Prediction of Strain Hardening and Durability Based on the Calculated Non-Proportional Cyclic Hardening Coefficient

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
M. V. Borodii
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Abstract

The effectiveness of the previously proposed improved approach for determining the non-proportional cyclic hardening coefficient in predicting the maximum level of strain hardening and durability of metallic materials was tested. The approach is based on the correlation between static and cyclic strain hardening of metallic materials, takes into account the amplitude of cyclic deformation, and does not require fatigue experiments under non-proportional loading. The calculated and experimental values of this coefficient were compared for structural materials with different cyclic and physical properties. For the 27 analyzed materials, the maximum level of strain hardening was predicted using the obtained calculated coefficient, and a good agreement with experimental data was demonstrated. Using the strain criterion for assessing durability, which includes the calculated non-proportional cyclic hardening coefficient, the durability for circular cyclic trajectories of non-proportional deformation was predicted on the basis of the basic uniaxial fatigue diagram. Satisfactory results of durability prediction (in comparison with the experiment) were obtained for materials with FCC metal lattice structure. For materials with BCC structure, the agreement between the calculated and experimental data was somewhat worse. It is shown that for this type of materials, the use of an alternative method for determining the non-proportional cyclic hardening coefficient can improve the results of durability prediction.

Abstract Image

根据计算得出的非比例循环硬化系数预测应变硬化和耐久性
测试了之前提出的确定非比例循环硬化系数的改进方法在预测金属材料应变硬化最大程度和耐久性方面的有效性。该方法基于金属材料静态应变硬化和循环应变硬化之间的相关性,考虑了循环变形的振幅,并且不需要在非比例加载条件下进行疲劳实验。针对具有不同循环和物理特性的结构材料,对该系数的计算值和实验值进行了比较。对于 27 种分析过的材料,利用计算得出的系数预测了应变硬化的最大程度,结果表明与实验数据十分吻合。评估耐久性的应变标准包括计算出的非比例循环硬化系数,利用该标准,在基本单轴疲劳图的基础上预测了非比例变形圆形循环轨迹的耐久性。FCC 金属晶格结构材料的耐久性预测结果令人满意(与实验相比)。对于 BCC 结构的材料,计算数据与实验数据之间的一致性稍差。这表明,对于这类材料,使用另一种方法确定非比例循环硬化系数可以改善耐久性预测结果。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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