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Journal of Composite Materials
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A Mechanical Model of 3D Braided Composites with Internal Transverse Crack

Tao Zeng

Applied Science Institute, Harbin University of Science and Technology, 150001, Harbin, PR China, taozeng{at}sohu.com

Linzhi Wu

Center for Composite Materials, Harbin Institute of Technology, 150001, Harbin, PR China

Licheng Guo

Center for Composite Materials, Harbin Institute of Technology, 150001, Harbin, PR China

Li Ma

Center for Composite Materials, Harbin Institute of Technology, 150001, Harbin, PR China

A laminated mechanical model has been developed that can predict the mechanical properties of 3D braided composites with internal transverse crack. By using the principle of minimum complementary energy, the stress components are obtained in closed-form expressions in terms of a perturbation function, which is governed by two fourth-order inhomogeneous ordinary differential equations. The effective Young’s modulus and Poisson’s ratio of 3D braided composites with internal crack are calculated using the homogenization theorem. To demonstrate the solution, some examples are analyzed. Good agreement is obtained between the presented results and the values predicted by the modified finite element method.

Key Words: 3D braided composites • variational solution • mechanical property • internal crack

Journal of Composite Materials, Vol. 39, No. 4, 301-321 (2005)
DOI: 10.1177/0021998305046451
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