Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (8): 1211-1216.DOI: 10.12068/j.issn.1005-3026.2018.08.029

• 力学 • Previous Articles    

A Modeling Approach of Elastoplastic Contact for Analyzing the Vibration and Energy Dissipation Characteristics of Particles

LI Jian1, GAO Wei1, ZHANG Ya-shuang2, LIU Yu-nuo3   

  1. 1. School of Sciences, Northeastern University, Shenyang 110819, China; 2. Aero Engine Group of China Shenyang Liming Aero-Engine Corporation Ltd., Shenyang 110043, China; 3. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2017-04-20 Revised:2017-04-20 Online:2018-08-15 Published:2018-09-12
  • Contact: LI Jian
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Abstract: A general contact modeling method of elastoplastic contact between particles is proposed to study the vibration and energy dissipation characteristics of the particle system. The basic form of constitutive equation concerning normal plasticity contact between particles is established and a dimensionless constitutive relation can be obtained based on the finite element method accordingly. A loading-unloading multipath model of elastoplastic contact between particles is presented. A theoretical formula of normal plastic energy dissipation is deduced. Based on the discrete element method, numerical simulations on the characteristics of vibration and energy dissipation for the particle system under harmonic excitation are carried out. The results show that the linear system exhibits the characteristics of nonlinear vibration caused by particles. Granular media appears to be a complicated nonlinear state of motion similar to the chaos near the resonance region. Although the way of energy dissipation on particle damping effect remains unchanged, normal plastic contact alters the dynamic contact behavior between particles and has great influence on the dynamic characteristics of the vibrating particle system.

Key words: granular media, plastic contact, FEM, DEM, dimensionless constitutive equation, multipath model

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