Method for measuring high-temperature creep crack growth threshold value of material
A technology of crack growth and high temperature creep, which is applied in the test field of high temperature prestressed creep crack growth test to determine the threshold value of creep crack growth, and achieves the effects of high cost, promotion of crack growth and reduction of test cost
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[0026] like figure 1 Shown, the specific implementation steps of the present invention are as follows:
[0027] 1. Processing specimens: For the specific materials studied, process a batch (at least 6 pieces) of standard compact tension (CT) specimens according to the requirements of the creep crack growth test. The initial incision height is 2 mm; the initial incision length is 0.45 times the width of the test piece; the surface of the test piece is first polished with 300-grit sandpaper and then with 2000-grit fine sandpaper to make the surface roughness and finish as high as possible so that the crack propagation path can be observed. Process a batch (at least 6 pieces) of wedges with different thicknesses. The thickness of the wedges starts from 2.1mm. The thickness difference between the wedges is 0.05mm. The width of the wedges is consistent with the width of the test piece. The distance to the left side of the specimen is 2mm larger.
[0028] 2. Prefabricated cracks: ...
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