Study on strength and fatigue life of MK type plow bit under different planing depths
Abstract：In order to study the strength and life features of MK97-002 type plow bit under different planing depths,a solid model simulation method of the plow bit cutting coal seam process was presented.A solid model of the plow bit was established by using a flexible body material,a constitutive model of coal seam was constructed according to meshless smooth particle dynamics SPH theory,isotropic hardening theory and association flow rule,stress changes and its statistical data of the joint between blade and carbide head were obtained through planing process simulation in three planing depths of the weak joint.The fatigue life of the plow bit was predicted with a fatigue accumulating damage model built by improvement of rain-flow,linear Miner.The simulated results show that the stress of the plow bit increases with its planing depth increases,the strength is close to the allowable value and the margin is very small;the plow bit＇s cumulative damage grows,effective working time reduces,fatigue life downs and damage aggravates as planing depth increases;these conclusions accord with practice.
Keywords：plow bitfatigue lifeplaning depthsmooth particle dynamicsimprovement of rain-flow
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)