Research on Crack Propagation of Nitrate Ester Plasticized Polyether Propellant: Experiments and Simulation

To understand the fracture properties of the nitrate ester plasticized polyether (NEPE) propellant, single-edge notched tension (SENT) tests were carried out at room temperature (20 °C) under different tensile rates (10-500 mm/min). The mechanical response, crack morphology, evolution path, and crac...

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Bibliographic Details
Published in:Materials 2024-05, Vol.17 (10), p.2180
Main Authors: Liu, Hanwen, Wang, Jiangning, Fu, Xiaolong
Format: Article
Language:English
Subjects:
Aluminum
Cameras
Composite materials
Crack initiation
Crack propagation
Finite element analysis
Fracture toughness
High speed cameras
Mechanical analysis
Mechanical properties
Morphology
Numerical analysis
Propagation
Propagation velocity
Room temperature
Simulation
Solid propellant rocket engines
Stress intensity factors
Tension tests
Viscoelasticity
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Summary:To understand the fracture properties of the nitrate ester plasticized polyether (NEPE) propellant, single-edge notched tension (SENT) tests were carried out at room temperature (20 °C) under different tensile rates (10-500 mm/min). The mechanical response, crack morphology, evolution path, and crack propagation velocity during the fracture process were studied using a combination of a drawing machine and a high-speed camera. The mode I critical stress intensity factor was calculated to analyze the tensile fracture toughness of the NEPE propellant, and a criterion related to was proposed as a means of determining whether the solid rocket motors can normally work. The experimental results demonstrated that the NEPE propellant exhibited blunting fracture phenomena during crack propagation, resulting in fluctuating crack propagation velocity. The fracture toughness of the NEPE propellant exhibited clear rate dependence. When the tensile rate increased from 10 mm/min to 500 mm/min, the magnitude of the critical stress intensity factor increased by 62.3%. Moreover, numerical studies based on bond-based peridynamic (BBPD) were performed by modeling the fracture process of the NEPE propellant, including the crack propagation speed and the load-displacement curve of the NEPE propellant. The simulation results were then compared with the experiments.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17102180