HE Siming1, 2, 3 Liao Zuwei 4 Liu Wei1, 2 Yan Shuaixin1, 2
1. Key laboratory of Mountain Hazards and Surface Process，Chinese Academy of Science，Chengdu, Sichuan 610041, China;
2. Institute of Mountain Hazards and Environment，Chinese Academy of Sciences，Chengdu, Sichuan 610041, China;
3. Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101,China;
4. Chengdu Command engineering&research designing institute, Kunming,Yunnan,China 650031
Abstract：The normal contact stiffness of granular material has a significant influence on the results obtained by the Discrete Element Method (DEM). Under repeated impacts during movement, the micro-defects existed in granular materials will expand and converge and thus weaken the particle physical mechanical properties, i.e. the particle contact stiffness decreases gradually till the particle finally crash. Based on Hertz Elasticity Theory and Continuum Damage Mechanics, this paper defined an impact damage variable of granular materials and proposed an impact damage evolution equation to calculate impact damage accumulation.The results indicate that the material damage can be detected even at low impact velocity, and the accumulation of impact damage decreases the contact stiffness which may result in final breakage of the particles. Thus, as a common phenomenon, damage accumulation should be taken into consideration in Discrete Element analysis to obtain an accurate result in future.
何思明1,2,3 廖祖伟4 刘威1,2 闫帅星1,2 . 颗粒物质冲击损伤特性研究[J]. 振动与冲击, 2016, 35(23): 100-105.
HE Siming1, 2, 3 Liao Zuwei 4 Liu Wei1, 2 Yan Shuaixin1, 2. STUDY ON IMPACT DAMAGE OF GRANULAR MATERIAL. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(23): 100-105.
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