Fatigue tests on a plain woven glass composite at room temperature under biaxial (tension/torsion) loading were conducted. Nonlinear stress-strain (S-S) response especially in shear, was found and focused. Under pulsating shear stress loading, the S-S relation during loading periods became linear just before final failure, while the unloading S-S curve kept its nonlinear relation. According to the cyclic stress profile, the S-S curve was much affected and changed. It was found that preferential cracks due to the shear stress component occurred and might affect the fatigue failure as well as the nonlinear stress-strain response.

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