１引言真实应力与应变的关系（即Ｓ－ε）表现了金属材料的流动应力变化规律，对研究塑性成形问题是必不可少的。而金属材料热加工真实应力的确切计算，目前尚无有实用价值的理论解［２］，普遍采用实验研究的方法。用外推法求压缩真实应力—应变曲线是消除压缩试验接触表... 1 INTRODUCTION The relationship between true stress and strain (ie, S-ε) shows the variation of flow stress in metallic materials and is indispensable to the research of plastic forming. The actual calculation of the thermal stress of metal materials, there is no practical value of the theoretical solution [2], the widespread use of experimental research methods. Extrapolation method for compressing real stress-strain curve is to eliminate compression test contact table ...