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On the layered medium with elastic and shape memory alloy plies under various loading rates

机译:在具有弹性和形状记忆合金的层状介质上,各种装载率

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The behavior of layered structure composed of shape memory alloy (SMA) and elastic plies is investigated in the present paper. We study two modes of deformation: simple compression and simple contraction. We obtain distribution fields of state parameters (temperature, martensitic phase fraction) in the layered structure for several rates of stress controlled loading. The study is motivated by possible practical application of SMA alloys in isolation mounts. The effectiveness of the SMA material operation in these applications essentially depends on internal dissipation in the material itself. It appears that the mode of material operation in the structure is important. First we recall constitutive equations of so called R_L model of SMA materials, stipulated to be valid in the pseudoelastic range of their behavior. We formulate the relevant coupled thermo-mechanical problems for the studied modes of deformation. We solved the problems by using elaborated by the author computer code procedures being an implementation of constitutive relations into finite element code. The analysis delivers insight into SMA alloy peration in different strain states. The study of SMA alloy ply behavior may be helpful when analyzing the behavior of damping elements like washers, active control elements or cladding made of NiTi in a flow machinery.
机译:在本文中研究了由形状记忆合金(SMA)和弹性层组成的分层结构的行为。我们研究了两种变形模式:简单的压缩和简单收缩。我们获得分层结构中的状态参数(温度,马氏体相级分)的分布场,以获得几个应力控制负载率。该研究是通过在隔离安装座中的SMA合金的可能实际应用的动机。这些应用中SMA材料操作的有效性基本上取决于材料本身的内部耗散。看来,结构中的材料操作模式很重要。首先,我们记得所谓的SMA材料的r_l模型的组成方程,规定在其行为的伪弹性范围内有效。我们制定所研究的变形模式的相关耦合热机械问题。我们通过使用作者计算机代码过程阐述的阐述来解决问题,该问题是将本构关系的实现为有限元代码。分析在不同应变状态下,对SMA合金呈现的洞察力提供了洞察力。当分析垫圈等阻尼元件的行为时,对SMA合金PLY行为的研究可能有所帮助,在流动机械中由NITI制成的垫圈。

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