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首页> 外文会议>IUTAM Symposium on Dynamics of Advanced Materials and Smart Structures May 20-24, 2002 Yonezawa, Japan >DYNAMIC BEHAVIOR OF SHAPE MEMORY ALLOY STRUCTURAL DEVICES: NUMERICAL AND EXPERIMENTAL INVESTIGATION
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DYNAMIC BEHAVIOR OF SHAPE MEMORY ALLOY STRUCTURAL DEVICES: NUMERICAL AND EXPERIMENTAL INVESTIGATION

机译：形状记忆合金结构装置的动态行为：数值和实验研究

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摘要

Several aspects of the dynamic response of shape memory alloy structural components have been investigated at the authors' laboratory. As reported in [5], they cover: (ⅰ) the symmetry of the response under cyclic loading in tension-compression and torsion; (ⅱ) the dependence of the response on the strain rate; (ⅲ) the ability to recover strain; and, mainly, (ⅳ) the risk of moving from martensite to austenite due to the heating generated by the energy dissipation during hysteretic cycles of loading-unloading. The last aspect received special attention within this paper where the results of a further experimental campaign are illustrated. The application of this material, in its austenitic phase, to the retrofitting of cracked monolithic monuments is also discussed. The policy of filling the cracks with mortar or other suitable plastic materials cannot be regarded as a suitable repair. Indeed, in this way one would loose the possibility of relative motions between blocks which is a convenient way of dissipating energy under dynamic excitation. The implementation of the material model, as resulting from the testing campaign, in a user-subroutine written for a selected general purpose finite element code, provides eventually a design tool for such a device.
机译：作者实验室已经研究了形状记忆合金结构部件动态响应的几个方面。如[5]中报道的，它们涵盖：（ⅰ）循环载荷在张力压缩和扭转中的响应的对称性； （ⅱ）响应对应变率的依赖性； （ⅲ）恢复应变的能力； （ⅳ）主要是由于在装卸磁滞循环过程中能量耗散产生的热量而导致从马氏体转变为奥氏体的风险。最后一个方面在本文中受到了特别关注，在此说明了进一步实验活动的结果。还讨论了该材料在其奥氏体相中对裂开的整体纪念碑的改造的应用。用砂浆或其他合适的塑料材料填充裂缝的策略不能视为合适的修复方法。的确，以这种方式可以减小块之间的相对运动的可能性，这是在动态激励下耗散能量的便利方式。由测试活动得出的材料模型的实现，在为选定的通用有限元代码编写的用户子例程中，最终为此类设备提供了设计工具。

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