Joined with the kinked model , fractal dimension of crack is calculated , the theoretic model of fractal fracture toughness is proposed and is verified with the results of experiment 結(jié)合裂紋彎折擴(kuò)展模型,計(jì)算了裂紋分形維數(shù),提出了分形斷裂韌度的理論模型,并與實(shí)驗(yàn)結(jié)果進(jìn)行了驗(yàn)證。