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发表于 2014-1-8 13:59:19
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引用一段最近看的资料给大侠吧,俺只能说,这是目前老外流行的一个观点。
Fatigue is a cumulative process, which may or may not result in a failure. Fatigue progresses through 3 stages. The first is called the crack nucleation stage. Every product made from virtually every material has tiny defects that are virtually undetectable by inspection. (After all, no part is ever completely perfect.) These defects could be voids or inclusions in the base metal, tiny scratches, cracks, or burrs from machining or forming processes, etc. After a series of cycles of stress application, the defect may develop into a tiny crack. Sometimes, even a sharp notch or corner in a highly stressed area on a part can concentrate enough stress to generate a minute crack at the tip.
附上谷哥的翻译,俺懒一回。
疲劳是一个累积的过程,这可能会或可能不会导致故障。疲劳过程通过3个阶段。首先是所谓的裂纹萌生阶段。从几乎每一个材料制成的每一个产品都有微小的缺陷是通过检查几乎检测不到。 (毕竟,没有任何部分曾经是完全完美的。)这些缺陷可能是在基体金属,微小的划痕,裂纹,或加工毛刺或成形工艺等空洞或夹杂物经过一系列的应激应用周期,缺陷有可能发展成一个微小的裂缝。有时候,在上一部分的高应力区域甚至是尖锐的缺口或角落可以集中足够的应力产生在尖端微小裂纹。 |
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