Permanent set strength and Proof strength, plastic extension strength of aluminum alloy were tested by means of uniaxial tensile test.The results show that permanent set strength and proof strength,plastic extension are two different mechanical properties, but the difference is small.Generally,the difference ratio is within 1%,except only a few more than 1%.%通过单轴拉伸试验测定铝合金规定残余延伸强度与规定塑性延伸强度.结果表明,规定残余延伸强度与规定塑性延伸强度是两种力学性能,两个值相差的比例不大,一般来说都在±1%以内,只有极少数超过±1%.
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