Abstract
Nonlinear stress-strain (S-S) properties of a plain woven glass fabric composite were measured under three different loading paths which gave the same final stress state. Thin-walled tubular specimens were used. In all tests, acoustic emissions (AE) were measured to distinguish damage accumulation such as debonding, matrix cracking and fiber breakage. Internal damage of failed specimens was also examined using an optical microscope. The S-S relations up to failure were affected by the biaxial stress ratio α (the ratio between normal and shear stresses) and loading paths. Both damage accumulation and its sequence were also affected by loading paths. And they were characterized by microphotographs and AEs such as total AE event and primary frequency. However, the strength did not depend on the loading path. The material failure was governed by the final stress condition regardless of the difference of loading path.
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