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mansamsung8113

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[求助] 关于marc中一个关于铜导线的例子

marc中一个例子是这样的,一个铜导线的长度为50m,导线截面近似为半径15mm的圆形.
在建立几何特性时所用的单元为实心梁单元,书中在其截面属性的“diameter”中输入的是“7”,问题就是为什么是7呀?
我的理解是模型长度为50m, 所以“diameter”直径单位也应该为m,即应该添入“0.03”才对啊。
还请各位大侠指点。
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