Simulation of crack propagation in HTPB propellant using cohesive zone model

A crack in HTPB propellant grain can have a significant effect on the normal work of a rocket motor. In order to accurately simulate the crack propagation in propellant, a power law rate-independent cohesive zone model (CZM) is employed in a finite element simulation. Cohesive parameters are determined by experiments and an inverse/identification method. Its capability to predict the crack trajectory is demonstrated by a mixed mode fracture simulation. A rate-dependent CZM is presented to analyze the rate effects during the crack propagation of HTPB propellant, and the simulated load displacement curves agree with the experimental data. (C) 2012 Elsevier Ltd. All rights reserved.