Modified single fiber fragmentation test procedure to study water degradation of the fiber/matrix interface toughness of glass/vinylester
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A modified single fiber fragmentation test (SFFT) procedure, that permits separation of the fiber break and fiber/matrix (F/M) debond propagation events, was employed to characterize the (F/M) interface toughness of dry and water saturated E-glass/vinylester. By focusing solely on the debond propagation event, and by measuring the critical load for debond propagation, fracture mechanic analysis enabled determination of the fracture toughness of the fiber/matrix interface. After immersion in seawater, the interface was substantially degraded. The fracture toughness was reduced by approximately a factor of two.
KeywordsFracture Toughness Energy Release Rate Fiber Fracture Interface Shear Strength Fiber Break
The authors acknowledge the support for this work at Florida Atlantic University from ONR grant No. N00014-05-1-0341 managed by Dr. Yapa Rajapakse. Thanks are due to Shawn Pennell for the art work.
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