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纳米固体热导行为的尺寸效应及损伤失效特征
Authors
梁立红
Publication date
6 January 2019
Publisher
Abstract
纳米固体指至少一维尺寸在纳米尺度的固体如纳米颗粒、纳米线、纳米薄膜、以及微结构是纳米尺度的宏观材料,由于固体或微结构的尺度远远小于传统块体材料,纳米固体的许多物理和力学性能都呈现出不同于块体的尺度效应,如纳米线热导率降低、纳米薄膜弹性模量增加等。这里首先针对纳米固体热导行为的尺寸效应展开系列研究,发展了一个同时考虑声子限域和表界面效应的跨尺度模型,有效表征了纳米线、微纳米薄膜以及纳米结构涂层直径、厚度及微结构尺度依赖的热导率,模型预测与实验结果或分子动力学模拟结果一致,为设计开发新型热电材料、高效热障涂层等相关能源应用提供了理论依据。并进一步针对纳米结构陶瓷涂层在热震、弯曲等载荷下的损伤失效行为展开了实验和模拟研究,表征了纳米结构涂层损伤演化的幂率规律和尺寸依赖特征
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Institute Of Mechanics,Chinese Academy of Sciences
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Last time updated on 18/12/2019