Affiliation:
1. Nanjing University of Science and Technology
Abstract
The fracture toughness of HTPB propellant has a significant rate effect. In order to establish a fracture criterion considering rate effect for HTPB propellant, experiments were conducted at different loading rates. Two kinds of specimens were used to get the fracture properties. Stress intensity factor and J-integral were obtained by the single edge notched tension specimen test. A power law cohesive zone model was obtained by the experiment based inverse method. Through comparing we found that the stress intensity factor and J-integral cannot model the rate effect in fracture process. The cohesive zone model (CZM) has a constant critical separation distance at different loading rates and has a capability to model the rate effect during the crack initiation and propagation process. A finite element simulation in ABAQUS was given to demonstrate its capability to model the crack propagation.
Publisher
Trans Tech Publications, Ltd.
Reference8 articles.
1. A.S. Rao, Y. Krishna and B. Nageswara: Materials Science and Engineering A, Vol. 385 (2004) No. 1-2, p.429.
2. C.T. Liu and C.W. Smith: Experimental Mechanics, Vol. 36 (1996) No. 3, p.290.
3. C.T. Liu: Mechanics of Time-Dependent Materials, Vol. 1 (1997) No. 1, p.123.
4. R.A. Schapery: International Journal of Fracture, Vol. 11 (1975) No. 1, p.141.
5. M.N. Abdelaziz, R. Neviere and G. Pluvinage: Engineering Fracture Mechanics, Vol. 31 (1988) No. 6, p.1009.