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测定断后伸长率的新方法--解析法朱健康,邵燃无锡透平叶片有限公司国家能源大型涡轮叶片研发中心摘 要:GB/T 228-2002规定了用直接法和移位法测定断后伸长率,直接法测得的断后伸长率随断口所在的位置而变化,不具备唯一性;移位法弥补了直接法的不足,但是比较麻烦.笔者提出了一种测定断后伸长率的新方法--解析法.该方法利用断口两侧伸长变形的对称性,在试样断裂后较长的一半中,已经包含了试样伸长的全部信息的特征,虚拟一个拉伸试样;这个虚拟试样断口两侧的伸长变形是对称的,继而利用GB/T 17600-1998中的断......
支架四连杆机构解析法设计与优化李提建1,靳丰田21. 天地科技股份有限公司开采设计事业部2. 兖州煤业综机管理中心摘 要:介绍了一种支架四连杆的求解方法.首先由偏置曲柄滑块机构得到四连杆机构的解析解,然后采用黄金分割法求出与特定高度对应支架运动参数的数值解,给出了调整双纽线轨迹的方法.以四连杆参数的解析解为基点,适当扩大变量的作用域,运用优化方法可得到满足要求的四连杆参数.关键词:四连杆;优化;液压支架;......
of the CNTs reinforced Cu and Al based composite materials in recent years was reviewed. Five main aspects including the pretreatment of CNTs, the preparation of CNTs-metal composite powder, the preparation of CNTs-metal composites, the interfacial bonding mechanism and the reinforcement mechanism of CNTs were discussed. Key words: carbon nanotubes; copper-based composite; aluminum-based......
. The preparation processes of ZAO were expounded. The preparation technologies, namely sol-gel method, metal chemical vapor deposition, magnetron sputtering, pulsed laser deposition and thermal spray of ZAO films were analyzed. Finally, the directions of research and development were described. Key words: Al-doped-ZnO; typical properties; preparation processes; powder; targets; thin films 随着半导体,计算机和太阳能......
; 文献标志码:A Research progress in field emission properties and controllable preparation of one-dimensional W nano-materials WANG Chao, HE Yue-hui, PENG Chao-qun, WANG Shi-liang, LIU Xin.... The impact factors on the field emission properties of different preparation methods were analyzed. It is pointed out that the electric field enhancement......
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WO3变色薄膜材料制备方法及应用进展姚妍1,王琳瑛1,丁毅1,马立群1(1.江苏省南京市南京工业大学材料科学与工程学院)摘 要:分析比较WO3变色薄膜的各种制备方法,概述近年来WO3变色薄膜在国内外的应用现状和发展趋势.关键词:无机非金属材料; WO3薄膜; 综述; 制备方法; 应用......
钨铜复合材料制备及应用进展张喜庆1(1.江西省赣州市江西理工大学材料与化学工程学院)摘 要:综述纳米W粉及Cu粉的制备方法及W-Cu合金的合成方法,介绍钨铜复合材料在电子封装,集成电路,国防军工,航空航天等高尖端技术领域的应用及发展现状.关键词:金属材料; 钨铜复合材料; 综述; 制备; 应用......
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