The progressive nature of fatigue damage due to cyclic loading on glass fiber reinforced plastics was studied. The residual strength of the specimens subjected to fluctuating tension with a given number of cycles was measured, and the number of cracks developed in the samples were counted by means of a microscope. From our test results, the progression process of fatigue damage in the composite materials can be divided into three stages.
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J. K. Kim et al.Abstract-A round-robin test programme has been carried out to characterise the mode I interlaminar fracture behaviour of E-glass woven fabric reinforced vinyl ester matrix composites. Special emphasis has been placed on the effect of silane coupling agent on the stability of interlaminar crack propagation and fracture toughness. Sixteen laboratories participated in this programme. Each laboratory was supplied with composite laminates of thicknesses of its own choice and conducted the tests according to its own procedures. The results showed that variations in interlaminar fracture toughness between laboratories were very large in spite of slight differences in the test procedures used, such as specimen dimensions, test speed and data reduction schemes. Nevertheless, the general trends were clearly identified with respect to different silane coupling agents. Other observations and the implications are discussed.
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