结构振动控制的不同直径NiTi丝力学性能试验研究

钱 辉; 李静斌 李宏男 陈 淮

振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 89-95.

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PDF(3870 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 89-95.
论文

结构振动控制的不同直径NiTi丝力学性能试验研究

  • 钱 辉1, 2 李静斌1 李宏男2 陈 淮1
作者信息 +

Experimental investigation of mechanical behavior of NiTi wires with different diameters for structural vibration control

  • Qian Hui 1, 2 ,LIJingbi1 , Li Hongnan 2 , chen Huai 1
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摘要

试验研究了三种直径超弹性NiTi SMA丝的力学特性,考察了循环加载次数、应变幅值、加载速率和环境温度对其力学性能(相变应力、每循环耗散能量、割线刚度、等效阻尼比和残余应变等)的影响,揭示了加卸载过程中因潜热引起的SMA丝温度的变化规律。研究表明:随着循环加载次数的增加,三种材料的马氏体相变开始应力降低、每循环耗散能量和割线刚度逐渐减小,而残余应变累计增大,但约20圈后趋于稳定。而在同等条件下,三种材料相比,直径0.5mm SMA丝阻尼耗能特性和自复位特性优于另两种材料,而直径1.2mm和2.0mm SMA丝的力学性能基本接近。试验结果为SMA阻尼器的设计提供了依据。

Abstract

Cyclic tensile tests on superelastic NiTi SMA wires with three diameters were carried out. The effects of the different loading conditions, namely: cyclic loading-unloading number, strain amplitude, loading frequency and ambient temperature, on the mechanical behavior described by some fundamental quantities, such as transformation stress, energy dissipation per cycle, secant stiffness, equivalent damping as well as residual strain, were examined. The temperature changes of the SMA wires due to the latent heat under different loading conditions are analyzed. The results show that with the increasing of the cyclical number, the martenside transformation start stress of all the three specimens decrease, and the energy dissipation per cycle and the secant stiffness gradually reduce, while the residual strains increase, however, all the behaviors tend to be stable after 20 cycles. Under the same condition, damping and re-centering properties of 0.5 millimeter SMA are superior to the other two, but the mechanical behaviors of 1.2 and 2.0 millimeter SMAs are basally approximate. The experimental results can provide basis for the design of SMA based energy dissipation devices.


关键词

形状记忆合金 / 超弹性 / 智能结构 / 振动控制 / 力学性能

Key words

shape memory alloy / superelasticity / smart structure / vibration control / mechanical behavior

引用本文

导出引用
钱 辉; 李静斌 李宏男 陈 淮. 结构振动控制的不同直径NiTi丝力学性能试验研究[J]. 振动与冲击, 2013, 32(24): 89-95
Qian Hui; ;LIJingbi;Li Hongnan ; chen Huai . Experimental investigation of mechanical behavior of NiTi wires with different diameters for structural vibration control[J]. Journal of Vibration and Shock, 2013, 32(24): 89-95

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