题目内容

对于铸铁圆轴扭转试件的破坏形式及原因是( )。

A. 断裂面垂直于试件轴线,断裂是由该截面拉应力过大引起的。
B. 断裂面垂直于试件轴线,断裂是由该截面剪应力过大引起的。
C. 断裂面与轴线成45º的,断裂是由该截面拉应力过大引起的。
D. 断裂面与轴线成45º的,断裂是由该截面剪力过大引起的。

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对于铸铁拉伸试件的破坏形式及原因是( )。

A. 断裂面垂直于试件轴线,断裂是由该截面拉应力过大引起的。
B. 断裂面垂直于试件轴线,断裂是由该截面剪应力过大引起的。
C. 断裂面与轴线成45º的,断裂是由该截面拉应力过大引起的。
D. 断裂面与轴线成45º的,断裂是由该截面剪力过大引起的。

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