Abstract
In order to study strength characteristics of pick when cutting different hardness of rock,according to current situation that actual external load can not be obtained easily and load characteristics can not be grasped correctly, establishing flexible entity model of pick based on LS-DYNA,building constitutive model of rock based on SPH theory.Making simulation for the progress of cutting three different hardness (sturdiness coefficient )of rock to get stress changes and statistical data of carbide cutter head of pick.The results of simulation show: the body of carbide-tipped teeth were severe stress concentration ,while ，the corresponding maximum stress is between 365 ~ 628MPa， it can meet the strength requirements，so damages were caused by fatigue；The results provide the theory basis for studying wreck and improving the woking life of pick.
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