【摘要】 为了揭示颗粒外形对无粘性散体摩擦机理的影响,将无粘性颗粒材料之间的摩擦作用分解为颗粒间宏观咬合和微观咬合摩擦,运用不规则外形颗粒离散元建模方法,进行撞击模拟和自然安息角模拟,研究颗粒外形对微观咬合摩擦和宏观咬合作用的影响.数值计算结果表明,不规则外形颗粒集料摩擦因数近似为接触面摩擦因数的2倍,椭球体集料摩擦因数与接触面摩擦因数近似相等;颗粒外形不同使得颗粒运动状态呈现出滑动或滚动特征,并影响其宏观咬合特性及颗粒集料的摩擦性能.更多还原

【Abstract】 In order to reveal the effects of particle shape on friction mechanism,frictions among non-viscous particles were decomposed into the macro biting-force and the mesoscopic biting-force.Impact and angle-of-repose(AOR) numerical tests were conducted to study the effects of particle shape on macro biting-force and mesoscopic biting-force by modeling irregular shape particles using discrete element method.The results of numerical tests show that the friction coefficient of irregularly shaped particles is nearly two times its interface friction coefficient,while the friction coefficient of ellipsoid particles is approximately equal to the interface friction coefficient.Meanwhile,different particle shapes endowed the particles with rolling or slipping characteristics,and influence the macro biting-force and the granular friction behavior.更多还原