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颗粒材料破碎演化路径细观热力学机制

沈超敏 刘斯宏

沈超敏, 刘斯宏. 颗粒材料破碎演化路径细观热力学机制[J]. 力学学报, 2019, 51(1): 16-25. doi: 10.6052/0459-1879-18-340
引用本文: 沈超敏, 刘斯宏. 颗粒材料破碎演化路径细观热力学机制[J]. 力学学报, 2019, 51(1): 16-25. doi: 10.6052/0459-1879-18-340
Shen Chaomin, Liu Sihong. EVOLUTION PATH FOR THE PARTICLE BREAKAGE OF GRANULAR MATERIALS: A MICROMECHANICAL AND THERMODYNAMIC INSIGHT[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(1): 16-25. doi: 10.6052/0459-1879-18-340
Citation: Shen Chaomin, Liu Sihong. EVOLUTION PATH FOR THE PARTICLE BREAKAGE OF GRANULAR MATERIALS: A MICROMECHANICAL AND THERMODYNAMIC INSIGHT[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(1): 16-25. doi: 10.6052/0459-1879-18-340

颗粒材料破碎演化路径细观热力学机制

doi: 10.6052/0459-1879-18-340
基金项目: 1) 国家自然科学基金(U1765205),国家重点研发计划(2017YFC0404800)以及中央高校基本科研业务费专项资金(2018B40914)资助项目.
详细信息
    作者简介:

    作者简介: 2) 刘斯宏,教授,博导,主要研究方向:土石坝工程、粒状体力学与土工袋技术. E-mail: Sihongliu@hhu.edu.cn

  • 中图分类号: TV16;

EVOLUTION PATH FOR THE PARTICLE BREAKAGE OF GRANULAR MATERIALS: A MICROMECHANICAL AND THERMODYNAMIC INSIGHT

  • 摘要: 颗粒材料在高应力环境下会发生颗粒破碎现象,颗粒破碎不仅影响颗粒材料的力学特性,同时与大量工程问题密切相关.目前的相关研究主要集中在唯象地描述颗粒破碎的演化以及破碎对力学特性的影响层面,对颗粒破碎演化路径的物理机制研究较少.本文基于热力学框架,采用细观力学中细观-宏观的均匀化方法推导了颗粒体系弹性能和破碎能量耗散,并在最大能量耗散的假设下,在热力学框架内,建立了理想化的无摩擦球体颗粒等向压缩过程的弹性-破碎模型,阐述了颗粒材料破碎演化路径细观热力学机制.由于模型的推导不依赖任何唯象的经验公式,因此模型中包含的参数均有明确的物理意义.模型预测与前人试验结果对比表明,材料的初始级配对弹性压缩模量和破碎应力的影响并不相同:不同分形维数级配对应的弹性体变模量存在极大值,而破碎应力却随着分形维数的增大单调递增;颗粒破碎的演化符合最大能量耗散原理,且颗粒材料的压缩曲线可以分为弹性-破碎-拟弹性3个机制不同的阶段.

     

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  • 刊出日期:  2019-01-18

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