Dynamic Behavior and Shock Absorption Properties of Porous Shape Memory Alloys
Dynamic Behavior and Shock Absorption Properties of Porous Shape Memory Alloys
复制标题
多孔形状记忆合金的动态行为和减震性能
DOI：
10.21236/ada403775
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发表时间：
2002
影响因子：
3.3
通讯作者：
D. Lagoudas
中科院分区：
文献类型：
--
作者：
D. Lagoudas
摘要：本文采用两种方法制备多孔NiTi形状记忆合金：常规烧结和热等静压加压烧结。根据不同的参数，如烧结时间和温度，以及初始粉末尺寸和压实，多孔试样已产生不同的平均孔径。用差示扫描量热仪测定了多孔NiTi试样的相变温度，用X射线衍射仪和扫描电子显微镜结合电子探针显微分析仪分析了多孔NiTi试样的显微结构和相组成。对不同多孔NiTi试样进行了准静态和动态压缩试验，以评价其伪弹性和马氏体退孪晶行为。利用微机械平均技术模拟了多孔SMA的有效响应。利用致密形状记忆合金的性质和孔的形状、体积分数以及给定的孔取向等信息，建立了多孔形状记忆合金材料的宏观本构模型。本构模型的SMA矩阵，这是能够占塑性应变的发展，开发的建模工作的一部分。数值模拟结果与实验数据进行了比较。
Abstract : Two methods for producing porous NiTi shape memory alloy (SMA) were used in this work: conventional sintering and sintering at elevated pressure using a Hot Isostatic Press. Depending on various parameters such as sintering times and temperatures, as well as initial powder size and compaction, porous specimens have been produced with varying average pore sizes. The phase transformation temperatures of the porous NiTi specimens were determined using a Differential Scanning Calorimeter, while their microstructure and phase compositions were analyzed using X-Ray Diffraction and a Scanning Electron Microscope aided with Electron-Probe Micro Analysis. Quasi-static and dynamic tests under compression were carried out on various porous NiTi samples to evaluate the pseudo-elasticity and the martensitic detwinning behavior. The effective response of the porous SMAs was modeled using micromechanical averaging techniques. The current work establishes a macroscopic constitutive model for the porous SMA material using the properties of the dense SMA and information about pore shape, volume fraction as well as given pore orientation. A constitutive model for the SMA matrix, which is capable of accounting for the development of plastic strains, was developed as part of the modeling effort. The results from the numerical simulations were compared with the experimental data.