, Sydney 2052, AustraliaD.kelly{at}unsw.edu.au

R. Ness

Cooperative Research Centre for Advanced Composite Structures Ltd Fishermans Bend, 3207, Australia

This paper reports an application of the strain invariant failure theory (SIFT) proposed by Gosse to through-thickness failure of composite structures [Gosse, J.H. and Christensen, S. (2001). Strain Invariant Failure Criteria for Polymers in Composite Materials, AIAA-2001-1184]. It includes global 3D finite element analysis on a ply-by-ply basis and the determination of amplification factors for strains in the intrafiber resin and the calculation of thermal residual strain due to manufacturing for intrafiber resin using micromechanical models. The new procedure has been applied to matrix failures for one type of curved beam, two types of I-beam and two types of T-cleat structures. The resulting predictions of the failure loads for both the I-beams and the T-cleats follow experimental trends. The limiting value of the first invariant strain for failure of the resin in the unidirectional tape is 17,000–20,000 ", and in the bidirectional fabric is 26,000–27,000 ".

Key Words: composite materials • failure prediction • resin matrix • strain invariant • thermal residual stress

Journal of Composite Materials, Vol. 37, No. 22, 1977-2000 (2003)
DOI: 10.1177/0021998303036268
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J. H. Oh, K. K. Jin, and S. K. Ha
Interfacial Strain Distribution of a Unidirectional Composite with Randomly Distributed Fibers under Transverse Loading
Journal of Composite Materials, May 1, 2006; 40(9): 759 - 778.
[Abstract] [PDF]