Strain rate dependent formulation of the latent heat evolution of superelastic shape memory alloy wires incorporated in multistory frame structures
Strain rate dependent formulation of the latent heat evolution of superelastic shape memory alloy wires incorporated in multistory frame structures
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DOI：
10.1177/1045389x20975473
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发表时间：
2020-12-03
影响因子：
2.7
通讯作者：
Altay, Okyay
中科院分区：
文献类型：
--
作者：
Kaup, Andreas;Ding, Hao;Altay, Okyay
由于其独特的滞后能量耗散能力，形状记忆合金（SMA）线材对于开发新型结构智能振动控制系统特别有意义。然而，在结构控制中，大多数振动发生在高应变率区域，这会干扰自生热的释放，从而影响迟滞耗散。本文提出了一种依赖于应变率的潜热演化公式，旨在提高为 SMA 线开发的现有宏观建模方法的准确性，特别是针对动态负载情况。所提出的公式是通过现象学确定的，并在基于连续热机械框架的本构 SMA 线模型中实现，而不会损害求解过程的简单性和鲁棒性。所提出的配方通过 SMA 线材上进行的循环拉伸测试进行了验证。结果表明，使用该公式的计算可以比应变率无关公式更准确地预测线响应。为了模拟包含多条 SMA 线的多层框架结构，需要驱动控制方程。振动台试验是在谐波和地震激励下对三层框架结构进行的。使用应变率相关的潜热公式成功地复制了结构的响应。
Due to their unique hysteretic energy dissipation capacity, shape memory alloy (SMA) wires are particularly interesting for the development of new-type of intelligent vibration control systems for structures. However, in structural control, most of the vibrations occur in high strain rate regimes, which interfere the release of self-generated heat and thus influence the hysteretic dissipation. This paper proposes a strain rate dependent formulation of the latent heat evolution and aims to improve the accuracy of existing macroscopic modeling approaches developed for SMA wires particularly for the dynamic load cases. The proposed formulation is determined phenomenologically and implemented in a continuum thermomechanical framework based constitutive SMA wire model without impairing the simplicity and robustness of the solution process. The proposed formulation is validated by cyclic tensile tests conducted on SMA wires. Results show that the calculations using the formulation can predict the wire response more accurately than the strain rate independent formulation. For the simulation of multistory frame structures incorporating multiple SMA wires, the governing equations are driven. Shaking table tests are conducted on a 3-story frame structure under harmonic and seismic excitation. The responses of the structure are successfully replicated using the strain rate dependent latent heat formulation.