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Effect of Structural Relaxation on Deformation Behaviour of Zr-Based Metallic Glass 总被引:1,自引:0,他引:1 下载免费PDF全文
Structural relaxation through isothermal annealing at temperature below glass transition is conducted on Zr46.75 Ti8.25 CU7.5Ni11Be27.5 (Vitreloy-4) bulk metallic glass. Defect concentration is correlated with the annealing time t according to differential scanning calorimetry thermalgrams. The effects of structural relaxation on mechanical properties and deformation behaviour are investigated by using instrumented nanoindentation. It is found that the as-cast alloy exhibits pronounced serration flow during the loading process of nanoindentation, and the size and number of the serrations decrease with the annealing time. The change of the deformation behaviour with structural relaxation is explained using a free volume model. 相似文献
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数字图像相关方法在桥梁裂缝变形监测中的应用 总被引:4,自引:0,他引:4
本文结合工程实际背景分析了数字图像相关方法应用在桥梁裂缝变形监测中的可行性及优越性。根据桥梁裂缝变形的特点采用数字图像处理技术中的位移梯度法进行所选区域的相关匹配搜索并对相关系数的计算公式加以改进。使实验过程得以简化。计算结果全场化、直观化。本文对数字图像处理软件的测量精度和在实际测量中的测试误差进行了分析和研究。证明该软件能够更加精确地测定裂缝在各种荷载作用下的变形量值.实际的桥梁测试也验证了该方法的可行性和优越性。若图像记录设备的分辨率是12.47pixel/mm(0.0802ram/pixel)。本文所涉及到的桥梁裂缝边缘的位移测试精度为0.000802mm。 相似文献
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