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【单选题】
一长为 l ,直径为 d 的等截面圆截面轴,两端受到一对大小相等、方向相反的集中力偶作用 M ,材料的切变模量为 G ,则其弹性应变能 Vε 为:
A.
16 M 2 l /( Gπd 4 )
B.
32 M 2 l /( Gπd 4 )
C.
8 M 2 l /( Gπd 4 )
D.
64 M 2 l /( Gπd 4 )
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