چكيده به لاتين
Abstract:
Analysis using finite element method is one of mechanistic analysis approaches which is widely used by pavement science researchers. This method is implemented by specific-designated softwares, one of them is Abaqus. Through recent years, modeling in this software is gradually shifted from 2D to 3D systems. In this study, by the use of mentioned software, computer modeling of a 3D flexible pavement having an initial top-down crack is carried out. Two kinds of axles including "dual tandem" and "single tridem" for loading are considered in the model. Regarding various placements for both kind of loadings, I, II and III stress intensify factors (SIFs) modes, are investigated as effective parameters in investigation of top-down crack response. Furthermore, resulted outputs stemming from placement of these axles correspond to top-down crack, and their effect on SIFs on the edge of the crack are studied. Based on the results of this study, loading placement has a significant effect on the amount of SIFs of the crack. Moreover, upon fulfilled evaluations, the single tridem would produce larger SIFs than ones of dual tandem and have a greater effect on top-down crack growth.
Keywords: finite element method, top-down crack, Abaqus
