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自从 Brown 等人提出用悬臂弯曲方法研究金属材料的应力腐蚀开裂性能以来,这种方法被广泛地用来测定金属材料在特定环境介质中的 da/dt 值。由跟踪裂纹在开口处张开位移或力臂位移随时间的变化,通过标定步骤求得裂纹长度 a 随时间的变化,即可计算得到 da/dt 值.跟踪加载点位移的变化是比较方便的,且位移Δ与载荷 P 之比值具有带有裂纹试样的系统的顺性 C 的物理意义。此时必须对加载点顺性进行标定。Fisher 等人首次做了这种标定,但他们没有在试样上接上力臂,故裂纹平面距加载点的距离 L 与试样宽度 W 之比还比较小,且没有得到通过实验点曲线的方程式。后来 Sheinker 等人发表了他们在悬臂弯曲试验机上做的加载点顺性的数据,认
Since Brown et al. Have proposed the cantilever bending method to study the stress corrosion cracking behavior of metallic materials, this method has been widely used to determine the da / dt value of metallic materials in specific environmental media. By tracking the crack opening in the opening or the arm displacement with time, through the calibration step to obtain the crack length a over time, you can calculate the da / dt value. Tracking changes in the loading point of displacement is more convenient , And the ratio of displacement Δ to load P has the physical meaning of the compliance C of the system with cracked specimens. At this point, you must calibrate the loading point. Fisher et al. Did this for the first time, but they did not attach the arm to the specimen, so the ratio of the crack plane L to the loading point W to the specimen width W was still relatively small and did not show any equation. Later, Sheinker et al. Published data on the compliance of loading points on a cantilever bending tester