Papers by Keyword: Fracture Damage

Abstract: To study the fatigue life of asphalt pavement under traffic loads, a 3-D finite element analysis (FEA) Visio-elastic road model was established on the layered theory with ANSYS software. The fatigue damage was calculated with the maximum horizontal tensile strain of asphalt layer bottom based on the fatigue fracture mechanics, when single axis went across. Then the fatigue life was obtained after the fatigue damage occurred in some degree by the Miners linear cumulative damage rule. The results show that it taken 3.4 years when the damage area reached 10% of wheel path area, and 4.5years when reached 45%; while the calculated result was 5.5 years by axial-load conversion method. The analysis shows that the fatigue life of asphalt pavement calculated by fatigue fracture mechanics rule has more significance in practice.

Abstract: A large-diameter trapezium percussive drill modeling is made by finite element modeling software and a computer simulation study of the drill is carried out in this paper. By a drop test analysis, the stress changes of each trapezoid faces is showed and the the larger stressed places are found out in this paper.The larger stressed places are easy to be fracture damaged.The beneficial theory basis will be provided by this simulation for the structural optimization of large-diameter percussive drill.