本文依据测定金属拉伸试样断后伸长率的移位法,应用试样拉伸时其体积不变原理,导出了试样断后长度的移位换算公式,因其原理与移位法相同,故称这种方法为移位换算法。试验证明,所得的公式是可靠的。试验时,根据试样的断裂位置不同,应用公式即可求得试样断后伸长率的准确值。 In this paper, according to the shift method for determining the elongation after metal tensile test, the principle of displacement is deduced based on the principle of constant volume when the sample is stretched. Because of the same principle and shift method, Therefore, this method is called shift conversion method. Experiments show that the formula obtained is reliable. Test, according to the different position of the specimen fracture, the formula can be obtained after the specimen elongation after fracture the exact value.