Effect of phase transformation on wave speeds in TiNi alloy thin-walled tube

被引：0

作者：

Cui, Shitang ^{[1
]}

Zhao, Hongyu ^{[2
]}

Dong, Fangdong ^{[3
]}

Zhang, Yongliang ^{[1
]}

机构：

[1] CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Anhui, Hefei

[2] Unit 32213 of People’s Liberation Army of China, Hebei, Zhangjiakou

[3] Science and Technology on Transient Impact Laboratory, Beijing

来源：

Baozha Yu Chongji/Explosion and Shock Waves | 2024年 / 44卷 / 09期

关键词：

composite stress wave; phase transformation; pseudo-elastic; thin-walled tube; TiNi alloy;

D O I：

10.11883/bzycj-2023-0368

中图分类号：

学科分类号：

摘要：

Shape memory alloys undergo phase transformation under strong impact loads, and the phase transformation has a significant impact on the dynamic mechanical response of their structural components. Based on the phase transformation critical criterion considering both hydrostatic pressure and deviatoric stress effects, an incremental constitutive model of phase transformation is derived. The analytical expression of characteristic wave speed under complex stress state is obtained based on the generalized characteristic theory. The characteristic wave speed is not only related to the mechanical parameters of the material itself (such as the tension-compression asymmetry and the modulus of the mixed phase), but also related to the stress state of the material. For TiNi alloys with volume expansion due to phase transformation, the increase of tensile-compressive asymmetry coefficient will increase the wave speed of slow waves, while having almost no effect on fast waves. At the short axis of the phase transformation ellipse (α = 90°), the wave speed of slow waves is the lowest and decreases significantly with the increase of the dimensionless modulus of the mixed phase. When the dimensionless modulus of the mixed phase increases from 2 to 5, the wave speed decreases by 36.2%, while the wave speed of fast waves reaches the maximum value c0, which is independent of the modulus of the mixed phase; at the long axis of the phase transformation ellipse (α = 180°), the speed of slow waves reaches the maximum value, and the wave speed of fast waves reaches the minimum value c2 © 2024 Explosion and Shock Waves. All rights reserved.

引用

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