【摘要】：目的通過有限元方法計算裂紋擴展過程中裂紋尖端應力強度因子的變化和裂紋擴展的路徑。方法用ANSYS軟件建立釉牙本質(zhì)界結(jié)構(gòu)的有限元模型,在模型的單邊緣設置長度為0.1 mm的初始裂紋,該數(shù)值試樣的底端固定,頂端受有б=1 MPa的均勻拉伸載荷,加載頻率為5 Hz。利用ANSYS軟件計算裂紋在擴展過程中裂紋尖端的應力強度因子和裂紋在擴展過程中的偏斜角度。結(jié)果裂紋到達釉牙本質(zhì)界時應力強度因子會突然降低并且在釉牙本質(zhì)界內(nèi)隨裂紋的延伸而降低。裂紋在釉質(zhì)和牙本質(zhì)內(nèi)的偏斜角度小于15°,當裂紋擴展到釉牙本質(zhì)界時會出現(xiàn)大的偏斜角度,裂紋尖端出現(xiàn)應力降低的現(xiàn)象。結(jié)論由于裂紋尖端應力強度因子在釉牙本質(zhì)界處的降低以及裂紋偏斜,釉牙本質(zhì)界可能具有阻斷裂紋擴展的作用。
[Abstract]:Aim to calculate the change of stress intensity factor at crack tip and the path of crack propagation during crack propagation by finite element method. Methods the finite element model of glazed tooth boundary structure was established by ANSYS software. The initial crack with length of 0.1 mm was set on the single edge of the model. The bottom end of the numerical sample was fixed, the top was subjected to uniform tensile load of 鈮，

本文編號：2511033