有一根弹簧实物（材料为304SS）,长度是38mm,最大直径是11.7mm,线径是1.7mm,每一圈的距离是5.5mm,要把它的高度垂直挤压到17mm,请计算需要多少牛的力?
F=f*G*d^4/(8*n*D^3)
F：压力,N
f：变形量,mm
G：材料的切变模量,MPa
d：钢丝直径,mm
n：弹簧有效圈数
D：弹簧中径,mm 关于G,一般碳素弹簧钢丝取79000. 304,G=71000.
F=f*G*d^4/(8*n*D^3)
=(38-17)*71000*1.7^4/(8*38/5.5*10^3)
=225.3(N)
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