4Xi-bing LI, Summers D A, Rupert G. Experimental investigation on the breakage of hard rock by the PDC cutters with combined action modes [ J ]. Tunnelling and Underground Space Technology 2001,16 : 107-114.
5Xi-bing LI, Summers D A, Rupert G. Investigation into the penetration and impact resistance of PDC cutters inclined at different attack angles [ J ]. Transation of Nonferrous Metals Society of China. 2001, 10(2) : 342-346.
6Lemaitre J. An equivalent strain hypothesis[ J]. J. Engng. Materials and Technology,1985, 107( 1 ) : 83-89.