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为解决多数实验室不具备δ5专用夹式引伸计而无法实现δ5间接测量法对裂纹尖端张开角CTOA的测试问题,该文另辟蹊径借鉴直接法测试CTOA中的数值图像相关方法,通过工业摄像机采集试样撕裂过程图像,然后在图像上直接测试δ5和裂纹扩展量Δa,进而求得裂纹尖端张开角CTOA。采用该方法重点测试3件X80管线钢试样的稳态裂纹扩展阶段临界CTOA值(CTOA)c,并依据试验断裂形式从原理上分析试验结果的有效性,确认被测X80管线钢的(CTOA)c为10.32°。
In order to solve the problem that the δ5 indirect measurement method does not have the δ5 special clip extensometer to test the crack tip opening angle CTOA, this paper tries to use the direct method to test the numerical image correlation method in the CTOA, and collects the sample through the industrial camera Tearing the process image, and then directly on the image δ5 and crack growth Δa, and then crack tip opening angle CTOA. The critical CTOA value (CTOA) c of steady-state crack propagation in three X80 pipeline steel samples was mainly tested by this method. The validity of the test results was analyzed according to the experimental fracture form, and the CTOA ) c is 10.32 °.