N. Resnina, A. Ivanov, Feodor Belyaev, Alexander Volkov, S. Belyaev
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引用次数: 0
摘要
本文的目的是模拟不同条件下富镍NiTi合金等温保温时的应变变化。采用改进的Likhachev-Volkov微观结构模型和新的Nelder-Mead算法确定模型参数。为了确定模型参数,选取了Ni 51 Ti 49合金在200 MPa应力下保温的实验数据。利用这些参数,模拟了两种应力状态下NiTi合金的应变变化规律。结果表明,改进的Likhachev-Volkov微观结构模型可以计算出在应力状态1下冷却后保温的等温应变变化,理论结果与实验结果具有良好的相关性。同时,由于模型没有考虑两种状态下储存弹性能的差异,对主动变形(状态2)后保持时的应变变化的模拟与实验数据不拟合。结果表明,在主动变形后的应力作用下,变形过程中所储存的弹性能的减少增加了保持过程中的应变,使模拟曲线与实验曲线更为接近。
Simulation of recoverable strain variation during isothermal holding of the Ni51Ti49 alloy under various regimes
The aim of the present paper is to simulate the strain variation on isothermal holding of Ni-rich NiTi alloy under various regimes. The modified Likhachev-Volkov microstructural model and a new Nelder-Mead algorithm for the determination of the model parameters were used. To determine the model parameters, the experimental data obtained during holding of the Ni 51 Ti 49 alloy under a stress of 200 MPa were chosen. Using these parameters, the strain variation on holding of the NiTi alloy under a stress in two regimes was simulated. It was shown that the modified Likhachev-Volkov microstructural model allowed one to calculate the isothermal strain variation on holding after cooling under a stress (Regime 1) and a good correlation between the theoretical and experimental results were found. At the same time, the simulation of the strain variation on holding after active deformation (Regime 2) did not fit to experimental data because the model did not consider the difference in the stored elastic energy in two regimes. It was shown that a decrease in the elastic energy stored during the transformation increased the strain during holding under a stress after active deformation and made the simulated curves to be close to the experimental.
期刊介绍:
The aim of "Letters on materials" is to provide a fast publication of short research and review articles on various topics in materials science and related areas of material physics and mechanics. The editorial board sees it''s own task in rapid informing of the readers on the state-of-the-art challenges and achievements in materials science. The editorial board does its best to select high quality papers reporting new scientific results that are of interest for researchers in materials science, physics, and mechanics. "Letters on materials" invites Russian and foreign researches to publish papers in both the Russian and English languages. The scope of the journal covers the following research areas: structure analysis of materials, mechanical and physical properties of materials, production and processing of materials, experimental methods of investigation of materials, theory and computational methods in solid state physics. "Letters on materials" is designed for researchers, engineers, lecturers, and students working in the areas of materials science, mechanical engineering, metal forming, physics, and material mechanics.