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TiNi形状记忆合金变形特性实验研究   总被引:2,自引:0,他引:2  
王志刚 《力学学报》1995,27(5):587-596
给出了一种TiNi形状记忆合金的单轴拉压、循环拉伸加卸载、形状记忆效果、恢复力、相变塑性变形及拉压-扭转比例、非比例加卸载的实验结果,实验结果显示,其变形特性非常不同于普通的弹塑性材料:如Bauschinger效果提前,甚至于会出现于卸载阶段;低温下的残余变形会在加热后消失;恒载下冷却时产生相当大的塑性变形且在加热时消失等等。  相似文献
2.
Oscillatory shear measurements on a series of branched graft polystyrenes (PS) synthesized by the macromonomer technique are presented. The graft PS have similar molar masses (M w between 1.3×105 g/mol and 2.4×105 g/mol) and a polydispersity M w /M n around 2. The molar masses of the grafted side chains M w,br range from 6.8×103 g/mol to 5.8×104 g/mol, which are well below and above the critical entanglement molar mass M c of linear polystyrene. The average number of side chains per molecule ranges from 0.6 to 6.7. The oscillatory measurements follow the time–temperature superposition principle. The shift factors do not depend on the number of branches. The zero-shear viscosities of all graft PS are lower than those of linear PS with the same molar mass, which can be attributed to the smaller coil size of the branched molecules. It is shown that the influence of branching on the frequency dependence of the dynamic moduli is weak for all graft PS that were investigated, which can be explained by the low entanglement density.Electronic Supplementary Material Supplementary material is available for this article at This article has already been published online first (DOI: ). Due to an oversight at the publisher's, this version contained several mistakes. The article is herewith republished in its entirety as a "publisher's erratum".  相似文献
3.
利用中科院武汉岩土力学研究所的岩石破裂过程细观力学实验系统,对不同水泥掺量的水泥土试件进行了单轴压缩细观实验,该试验系统可通过显微镜和数码视频装置实时观测水泥土试件的细观结构及其破坏的全过程,试验得到了水泥土破裂过程中的细观图像及其相应应力应变关系曲线.分析了不同水泥掺量的水泥土试件的细观破坏特征及其与宏观力学行为的关系,研究为水泥土细观损伤本构模型的建立提供了实验依据.  相似文献
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