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首页> 外文期刊>Engineering Structures >Shape memory alloy CuAlBe strands subjected to cyclic axial loads
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Shape memory alloy CuAlBe strands subjected to cyclic axial loads

机译：形状记忆合金CuAlBe股线承受循环轴向载荷

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摘要

Structural cables are composed of wires helically wound into strands, which, in turn, are wound around a core. They have high redundancy and can be used to carry large tensile forces in many civil engineering structures. Better dissipation and/or recentering capacity can be expected if the cable is composed of shape memory alloy (SMA) wires in the austenite phase. Tensile tests were performed on strands made of CuAlBe SMA wires to characterize their behavior and demonstrate their potential utility as adaptive or resilient tension elements. In particular, equivalent viscous damping and forward-transformation and maximum stresses were determined for different strain amplitudes. Nearly ideal superelastic properties were obtained up to 3% axial strain. The equivalent damping increased with strain, reaching a value of 4% for a strain amplitude of 5%. Strand experimental results were used to validate a two-dimensional numerical model developed to estimate the strand response to axisymmetric loads within the superelastic deformation range. The model relies on the linearization of the wire geometry and on a multilinear CuAlBe wire stress-strain relationship. The proposed model adequately predicts the maximum strand stress and the residual strains for different strain amplitudes.
机译：结构电缆由螺旋缠绕成股的电线组成，然后依次缠绕在芯上。它们具有很高的冗余度，可用于在许多土木工程结构中承受较大的拉力。如果电缆由奥氏体相中的形状记忆合金（SMA）线组成，则可以预期具有更好的耗散性和/或对中能力。对由CuAlBe SMA钢丝制成的绞线进行拉伸测试，以表征其行为并证明其作为自适应或弹性拉伸元件的潜在用途。特别是，对于不同的应变幅度，确定了等效的粘性阻尼和正向变形以及最大应力。在轴向应变高达3％时获得了近乎理想的超弹性。等效阻尼随应变而增加，应变幅度为5％时，等效阻尼达到4％的值。钢绞线的实验结果用于验证二维数值模型，该模型用于估算钢绞线对超弹性变形范围内轴对称载荷的响应。该模型依赖于导线几何形状的线性化以及多线性CuAlBe导线的应力-应变关系。所提出的模型可以充分预测最大应变应力和不同应变幅度下的残余应变。

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  • 来源
    《Engineering Structures》 |2011年第10期|p.2910-2918|共9页
  • 作者

    J.F.Beltran; C.Cruz; R.Herrera; O.Moroni;

  • 作者单位

    Universidad de Chile,Facultad de Ciencias Fisicas y Matematicas,Beaucheff 850,Santiago,Chile;

    Universidad de Chile,Facultad de Ciencias Fisicas y Matematicas,Beaucheff 850,Santiago,Chile;

    Universidad de Chile,Facultad de Ciencias Fisicas y Matematicas,Beaucheff 850,Santiago,Chile;

    Universidad de Chile,Facultad de Ciencias Fisicas y Matematicas,Beaucheff 850,Santiago,Chile;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    shape memory alloys; cualbe alloy; cables; mechanical characterization; damping capacity;

    机译：形状记忆合金;铜合金电缆;机械特性阻尼能力;

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