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首页> 外文期刊>Materials Science and Engineering >Solid, shape recovered 'bulk' Nitinol: Part I-Tension-compression asymmetry
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Solid, shape recovered 'bulk' Nitinol: Part I-Tension-compression asymmetry

机译：固态，形状恢复的“散装”镍钛诺：第一部分-拉伸-压缩不对称

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As the shape memory material Nitinol (55% nickel-45% titanium alloy) emerges to find more and more applications in engineered products, understanding the effects of material processing becomes increasingly important. Its mechanical behavior is highly non-linear and is strongly dependent on alloy composition, heat treatment history and mechanical work. Published Nitinol literature is almost exclu sively related to processing and testing of thin wall, very small diameter tubing and wire devices, usually exhibiting superelastic characteristics. In strain-controlled tension-compression testing of pseudoelas-tic Nitinol shape memory wires, compression recovery forces were found to be markedly higher than tension forces. However, most experimental studies of the thermomechanical behavior of Nitinol (NiTi) to date have been conducted in uniaxial tension. There is a dearth of information in the literature regard ing the compression recovery of solid blocks of Nitinol. Questions exist on whether or not solid, "bulk" Nitinol products when deformed in compression will exhibit shape recovery characteristics and if so, will tension-compression asymmetry occur, which is seen in tensile loaded, bent wire material? The potential for shape recovery of compressed solid blocks of Nitinol products, which could have large stress-strain outputs, can enable the design of novel devices in many industries. The motivation for this research is to provide the first characterization of the shape recovery effects of "bulk" Nitinol material under compres-sive deformation modes versus the often practiced and well understood tensile loading of wire and thin wall tubing.
机译：随着形状记忆材料镍钛诺（55％镍-45％钛合金）的出现，在工程产品中发现越来越多的应用，了解材料加工的效果变得越来越重要。它的机械行为是高度非线性的，并且在很大程度上取决于合金成分，热处理历史和机械功。出版的镍钛诺文献几乎全部与薄壁，非常小直径的管道和线装置的加工和测试有关，通常表现出超弹性特征。在伪弹性镍钛诺形状记忆丝的应变控制拉伸压缩试验中，发现压缩恢复力明显高于拉伸力。但是，迄今为止，大多数关于镍钛诺（NiTi）的热机械行为的实验研究都是在单轴张力下进行的。文献中关于镍钛诺固体块的压缩恢复的信息很少。是否存在固态“散装”镍钛诺产品在压缩变形时是否会表现出形状恢复特性，如果存在，是否会出现拉伸-压缩不对称性（在拉伸负载的弯曲金属丝材料中会出现这种情况），这是一个问题。镍钛诺产品压缩固体块形状恢复的潜力（可能具有较大的应力应变输出），可以在许多行业中设计出新颖的设备。这项研究的目的是提供在压缩变形模式下，相对于经常实践和众所周知的钢丝和薄壁管材的拉伸载荷下，“散装”镍钛诺材料的形状恢复效果的第一个表征。

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