A microstructurally-sensitive damage model considering grain boundary effect under fatigue and creep-fatigue interaction

IF 12.8 1区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Plasticity Pub Date : 2025-09-19 DOI:10.1016/j.ijplas.2025.104484

Kai Song , Lianyong Xu , Lei Zhao , Yongdian Han , Bo Xiao , Ninshu Ma

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Abstract

A microstructurally-sensitive damage model was developed to predict fatigue/creep-fatigue crack behaviors and rupture lives. The microstructurally-sensitive damage model consisted of a modified creep void model, a modified fatigue slip band model, and a creep-fatigue interaction model. In the modified creep void model, the nucleation and coalescence of creep voids were controlled by the grain boundary angle and stress-strain condition. The modified full-scale fatigue slip band model considered the contribution of creep damage on multiple grain boundaries. Furthermore, a novel parameter was introduced to unify the effects of plastic strain and temperatures of different materials on the crack propagation. Creep-fatigue interaction was considered through creep void and fatigue crack. The simulated crack behavior matched well with the experimental data, and the predicted rupture lives fell within the ±1.7 error band. The results exhibited that it was an efficient tool for predicting crack behavior under complex fatigue and creep-fatigue loading conditions.

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考虑疲劳和蠕变-疲劳相互作用晶界效应的微结构敏感损伤模型

建立了一种微结构敏感损伤模型，用于预测疲劳/蠕变疲劳裂纹行为和断裂寿命。微结构敏感损伤模型包括修正蠕变空洞模型、修正疲劳滑移带模型和蠕变-疲劳相互作用模型。在修正的蠕变空洞模型中，蠕变空洞的形核和聚并受晶界角和应力-应变条件的控制。修正的全尺寸疲劳滑移带模型考虑了蠕变损伤在多晶界上的贡献。此外，还引入了一个新的参数来统一不同材料的塑性应变和温度对裂纹扩展的影响。从蠕变空洞和疲劳裂纹两方面考虑蠕变-疲劳相互作用。模拟的裂纹行为与实验数据吻合较好，预测的断裂寿命在±1.7误差范围内。结果表明，它是预测复杂疲劳和蠕变疲劳载荷条件下裂纹行为的有效工具。

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来源期刊

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

CiteScore

15.30

自引率

26.50%

发文量

256

审稿时长

46 days

期刊介绍： International Journal of Plasticity aims to present original research encompassing all facets of plastic deformation, damage, and fracture behavior in both isotropic and anisotropic solids. This includes exploring the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena. Topics of interest span the plastic behavior of single crystals and polycrystalline metals, ceramics, rocks, soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films, and polymers. Additionally, the journal covers plasticity aspects of failure and fracture mechanics. Contributions involving significant experimental, numerical, or theoretical advancements that enhance the understanding of the plastic behavior of solids are particularly valued. Papers addressing the modeling of finite nonlinear elastic deformation, bearing similarities to the modeling of plastic deformation, are also welcomed.