拉-扭复合疲劳加载作用下薄壁钢圆管裂纹扩展机理

doi:10.13229/j.cnki.jdxbgxb.20231432

摘要/Abstract

摘要：

针对开裂薄壁钢圆管在拉-扭复合疲劳加载作用下的寿命评估问题，本文进行了裂纹扩展机理的研究。首先，基于最大周向应力准则和Paris公式，建立拉-扭双轴比例同相循环荷载下预裂薄壁钢圆管的裂纹扩展分析模型；其次，基于既有疲劳试验，联合采用有限元软件ANSYS和FRANC3D的交互技术，模拟钢圆管裂纹扩展行为，验证本文复合型裂纹扩展分析模型；最后，基于有限元模型，对剪-拉应力比、径厚比、初始损伤尺寸等因素进行参数分析。结果表明：本文所提分析模型可准确预测拉-扭复合疲劳加载作用下薄壁钢圆管（径厚比超过10）的裂纹扩展行为；在拉-扭同相比例疲劳加载情况下，薄壁钢管复合型裂纹很快退化为张开型（Ⅰ型）裂纹，且裂纹扩展角度由最大名义剪-拉应力比决定；在最大主拉应力、应力比相同及小范围屈服条件下，剪-拉应力比和初始损伤长度是影响钢管复合型裂纹扩展行为的主要因素。

关键词: 拉-扭复合疲劳, 薄壁钢圆管, 裂纹扩展, 同相比例循环加载, 剪-拉应力比

Abstract:

To address the problem of life assessment for thin-walled cracked steel circular tube under tension-torsion composite fatigue loading， this paper conducts a study on the fatigue crack propagation mechanism. Firstly， based on the maximum circumferential stress criterion and the Paris equation， a analysis model for crack propagation of pre-cracked thin-walled steel circular tube subjected to tension-torsion biaxial proportional in-phase cyclic loading is established. Secondly， based on existing fatigue tests， the interactive techniques of finite element software ANSYS and FRANC3D is jointly used to simulate the crack propagation behavior of steel circular tube， validate this paper's proposed composite crack propagation analysis model. Finally， based on the finite element model， parameter analyses are conducted on factors such as shear-to-tensile stress ratio， diameter-to-thickness ratio， and initial damage size. The results demonstrate that this paper's proposed analysis model accurately predicts crack propagation behavior of thin-walled steel circular tube （with diameter-to-thickness ratios exceeding 10） under tension-torsion composite fatigue loading. Under tension-torsion in-phase proportional fatigue loading conditions， the composite cracks in thin-walled steel tubes quickly evolve into opening-mode （Mode I） cracks， with the crack propagation angle determined by the maximum nominal shear-to-tensile stress ratio. The shear-to-tension stress ratio and initial damage length were identified as the primary factors on the composite crack propagation behavior of the steel circular tubes under small-scale yield condition with the identical maximum principal tensile stress and stress ratio.

Key words: tension-torsion composite fatigue, thin-walled steel circular tube, crack propagation, in-phase proportional cyclic loading, shear-to-tension stress ratio

中图分类号:

TU391

叶华文,邓加林,冯志皓,杨喆,潘威洲. 拉-扭复合疲劳加载作用下薄壁钢圆管裂纹扩展机理[J]. 吉林大学学报(工学版), 2025, 55(10): 3253-3261.

Hua-wen YE,Jia-lin DENG,Zhi-hao FENG,Zhe YANG,Wei-zhou PAN. Fatigue crack propagation mechanism of thin-walled steel circular tube under tension-torsion proportional mixed mode loading[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(10): 3253-3261.

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