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首页> 外文期刊>Fatigue & fracture of engineering materials and structures >Analysis on peculiar fatigue fracture behaviour of shot peened metal using new threshold stress intensity factor range equation
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Analysis on peculiar fatigue fracture behaviour of shot peened metal using new threshold stress intensity factor range equation

机译：采用新阈值应力强度因子范围路程分析射击喷丸金属的特殊疲劳断裂行为

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摘要

A shot-peened specimen with a precrack exhibits the following peculiar fatigue fracture behaviour. (1) Precracks can be rendered harmless by peening, even though the precrack reduced the fatigue limit by approximately 20%-60% of the nonpeened specimen. (2) When shot-peened specimens were fractured at a higher stress than the fatigue limit, most specimens were fractured from outside the precracked part. (3) In most run-out specimens, stage Ⅱ (tensile type) nonpropagating cracks were observed. Why were nonpropagating cracks initiated and arrested? To explain the above fatigue behaviours, a new threshold stress intensity factor range (ΔK_(th)~R) equation is necessary. In this paper, a ΔK_(th)~R equation as a function of crack size was proposed using a nonlinear zone size criterion. By using the equation, the above peculiar fatigue fracture behaviours (1) and (2) and the stage Ⅱ nonpropagating crack arrest condition could be evaluated quantitatively. Stage Ⅱ nonpropagating crack initiation could be explained by considering the microdistribution of residual stress due to peening.
机译：带有预碎片的射击喷丸样品表现出以下特殊的疲劳骨折行为。 （1）Premrack可以通过喷丸使造成的无害，即使预防次数将疲劳极限降低约20％-60％的不纯化标本。 （2）当射击喷丸样品在比疲劳极限的较高应力下断裂时，大多数样本都从预粘的部分外部裂缝。 （3）在大多数输出​​标本中，观察到Ⅱ期（拉伸型）非突译裂缝。为什么非正式裂缝发起和被捕？为了解释上述疲劳行为，需要新的阈值应力强度因子范围（ΔK_（Th）〜R）方程。在本文中，使用非线性区尺寸标准提出了作为裂纹尺寸函数的ΔK___（TH）〜R方程。通过使用等式，可以定量评估上述特殊的疲劳断裂行为（1）和（2）和Ⅱ期非突出裂缝阻滞病症。可以通过考虑由于喷丸引起的残余应力的微调来解释Ⅱ期非突译裂纹启动。

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