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本文根据平面应力试样在测定R曲线试验中是否需要进行疲劳预制裂纹的不同评价,对三种铝合金薄板分别制成的人工切口和疲劳裂纹试样进行了试验,结果表明人工切口试样较疲劳裂纹试样高估了材料的裂纹扩展阻力。
According to the different evaluation of the flat stress specimen in determining the R curve test whether the fatigue prefabricated crack need to be made, the artificial notch and the fatigue crack specimen made from the three kinds of aluminum alloy sheets are respectively tested. The results show that the artificial notch specimen Fatigue cracked specimens overestimated the crack propagation resistance of the material.