泊松比对拉伸法测材料杨氏模量的影响

Effect of Poisson's ratio on experiment of measuring Young's modulus of materials using stretched method

用拉伸法测杨氏模量较小的圆形材料杨氏模量实验时,伴随材料的拉长,其直径将明显减小.此时,实验必须考虑材料直径的变化.以拉伸法测圆形硅胶的杨氏模量为例,将材料直径的变化通过泊松比转为材料伸长量,实验结果表明引入泊松比所测杨氏模量精确度提高,不确定度减小.

In the experiment measuring materials of Young＇s modulus using stretched method, its diametergradually decreases along with the length of it gradually stretches, so one needs to consider this problem. Taking the measurement of Young＇s modulus of the silica gel as an example, we convert the change of its diameter to its elongation. The experimental results of introducing Poisson＇s ratio show that the uncertainty decreases and the accuracy is improved.