含表面裂纹焊接结构疲劳评定的质量等级方法

doi:10.3901/JME.2018.14.082

机械工程学报 ›› 2018, Vol. 54 ›› Issue (14): 82-89.doi: 10.3901/JME.2018.14.082

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含表面裂纹焊接结构疲劳评定的质量等级方法

杨建国^1,2, 郝建松¹, 李曰兵^1,2, 郑文健¹, 高增梁^1,2, 张鹏程¹

1. 浙江工业大学化工机械设计研究所杭州 310032;
2. 浙江工业大学过程装备及其再制造教育部工程研究中心杭州 310032

收稿日期:2017-11-08 修回日期:2018-04-02 出版日期:2018-07-20 发布日期:2018-07-20
通讯作者: 李曰兵(通信作者),男,1987年出生,博士,讲师。主要研究方向为含缺陷结构的完整性评定。E-mail:ybli@zjut.edu.cn
作者简介:杨建国,男,1975年出生,博士,教授,博士研究生导师。主要从事焊接结构力学与可靠性、焊接变形控制等方面的研究工作,发表论文100余篇。E-mail:yangjg@zjut.edu.cn
基金资助:
国家重点研发计划（2016YFC0801905）和国家自然科学基金（51605435）资助项目。

Quality Category Approach of Fatigue Assessment for Welded Structures with Surface Cracks

YANG Jianguo^1,2, HAO Jiansong¹, LI Yuebing^1,2, ZHENG Wenjian¹, GAO Zengliang^1,2, ZHANG Pengcheng¹

1. Institute of Process Equipment & Control Engineering, Zhejiang University of Technology, Hangzhou 310032;
2. Engineering Research Center of Process Equipment and Re-manufacturing of Ministry of Education, Zhejiang University of Technology, Hangzhou 310032

Received:2017-11-08 Revised:2018-04-02 Online:2018-07-20 Published:2018-07-20

摘要/Abstract

摘要： 针对含裂纹焊接结构的疲劳评定，基于断裂力学的传统方法依据Paris公式需多次迭代计算估计结构寿命，计算量较大、耗时较长，不便于对工程问题做出及时快速决策。通过含裂纹结构疲劳强度与S-N曲线的等效关系，建立含裂纹结构的质量等级方法，实现快速疲劳评定。针对无限长裂纹，推导计算出与S-N曲线对应的含无限长裂纹结构质量等级，确定不同质量等级下无限长裂纹的允许深度。进而，针对有限尺寸裂纹进行疲劳裂纹扩展分析计算，基于等疲劳强度和等疲劳寿命建立无限长裂纹的等效方法，获得有限尺寸裂纹对应的等效无限长裂纹深度。以轴向载荷下含表面裂纹板为对象，采用该方法计算出一系列板厚下不同质量等级的无限长裂纹允许深度，以及不同裂纹形状比的等效无限长裂纹深度，形成裂纹尺寸等效图和无限长裂纹质量等级图。采用该方法对一典型含裂纹结构进行疲劳评定，并与基于断裂力学的传统方法进行比较，验证了质量等级方法的可行性。研究方法将有助于质量等级方法在含裂纹结构疲劳评估中推广应用，对实现含裂纹设备疲劳寿命的快速评估具有重要意义。

关键词: 表面裂纹, 焊接结构, 疲劳评定, 质量等级

Abstract: For fatigue assessment of welded structures contained cracks, fatigue life is calculated by multiple iterations according to Paris law based on traditional fracture mechanics, which will take much time due to the large computation and affect the strategy fast-making. Quality category approach for structures contained cracks is established to achieve rapid fatigue assessment by the equivalent relationship between fatigue strength and S-N curves. The quality category approach for structures contained extended cracks is deduced, which is corresponding to S-N curves. The allowable depth of extended crack at different quality categories is calculated. As for the fatigue propagation analysis for certain size cracks, the depths of equivalent extended cracks corresponding to certain size cracks are calculated based on the equivalent method of the equivalent fatigue strength and equivalent fatigue life. Taken semielliptical surface cracks under the axial stress as a study object, the allowable depths of extended cracks at different quality categories and thicknesses of steel plates are calculated based on the equivalent methods. The equivalent crack size diagram and the quality category diagram of extended cracks are drawn by the calculated depths of extended cracks for different crack shape ratios. Compared with the traditional method based on fracture mechanics, the equivalent method is used to evaluate fatigue of structures contained cracks for the excellent feasibility. The study will contribute to the popularization and application of the quality category approach for fatigue assessment of structures contained cracks, which is of significance to achieve the quick assessment for equipment contained cracks.

Key words: fatigue assessment, quality category, surface cracks, welded structures*

中图分类号:

TH49
TG405

杨建国, 郝建松, 李曰兵, 郑文健, 高增梁, 张鹏程. 含表面裂纹焊接结构疲劳评定的质量等级方法[J]. 机械工程学报, 2018, 54(14): 82-89.

YANG Jianguo, HAO Jiansong, LI Yuebing, ZHENG Wenjian, GAO Zengliang, ZHANG Pengcheng. Quality Category Approach of Fatigue Assessment for Welded Structures with Surface Cracks[J]. Journal of Mechanical Engineering, 2018, 54(14): 82-89.

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含表面裂纹焊接结构疲劳评定的质量等级方法

Quality Category Approach of Fatigue Assessment for Welded Structures with Surface Cracks

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