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| Stress intensity factor of angular crack in double slot circular section pipe |
| Received:October 08, 2019 Revised:December 11, 2019 |
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| DOI：10.7511/jslx20191008005 |
| KeyWord:double groove circular section tube corner crack stress intensity factor conservation law supplementary equation |
| Author | Institution |
| 胡思雅 |
辽宁石油化工大学 机械工程学院, 抚顺 |
| 谢禹钧 |
辽宁石油化工大学 机械工程学院, 抚顺 |
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| Abstract: |
| There are two different singular stress fields and corresponding stress intensity factors for the corner crack of a circular tube with double grooves under bending loads.In this paper,a simple and practical method for determining the stress intensity factor of the crack of the irregularly-shaped thin-walled tube is proposed.That is to say,the contribution of stress intensity factor to J2 integral is found by using conservation law,by choosing an appropriate three-dimensional integral path and combining with the calculation method of stress and displacement in elementary mechanics,and an equation for determining stress intensity factor is established.Because the equation is not enough to determine the two stress intensity factors,a supplementary equation between the stress intensity factors is established by using the assumption that the plane section of the material remains plane.By solving the J2 integral and the supplementary equation together,the stress intensity factor of the corner crack of a double-grooved circular tube under bending load can be obtained.For other irregularly-shaped thin-walled tube cracks,the method is also applicable and the process is simple. |
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