本文从试件能容承的应变能观点出发,论证了全过程试验对试验装置的刚度要求。指出需要的试验装置刚度不仅与试件的刚度有关,而且还要考虑允许试件变形速度在整个试验过程中的均匀性,任何有限刚度的“刚性试验机”,均不可能做到全过程应力应变曲线具有等变形速度的性质。 In this paper, from the standpoint of the strain energy that the specimen can accommodate, the requirement of the rigidity of the test device in the whole process test is demonstrated. It is pointed out that the required test device stiffness is not only related to the stiffness of the test piece, but also to consider the uniformity of the allowable deformation speed of the test piece during the entire test process. No “rigidity test machine” with limited stiffness can achieve full process stress. The strain curve has the property of equal deformation speed.