(to be submitted for journal publication)
K. Park , G.H. Paulino and J.R. Roesler
Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Newmark Laboratory, 205 North Mathews Avenue, IL 61801, U.S.A.
Abstract
Abstract: A novel potential function for mixed-mode cohesive fracture is proposed in conjunction with macroscopic fracture parameters such as fracture energies, cohesive strengths and shape of cohesive interactions. Since these fracture parameters are based on the different fracture mode, i.e. mode I and mode II, the proposed potential characterizes the different fracture energies and cohesive strengths in the mode I and mode II fracture. The potential is also applicable to various materials, i.e. ductile, brittle and quasi-brittle materials due to shape parameters. Additionally, initial slope indicators are introduced to control or eliminate elastic behavior for numerical implementations of cohesive surface elements. The proposed potential is verified and validated by simulating the mixed-mode bending test and the four-point shear beam test.
Keywords: Mixed-mode fracture, potential, cohesive zone modeling.