Damage Evolution Model Considering Fatigue Failure Factor Under Multiaxial Non-Proportional Loading

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Experimental Techniques Pub Date : 2024-04-04 DOI:10.1007/s40799-024-00706-z

Z. Ren, X. Qin, Q. Zhang, Y. Sun

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Abstract

The Chaudonneret model cannot fully and effectively characterize the linear correlation between the strain energy density release rate and the number of cycles in the damage evolution stage of low carbon alloy steels under multiaxial non-proportional loading. In order to solve this problem, the fatigue failure process of Q355B is captured by digital image correlation technology, and the factors affecting fatigue failure under multiaxial loading are analyzed in combination with fracture morphology characteristics. Based on the concept of critical plane, a new stress combination form is introduced to reflect the failure factors, and the corresponding damage evolution model is proposed. The model considers the interaction between different stresses and can describe the damage evolution law under non-proportional loading. Compared with different types of life prediction models, the distribution range of life prediction results of the improved model under multiaxial non-proportional loading has a good correlation with the experimental values.

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考虑多轴非比例载荷下疲劳破坏因子的损伤演变模型

Chaudonneret模型无法全面有效地表征多轴非比例加载下低碳合金钢损伤演化阶段应变能密度释放率与循环次数之间的线性相关关系。为了解决这一问题，利用数字图像相关技术捕捉了 Q355B 的疲劳破坏过程，并结合断口形貌特征分析了多轴加载下疲劳破坏的影响因素。在临界面概念的基础上，引入了新的应力组合形式来反映失效因素，并提出了相应的损伤演化模型。该模型考虑了不同应力之间的相互作用，能够描述非比例加载下的损伤演化规律。与不同类型的寿命预测模型相比，改进模型在多轴非比例加载下的寿命预测结果分布范围与实验值具有良好的相关性。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.