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Design of energy absorbing materials and composite structures based on porous shape memory alloys (SE).

机译：基于多孔形状记忆合金（SE）的能量吸收材料和复合结构的设计。

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摘要

Recently, attention has been paid to porous shape memory alloys. This is because the alloys show large and recoverable deformation, i.e. superelasticity and shape memory effect. Due to their light weight and potential large deformations, porous shape memory alloys have been considered as excellent candidates for energy absorption materials.; In the present study, porous NiTi alloy with several different porosities are processed by spark plasma sintering (SPS). The compression behavior of the porous NiTi is examined with an aim of using it for a possible high energy absorbing material. Two models for the macroscopic compression behavior of porous shape memory alloy (SMA) are presented in this work, where Eshelby's inhomogeneous inclusion method is used to predict the effective elastic and superelastic behavior of a porous SMA based on the assumption of stress-strain curve. The analytical results are compared with experimental data for porous NiTi with 13% porosity, resulting in a reasonably good agreement.; Based on the study upon porous NiTi, an energy absorbing composite structure made of a concentric NiTi spring and a porous NiTi rod is presented in this PhD dissertation. Both NiTi spring and porous NiTi rod are of superelastic grade. Ductile porous NiTi cylindrical specimens are fabricated by spark plasma sintering. The composite structure exhibits not only high reversible force-displacement behavior for small to intermediate loading but also high energy absorbing property when subjected to large compressive loads. A model for the compressive force-displacement curve of the composite structure is presented. The predicted curve is compared to the experimental data, resulting in a reasonably good agreement.
机译：近来，注意力已经集中在多孔形状记忆合金上。这是因为合金显示出大且可恢复的变形，即超弹性和形状记忆效应。由于其重量轻和潜在的大变形，多孔形状记忆合金已被认为是能量吸收材料的极佳候选材料。在本研究中，通过火花等离子体烧结（SPS）处理具有几种不同孔隙率的多孔NiTi合金。为了将多孔镍钛用于可能的高能量吸收材料，研究了多孔镍钛的压缩行为。这项工作提出了两种用于多孔形状记忆合金（SMA）宏观压缩行为的模型，其中埃舍尔比（Eshelby）的不均匀夹杂法基于应力-应变曲线的假设来预测多孔SMA的有效弹性和超弹性行为。将分析结果与孔隙率为13％的多孔NiTi的实验数据进行比较，得出了相当好的一致性。在对多孔镍钛合金的研究基础上，提出了一种由同心镍钛弹簧和多孔镍钛棒组成的吸能复合结构。 NiTi弹簧和多孔NiTi棒均为超弹性等级。延性多孔NiTi圆柱试样通过火花等离子体烧结制成。该复合结构不仅在小至中等载荷下表现出高可逆的力-位移性能，而且在承受大压缩载荷时也表现出高能量吸收性能。提出了复合结构压缩力-位移曲线的模型。将预测的曲线与实验数据进行比较，得出合理的一致性。

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  • 作者

    Zhao, Ying.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Engineering Mechanical.; Engineering Metallurgy.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 129 p.
  • 总页数 129
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;冶金工业;工程材料学;
  • 关键词

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