材料性能试验总延伸率的可比性

Comparablity of Wkole Extensibility on Material Property Testing

金属材料的总延伸率δ是很重要的性能参数.但在单向拉伸试验中,由于试样原始标距不同,所获得的总延我早率也不同.此文讨论了不同原始标距时,总延伸率δ的可比性问题,推导出了理论换算公式,并以实验结果加以验证.

Percentage elongation of metal materials is a very important parameter. In unigxial stretching test,the measured value of elongation varies with different original gauge length. In this paper,the comparability of different values of elongation with corressponding original gauge length is discussed and calculation formula is deduled and varified by experiment.