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首页> 外文期刊>Journal of thermal stresses >CRACK ARREST ANALYSIS UNDER CYCLIC THERMAL SHOCK FOR AN INNER-SURFACE CIRCUMFERENTIAL CRACK IN A FINITE-LENGTH THICK-WALLED CYLINDER
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CRACK ARREST ANALYSIS UNDER CYCLIC THERMAL SHOCK FOR AN INNER-SURFACE CIRCUMFERENTIAL CRACK IN A FINITE-LENGTH THICK-WALLED CYLINDER

机译：有限长厚壁圆筒内周向裂纹在循环热冲击下的裂纹抑制分析

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摘要

This article presents a crack arrest depth analysis under cyclic thermal shock for an inner-surface circumferential crack in a finite-length thick-walled cylinder with rotation-restrained edges. The inside of the cylinder is cooled from a uniform temperature distribution. The effects of heat transfer conditions on the maximum transient stress intensity factor for the problem were investigated with systematical evaluation methods formerly developed. Then, under an assumption of a tentative threshold stress intensity range ΔK_(th) together with the Paris law, the crack arrest depth under cyclic thermal stress was evaluated. The results suggested the existence of an upper limit for the normalized crack arrest depth, independent of the cylinder material in an engineering sense. Finally, the validity of applying ΔK_(max) ≤ ΔK_(th) as a crack arrest criterion under cyclic thermal shock was confirmed by fatigue tests under mechanical loads equivalent to those induced by cyclic thermal shock.
机译：这篇文章提出了在循环热冲击下，具有有限旋转边的有限长厚壁圆筒内表面圆周裂纹的止裂深度分析。气缸内部从均匀的温度分布中冷却。用以前开发的系统评价方法研究了传热条件对最大瞬态应力强度因子的影响。然后，在暂定阈值应力强度范围ΔK_（th）与巴黎定律一起的假设下，评估了循环热应力下的裂纹止裂深度。结果表明，在工程意义上，归一化的止裂深度存在上限，与圆柱体材料无关。最后，通过在与循环热冲击相同的机械载荷下进行疲劳试验，确认了在循环热冲击下应用ΔK_（max）≤ΔK_（th）作为裂纹止裂准则的有效性。

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