拉伸法测杨氏模量中的横梁形变对实验的影响

The Influence of Bean Deformation on Young's Module Experiment through Stretching Method

拉伸法测定金属的杨氏模量实验中,一般采用光杠杆测量出细丝因受拉力而产生的微小伸长量,测出的金属丝微小形变量是否精准决定了这个实验精确度。光杠杆测量出细丝因受拉力而产生的微小伸长量理应该包括了横梁弯曲的形变量。为减小横梁形变带来的影响,提高拉伸法测杨氏模量的实验精度,可从对金属丝的形变量进行修正和改变横梁结构两方面着手。

In the Young’s module experiment, when we test metal through stretching method, we usually test the tiny elongation of the metal filament through optical lever, and thus the accuracy of the experiment is decided by the accuracy of the filament ’s deformation quantity which must be considered in this experiment. To reduce the negative influence of bean deformation and improve the accuracy of the experiment, we can start with correcting the deformation of the metal filament and changing the structure for bean.