Structural Integrity Assessment of an NEPE Propellant Grain Considering the Tension–Compression Asymmetry in Its Mechanical Property
Open Access
Abstract
In order to investigate the effect of tension–compression asymmetry of propellant mechanical properties on the structural integrity of a Nitrate Ester Plasticized Polyether (NEPE) propellant grain, the unified constitutive equations under tension and compression were established, a new method for grain structural integrity assessment was proposed and the structural integrity of the NEPE propellant grain under the combined axial and transverse overloads was evaluated. The results indicate that the mechanical state of the NEPE propellant grain is in the coexistence of tension and compression under the combined axial and transverse overloads, and the tension and compression regions in the propellant grain is independent of the propellant constitutive behavior. The tension–compression asymmetry of the propellant mechanical properties has a certain impact on its mechanical response. The maximum equivalent stress and strain considering the tension–compression asymmetry falls between that obtained through the tension and compression constitutive model, and is the same as damage coefficient. The safety factor of the NEPE propellant grain considering the tension–compression asymmetry of its mechanical properties is larger than that non-considering, and the traditional method of structural integrity assessment is conservative.Keywords
This publication has 19 references indexed in Scilit:
- A stabilized complementarity formulation for nonlinear analysis of 3D bimodular materialsActa Mechanica Sinica, 2015
- Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rateJournal of Applied Polymer Science, 2015
- Development of efficient finite elements for structural integrity analysis of solid rocket motor propellant grainsInternational Journal of Pressure Vessels and Piping, 2013
- Finite elasto-viscoplastic modeling of polymers including asymmetric effectsArchive of Applied Mechanics, 2012
- A review on the research of mechanical problems with different moduli in tension and compressionJournal of Mechanical Science and Technology, 2010
- Convergence analysis of a finite element method based on different moduli in tension and compressionInternational Journal of Solids and Structures, 2009
- Numerical finite element formulation of the Schapery non‐linear viscoelastic material modelInternational Journal for Numerical Methods in Engineering, 2003
- A micromechanical constitutive framework for the nonlinear viscoelastic behavior of pultruded composite materialsInternational Journal of Solids and Structures, 2003
- A constitutive formulation for high-elongation propellantsJournal of Spacecraft and Rockets, 1983
- Effects of material nonlinearity and failure criteria upon solid-propellant integrity.Journal of Spacecraft and Rockets, 1966