STUDY ON IMPACT DAMAGE OF GRANULAR MATERIAL

HE Siming1, 2, 3 Liao Zuwei 4 Liu Wei1, 2 Yan Shuaixin1, 2

Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (23) : 100-105.

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PDF(1169 KB)
Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (23) : 100-105.

STUDY ON IMPACT DAMAGE OF GRANULAR MATERIAL

  • HE Siming1, 2, 3    Liao Zuwei 4  Liu Wei1, 2   Yan Shuaixin1, 2
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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.

Key words

Granular material / impact damage / Hertz theory / damage accumulation / Discrete Element Method (DEM)

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HE Siming1, 2, 3 Liao Zuwei 4 Liu Wei1, 2 Yan Shuaixin1, 2. STUDY ON IMPACT DAMAGE OF GRANULAR MATERIAL[J]. Journal of Vibration and Shock, 2016, 35(23): 100-105

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