Fracture Theory and Crack Propagation Test of Asphalt Mixture Pre-Notched Beam Based on Weight Function Method

Abstract

To investigate the stress state and crack propagation of asphalt surface course bottom, the weight function of a rectangular plate with a single edge crack is derived based on weight function method. The I-II mixed-mode stress intensity factor (SIF), mixed-mode fracture criterion, and propagation law of crack in asphalt mixture, are studied based on the test model of pre-notched beam and three-point bending test of a single-edged notched beam. Results show the following findings: (1) under the same load, with the notch close to the loading point, SIF and the maximum energy release rate of mode I increases while SIF and the fracture angle of mode II decrease; (2) the longer the notch is, the higher the maximum energy release rate becomes and the easier the beam cracks; (3) the mixed-mode cracking appears in the case of an asymmetric notch, and the initial cracking load increases with the increase of notch offset distance. Comparing these results shows that the weight function method exhibits precision in calculating the crack SIF of the beam.