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

NIU Xiao-dong 1,LU Li-rong 2,YUAN Xiao-yan 1,GUO Jia-tai 1(1.Department of Physics,Changzhi Medical College,Changzhi,Shanxi 046000,China;2.Department of Bio-Medical Engineering,Changzhi Medical College,Changzhi,Shanxi 046000,Chian)  
In the experiment measuring materials of Young's modulus using stretched method,its diameter gradually 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.
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