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大坝缝结构变形形态的简单模拟方法 被引量:1
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作者 何建平 刘凯远 涂传林 《水力发电》 北大核心 2011年第8期31-34,共4页
为解决传统有限元接触分析算法计算量大、难于收敛的问题,提出采用弹簧间隙组合元对大坝缝初始、张开、灌浆等阶段的工作性态进行准静态和瞬态的模拟方法。通过对大坝缝典型工作形态和弹簧间隙组合元工作原理的分析,设计的几何模型综合... 为解决传统有限元接触分析算法计算量大、难于收敛的问题,提出采用弹簧间隙组合元对大坝缝初始、张开、灌浆等阶段的工作性态进行准静态和瞬态的模拟方法。通过对大坝缝典型工作形态和弹簧间隙组合元工作原理的分析,设计的几何模型综合考虑了灌浆缝、永久缝和自由缝情况。计算结果表明,该方法较好地反映了大坝缝在灌浆前和灌浆后由温度应力引起的结构变形形态,可为相关计算分析提供参考。 展开更多
关键词 大坝缝 结构变形形态 瞬态分析 灌浆 弹簧间隙组合元
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Morphology and structure evolution of metallic nanowire arrays prepared by die nanoimprinting
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作者 Xue Liu Yang Shao Zhidong Han Kefu Yao 《Science Bulletin》 SCIE EI CAS CSCD 2015年第6期629-633,M0003,共6页
Metallic nanowire arrays (NWAs) possess wide application prospects due to their unique property, and the tailoring of NWAs' structure and morphology is of importance since it would significantly influence the per- ... Metallic nanowire arrays (NWAs) possess wide application prospects due to their unique property, and the tailoring of NWAs' structure and morphology is of importance since it would significantly influence the per- formance of NWAs. In the present work, the morphology and structure evolution of the NWAs prepared by the newly developed die nanoimprinting technique has been investigated in detail. It was found that increasing pro- cessing temperature, time and pressure could increase the length of the nanowires and change the NWAs' morphol- ogy from monodispersed form to aggregated form. Increasing processing time and temperature within the supercooled liquid region would promote crystallization, while increasing processing pressure could suppress the crystallization. This work provided important insights into the structure and morphology evolution, and therefore, the tailoring of metallic NWAs prepared by die nanoimprinting through adjusting the process parameters. 展开更多
关键词 Metallic glasses (MGs) Nanowirearrays Die nanoimprinting Morphology evolution
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