Composite material II type crack growth rate measuring method capable of acquiring crack growth S-N curve
A crack growth rate and crack growth technology, which is applied in the measurement of type II crack growth rate of composite materials and in the field of composite material testing, can solve the problems of waste of fatigue test information, failure to meet the requirement of constant fatigue stress level, and complicated test operation procedures, etc.
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[0064] Type II crack growth S-N curve of glass fiber composites and determination method of growth rate.
[0065] 32 samples are randomly selected and numbered, the geometric dimensions are as follows figure 1 shown. Artificial Type I pre-cracking is performed on the sample. First, draw a line at 45mm from the pre-crack end on both sides of the sample; secondly, insert a wedge-shaped blade with a straight front edge into the pre-crack surface along the width direction of the test piece, slowly And push the blade forward horizontally to expand the crack tip by about 5mm. Pull out the PTFE film after crack prefabrication. Load the sample according to the loading method described in step 2 in the "specific implementation method" of this patent application. The test groups and the stress levels of each group are given in Table 1. The observation of cracks during the test is carried out according to step 3 in the "specific implementation method" of this patent application. The...
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