###

←前一篇   |   后一篇→

(四川大学 制造科学与工程学院, 四川 成都 610065)
Study on Residual Life of Pressure Vessels with Immerged Cracks Based on Defect Security Attenuation Path Simulation
(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)

Abstract:The study of crack propagation is the key and foundation of pressure vessels' residual life prediction. In view of security assessment for pressure vessels with immerged cracks, based on the security attenuation path simulation, another calculation method is put forward to predict the residual life. First of all, the iterative calculation based on Paris fatigue crack growth formula is conducted to build the model of geometric correlation change in crack length and depth. Next, this correlation model is used to simulate the security attenuation path track of immersed crack defects in R6 evaluation diagram. The immersed crack change represented by path track can be divided into immersed crack phase and surface crack phase. Then the numerical integration method is adopted to get the residual track segment of security attenuation path in different phases, and the calculation model of immersed crack safety margin is built. This calculation model can show related dynamic safety margins for different sizes of crack defect, and reflect the safety degree of pressure vessels. After building the mechanical model of pressure vessels' crack defect, the stress intensity factor of special crack point in finite element method is calculated. And weight function method is adopted to get the function formula of the stress intensity factor range K of crack defect. The function formula of fatigue circulation time N is calculate by Paris formula integral. Lastly, according to the model of geometric correlation change in crack length and depth, the fatigue circulation times of immersed cracks is calculated by means of integration.
keywords:

 作者 单位 E-mail 龙伟 四川大学 制造科学与工程学院, 四川 成都 610065 严佳兵 四川大学 制造科学与工程学院, 四川 成都 610065 李炎炎 四川大学 制造科学与工程学院, 四川 成都 610065 lyy_scu@163.com 刘华国 四川大学 制造科学与工程学院, 四川 成都 610065 黄吉民 四川大学 制造科学与工程学院, 四川 成都 610065

LONG Wei,YAN Jiabing,LI Yanyan,LIU Huoguo,HUANG Jimin.Study on Residual Life of Pressure Vessels with Immerged Cracks Based on Defect Security Attenuation Path Simulation[J].Advanced Engineering Sciences,2018,50(5):239-243.