具有内表面裂纹高压厚壁圆管的疲劳寿命分析

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Analysis of Fatigue Life of Thick-Wall Cylinder with Inner Surface Crack Subjected to High Pressure

1. Southwest Jiaotong University, Chengdu, 610031, China;
2. Ningbo Sub-academy, National Ordnance Science Research Academy, Ningbo, Jiangsu, 315103, China

摘要: 从K_I的基本表达式出发,利用Schmitt-Keim影响系数并考虑压力介质的影响,对两支具有初始裂纹的模拟管进行了K_I计算。计算K_I达到K_Ic的裂纹深度,与实验一致。本文将Paris方程作为厚壁圆管内表面裂纹扩展速率模型并给出方程系数,计算结果与实验结果相吻合。在此基础上计算了实验模拟管的疲劳寿命,给出了压力-疲劳寿命关系曲线。不失一般性,给出具有内表面裂纹高压厚壁圆管的疲劳寿命保守计算。
- 厚壁圆管 /
- 表面裂纹 /
- 疲劳寿命
Abstract: Based on the basic formulation of K_I and using Schmitt-Keim coefficient and considering the effects of the pressure medium,the K_I of two thick-wall simulated tubes with initial cracks had been calcu-lated and the calculative results were agreed with the tests.The Paris equation was used as the model of crack growth rate and its coefficients were given in this paper.The fatigue lives of the thick-wall simulated tubes were calculated and the relative curves of fatigue life with pressure were obtained.For generality,the formulations for conservative calculations of the fatigue life of thick-wall tube with inner surface crack were pro-posed and can be used to estimate the fatigue life of thick-wall tube.
- Thick-wall cylinder /
- Surface crack /
- Fatigue life