题目内容

塑性材料在对称循环变应力下的极限应力为( )。

A. σ s
B. σ B
C. σ 0
D. σ -1

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零件的截面形状一定,当截面尺寸增大时,其疲劳极限值将随之()

A. 变大
B. 变小
C. 不变

在载荷和几何形状相同的情况下,钢制零件间的接触应力与铸铁零件间的接触应力相比()

A. 较高
B. 较低
C. 相同

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