The Interface Crack Behavior in Dissimilar Anisotropic Composites Under Mixed-Mode Loading

1983 ◽  
Vol 50 (1) ◽  
pp. 179-183 ◽  
Author(s):  
S. S. Wang ◽  
I. Choi
Keyword(s):  
Interface Crack ◽  
Mixed Mode ◽  
Approximate Model ◽  
Theoretical Development ◽  
Crack Model ◽  
Mixed Mode Loading ◽  
Intensity Factors ◽  
Crack Behavior ◽  
Interlaminar Crack ◽  
Energy Release Rates

A study of an interlaminar crack between dissimilar, anisotropic composites under mixed-mode loading is presented. Based on the theoretical development in [1], the problem is modeled by using a partially closed interface crack model for the closed tip and an approximate model for the other tip. Solutions are obtained for the interlaminar crack between dissimilar composites with various degrees of anisotropy under general mixed-mode loading conditions. Crack closure, contact stresses, crack-tip stress intensity factors, and energy release rates are determined for each case.

Measurements of Stress Intensity Factors of an Interface Crack Under Mixed Mode Loading

1996 ◽  
Vol 56 (1-4) ◽  
pp. 187-203 ◽  
Author(s):  
H. Y. Ahmad ◽  
M. E. Fitzpatrick ◽  
I. R. Wallhead ◽  
L. Edwards
Keyword(s):  
Stress Intensity ◽  
Interface Crack ◽  
Stress Intensity Factors ◽  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Intensity Factors

The Interface Crack Between Dissimilar Anisotropic Composite Materials

1983 ◽  
Vol 50 (1) ◽  
pp. 169-178 ◽  
Author(s):  
S. S. Wang ◽  
I. Choi
Keyword(s):  
Composite Materials ◽  
Interface Crack ◽  
Hilbert Problem ◽  
Stress Singularity ◽  
Anisotropic Elasticity ◽  
Crack Model ◽  
Closed Crack ◽  
Anisotropic Composite ◽  
Interlaminar Crack ◽  
As Stress

The fundamental nature of an interface crack between dissimilar, strongly anisotropic composite materials under general loading is studied. Based on Lekhnitskii’s stress potentials and anisotropic elasticity theory, the formulation leads to a pair of coupled governing partial differential equations. The case of an interlaminar crack with fully opened surfaces is considered first. The problem is reduced to a Hilbert problem which can be solved in a closed form. Oscillatory stress singularities are observed in the asymptotic solution. To correct this unsatisfactory feature, a partially closed crack model is introduced. Formulation of the problem results in a singular integral equation which is solved numerically. The refined model exhibits an inverse square-root stress singularity for commonly used advanced fiber-reinforced composites such as a graphite-epoxy system. Extremely small contact regions are found for the partially closed interlaminar crack in a tensile field and, therefore, a simplified model is proposed for this situation. Physically meaningful fracture mechanics parameters such as stress intensity factors and energy release rates are defined. Numerical examples for a crack between θ and −θ graphite-epoxy composites are examined and detailed results are given.

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