Low-cycle fatigue behavior and damage mechanism of AH36 steel based on a continuum damage coupled unified elastoplastic model

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-03-09 DOI:10.1016/j.ijfatigue.2025.108927

Yaping Liu , Yu Qi , Haipeng Cao , Yongbo Shao , Xudong Gao , Wentao He

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Abstract

This paper aims to investigate the fatigue behavior and damage mechanism of AH36 steel under low-cycle fatigue (LCF) loading by a combined experimental and numerical approach. Systemic monotonic tensile and cyclic loading tests with different loading protocols are conducted to calibrate and determine the elastic and plastic model parameters, and to explore cyclic stress–strain response as well as LCF damage behavior. A continuum damage coupled unified elastoplastic model based on the continuum damage mechanics is proposed to describe the hysteresis behavior and fatigue characteristic of AH36 steel; meanwhile, a procedure is developed by the VUMAT subroutine in ABAQUS/Explicit to numerically evaluate the fatigue damage evolution and lifetime prediction throughout the whole fatigue process. Fatigue damage accumulation and stress redistribution within the structure are conducted to clarify damage initiation and evolution process until structural failure. Reasonably good agreement is achieved when comparing the cyclic stress–strain response and stress peak between experimental measurements and numerical simulation, and lifetime prediction indicates better accuracy with an average error of less than 10%.

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基于连续损伤耦合统一弹塑性模型的AH36钢低周疲劳行为及损伤机理

采用实验与数值相结合的方法研究AH36钢在低周疲劳载荷下的疲劳行为及损伤机理。进行了不同加载方案的系统单调拉伸和循环加载试验，以校准和确定弹性和塑性模型参数，并探索循环应力-应变响应和LCF损伤行为。提出了基于连续损伤力学的连续损伤耦合统一弹塑性模型来描述AH36钢的滞回行为和疲劳特性；同时，利用ABAQUS/Explicit中的VUMAT子程序开发了一个数值计算疲劳损伤演化和寿命预测的程序。通过疲劳损伤积累和结构内部应力重分布来阐明损伤的产生和演化过程，直至结构失效。实验测量值与数值模拟值的循环应力-应变响应和应力峰值比较吻合较好，寿命预测精度较好，平均误差小于10%。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.