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14对于没有明显屈服极限的塑性材料,通常以产生02%的( )所对应的应力作为屈服极限。

单选题
2021-09-08 14:07
A、)
B、)
C、)
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B

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以下有四种说法:1将某塑性材料预拉到强化阶段后进行卸载、再重新加载的过程能使材料的弹性极限得到提高,这一过程也被称为冷作硬化。 2铸铁是脆性材料,在拉伸时的应力-应变曲线中没有屈服阶段,而在拉断时的应力就是衡量它强度的指标,称作强度极限。 3通常情况下,可把低碳钢看作拉、压性能相同的材料,工程上既能用于受拉构件又能用于受压构件。而铸铁在工程上是一种抗压性能好而抗拉性能差的材料,因此一般只用于受压构件。 4对于塑性材料,取其屈服极限作为极限应力,而对于脆性材料,则取强度极限作为极限应力。 其中正确说法的个数有几个?
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使材料丧失正常工作能力的应力称为极限应力。工程上一般把__________作为塑性材料的极限应力;对于脆性材料,则把________作为极限应力
( )是指常温下把材料预拉到塑性变形,然后卸载,当再次加载时,将使材料的屈服极限提高而塑性降低的现象。
14对于没有明显屈服极限的塑性材料,通常以产生02%的( )所对应的应力作为屈服极限。
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以下材料哪些没有明显屈服阶段,得不到屈服点,但断裂后具有较大的塑性变形?()
对于没有明显屈服极限的塑性材料,通常以产生0.2%的()所对应的应力作为屈服极限。
对于许多没有明显屈服现象的金属材料,工程上规定以试样产生()塑性变形时的应力,作为该材料的屈服点。
青铜、硬铝、中碳钢大都没有明显的屈服阶段,工程上规定这类材料在产生()的塑性应变时,所对应的应力为屈服应力。
对于没有明显屈服点的材料,通常规定产生()的残余变形时的应力,作为屈服强度。
极限应力是指使材料丧失工作能力时的应力,理想弹塑性材料的极限应力是屈服极限。( )
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