基于塑性蠕变分离应变分析的铝合金疲劳损伤规律推导

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-08 DOI:10.1016/j.ijfatigue.2025.108964

Towa Hayashibe , Ken-ichi Ohguchi , Katsuhiko Sasaki , Kohei Fukuchi , Shinya Honda , Yorimasa Tsubota , Takuro Mita , Wataru Nagai , Kouji Ohsato , Nobuaki Shinya

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引用次数: 0

摘要

用于汽车发动机部件的铝（Al）合金在超过其熔化温度Tm 1/2的高温下承受疲劳载荷。由于蠕变发生在1/2Tm的疲劳过程中，因此必须采用同时考虑塑性变形和蠕变影响的方法来评估疲劳损伤。本文首次将塑性-蠕变分离方法应用于低周疲劳载荷下的铸造铝合金，推导了考虑塑性和蠕变损伤对疲劳寿命影响的疲劳损伤规律。由于铝合金发动机部件在室温到1/2Tm以上的循环变化温度下使用，因此采用温度相关参数的循环热载荷使疲劳损伤规律适应于疲劳寿命。最后，将疲劳损伤规律应用于再现发动机真实使用状态的热机械疲劳（TMF）试验的疲劳寿命评价。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Derivation of fatigue damage law for an aluminum alloy based on plastic-creep separation strain analysis

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Derivation of fatigue damage law for an aluminum alloy based on plastic-creep separation strain analysis

Aluminum (Al) alloys used for automobile engine components are subjected to fatigue loading at high temperatures over 1/2 of their melting temperatures

T_{m}

. The fatigue damage must be evaluated by a method that considers the effect of both the plastic and creep deformations because creep deformation occurs in the fatigue process at 1/2

T_{m}

. In this paper, the plastic-creep separation method is first applied to a casting Al alloy subjected to low cycle fatigue (LCF) loading, and a fatigue damage law is derived considering the effect of the plastic and creep damages on the fatigue life. Since Al alloy engine components are used at cyclically changing temperatures from room temperature to over 1/2

T_{m}

, the fatigue damage law is adapted to the fatigue life due to cyclic thermal loading employing temperature-dependence parameters. Finally, the fatigue damage law is applied to the fatigue life evaluation for the thermo-mechanical fatigue (TMF) test that reproduces a real used condition of engines.

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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.