Development of an Energy-Based Experimental Method for Estimation of Fatigue Crack Evolution in Titanium Alloys

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Physical Mesomechanics Pub Date : 2024-02-08 DOI:10.1134/S1029959924010041

A. Yu. Iziumova, A. N. Vshivkov, O. A. Plekhov

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Abstract

This paper presents an experimental study of energy dissipation caused by fatigue crack growth in Grade 2 titanium and titanium alloys Ti-1.1Al-0.9Mn and Ti-4.6Al-1.77V using the original heat flux method. It is shown that significant structural changes occur in the material under plastic deformation, leading to internal energy evolution. As is known, a large part of the deformation energy is dissipated as heat. The developed method allows high-accuracy measurements of the heat flux caused by plastic zone development at the crack tip directly in the fatigue experiment. Simultaneous measurements of the crack length and displacements in the stress concentration zone allow estimating the energy balance of the tested specimens. Analysis of the obtained data confirms that the stored strain energy reflecting the structural state of the material can be used as a fracture criterion. Based on the heat flux data, a kinetic equation is derived for predicting the rate of fatigue crack growth under Paris’s law by the energy dissipation rate.

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开发基于能量的实验方法，用于估算钛合金疲劳裂纹的演变

摘要本文采用原始热通量法对 2 级钛和钛合金 Ti-1.1Al-0.9Mn 和 Ti-4.6Al-1.77V 中疲劳裂纹生长引起的能量耗散进行了实验研究。结果表明，材料在塑性变形下会发生重大结构变化，导致内能演变。众所周知，变形能量的很大一部分以热量的形式耗散。所开发的方法可在疲劳实验中直接对裂纹尖端塑性区发展所产生的热通量进行高精度测量。同时测量应力集中区的裂纹长度和位移，可以估算出测试试样的能量平衡。对所获数据的分析证实，反映材料结构状态的存储应变能可用作断裂标准。根据热通量数据，推导出一个动力学方程，通过能量耗散率来预测帕里斯定律下的疲劳裂纹增长速度。

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.