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YAN Zhu CUI Li-shan ZHENG Yan-jun 《中国航空学报》2007,20(2):168-171
The study is a first attempt to prepare bulk NiTi/NiTi shape memory alloy (SMA) laminates with a macroscopic heterogeneous composition by explosive welding and investigate their microstructures and martensitic transformation behaviors. After explosive weld- ing, a perfect interfacial bonding between the two components and a reversible martensitic transformation are realized in the tandem. Results show achievement of a fine granular structure and the maximum value of microhardness near the welding interface because of the excessive cold plastic deformation and the high impact velocity during the explosive welding. Meanwhile, the effects of aging on the transformation of the welded tandem are investigated by differential scanning calorimeter (DSC) and subject to discussion. The trans- formation temperatures of NiTi/NiTi SMAs increase with the rise of the aging temperature. The experimental results indicate the shape memory properties of NiTi/NiTi SMA fabricated by explosive welding can be improved by optimizing the aging technology. 相似文献
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鸟体形状对飞机风挡鸟撞动响应的影响 总被引:3,自引:1,他引:3
目前,鸟撞动响应分析结果与试验结果不能很好地吻合.造成这个问题的原因有很多,如鸟体和风挡的本构关系、鸟体形状、风挡的破坏准则等.本文重点研究了鸟体形状对动响应的影响.在鸟撞动响应分析中,采用的鸟体形状主要有两大类:(1)圆柱体,(2)两端半球形、中间圆柱形的实体.本文分别采用解耦解法和耦合解法研究了这两种形状对风挡鸟撞动响应的影响,并与试验结果进行了比较.结果表明:用两种形状计算得到的应变曲线的变化趋势与试验结果都基本相符,但当飞机水平与鸟相撞时用第一种形状计算得到的风挡应变值小于用第二种形状计算得到的风挡应变值,用第二种形状计算所得的结果与试验结果更加吻合. 相似文献
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本文对于U形渡槽槽体结构模型进行了风洞实验研究,得出了U型渡槽槽体结构的风压分布和风载体型系数。风洞试验结果表明U形渡槽槽体的风压分布和风载体形系数同槽体的高宽比和流场状况有关,在同一流场状况下槽体的风载体形系数随着槽体的高宽比变化。本文的试验结果为渡槽结构的抗风设计提供了参考依据。 相似文献
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