Bounding Surface Approach to the Modeling of Anisotropic Fatigue Damage in Woven Fabric Composites 131
Figure 12. Predictions of the stress strain relationship of
monotonic failure loading and fatigue loadings with stress
ratio 1:1. The experimental data are from the work of
Smith & Pascoe [1].
fatigue life. In this work a bounding surface theory is
presented to predict the fatigue behavior of the woven
material under biaxial loadings. The limit strength state
expressed as a potential damage function is let to soften
(shrink) based on an appropriate rate of a damage vari-
able. The changes of the material properties and the ine-
lastic deformation are also addressed by means of re-
sponse tensors. The forms of response tensors allow the
formulation to predict induced anisotropy due to cracking.
Strength anisotropy is also studied and addressed. By
comparison with experimental data, the model shows
good capability to describe the essential properties of
woven composite materials under biaxial fatigue loading.
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