X型圆钢管相贯节点超低周疲劳裂纹萌生寿命预测

王旭东; 黄政华; 韩涵

doi:10.13204/j.gyjzG21070802

X型圆钢管相贯节点超低周疲劳裂纹萌生寿命预测

doi: 10.13204/j.gyjzG21070802

贵州大学土木工程学院, 贵阳 550025

基金项目:

国家自然科学基金项目(51368009)

贵州省科技计划项目(黔科合基础[2018]1036)。

详细信息

作者简介:
王旭东,男,1997年出生,硕士研究生。

通讯作者:
黄政华,zhhuang@gzu.edu.cn。

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- 文章访问数: 97
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-08
- 网络出版日期: 2022-07-23
- 刊出日期: 2022-07-23

Prediction of Fatigue Crack Initiation Life of Unstiffened CHS Steel Tube X-Joints Under Quasi-Static Loading

School of Civil Engineering, Guizhou University, Guiyang 550025, China

摘要

摘要: 为获得X型圆钢管相贯节点的超低周疲劳裂纹萌生寿命,对9个不同几何参数的X型圆钢管相贯节点进行数值模拟分析。采用钢材混合强化模型和循环孔穴增长模型(CVGM)对X型圆钢管相贯节点进行有限元分析,并运用ABAQUS子程序预测节点在不同等幅往复荷载作用下的超低周疲劳裂纹萌生寿命;根据正交设计试验理论,对X型圆钢管相贯节点的疲劳裂纹萌生寿命影响因素——支管与主管管径比β、主管径厚比γ进行参数化分析。研究结果表明:β越小,X型圆钢管相贯节点的裂纹萌生寿命越大;γ越大,X型圆钢管相贯节点的裂纹萌生寿命越大。最后基于裂纹萌生寿命的参数化分析结果,提出预测X型圆钢管相贯节点超低周疲劳裂纹萌生寿命的经验公式。
- X型圆钢管相贯节点 /
- 参数化分析 /
- 微观机制模型 /
- 正交设计 /
- 疲劳裂纹萌生寿命
Abstract: To obtain the fatigue crack initiation life of unstiffened CHS X-joints under quasi-static loading, nine groups of unstiffened joints with different geometric parameters were numerically simulated. The hybrid strengthening model of steel and the cyclic hole growth model (CVGM) were used to predict the fatigue crack initiation life of unstiffened X-joints under quasi-static loading and various equal amplitude reciprocating loads. According to the orthogonal design test theory, parametric analysis was carried out on the influencing factors of fatigue crack initiation life (diameter ratio of branch pipe to main pipe β, diameter-thickness ratio of main pipe γ) of unstiffened X-joints. The results showed that the larger the diameter ratio of branch pipe to main pipe, the smaller the crack initiation life of unstiffened X-joints. The larger the diameter-thickness ratio of the main pipe, the longer the crack initiation life of the unstiffened X-joints is. Finally, based on the parametric analysis results of crack initiation life, an empirical formula for predicting the fatigue crack initiation life of unstiffened X-joints under quasi-static loading was proposed.
- unstiffened CHS X-joints /
- parametric analysis /
- micromechanical models /
- orthogonal design /
- fatigue crack initiation life

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