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引用一段最近看的資料給大俠吧，俺只能說，這是目前老外流行的一個(gè)觀點(diǎn)。
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.
附上谷哥的翻譯，俺懶一回。
疲勞是一個(gè)累積的過程，這可能會(huì)或可能不會(huì)導(dǎo)致故障。疲勞過程通過3個(gè)階段。首先是所謂的裂紋萌生階段。從幾乎每一個(gè)材料制成的每一個(gè)產(chǎn)品都有微小的缺陷是通過檢查幾乎檢測不到。 （畢竟，沒有任何部分曾經(jīng)是完全完美的。）這些缺陷可能是在基體金屬，微小的劃痕，裂紋，或加工毛刺或成形工藝等空洞或夾雜物經(jīng)過一系列的應(yīng)激應(yīng)用周期，缺陷有可能發(fā)展成一個(gè)微小的裂縫。有時(shí)候，在上一部分的高應(yīng)力區(qū)域甚至是尖銳的缺口或角落可以集中足夠的應(yīng)力產(chǎn)生在尖端微小裂紋。 |
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樓主: angel1399793
發(fā)表于 2014-1-8 08:07:29
