Application of TTSP to non-linear deformation in composite propellant. Issue 1 (2nd January 2018)

• Record Type: Journal Article
• Authors: Jinsheng, Xu; Hongli, Wang; Xiaohong, Yang; Long, Han; Changsheng, Zhou
• Is Part Of: Emerging materials research. Volume 7:Issue 1(2018)
• Page Start: 19
• Page End: 24
• Publication Date: 2018-01-02
• Subjects: composite materials -- mechanical properties -- stress; Materials -- Periodicals; 620.11
• DOI: 10.1680/jemmr.16.00069
• Languages: English
• ISSNs: 2046-0147

Abstract

Abstract : A series of constant-rate tensile tests and relaxation tests were conducted to assess the mechanical properties of the hydroxy-terminated polybutadiene (HTPB) propellant. The relaxation modulus master curve was acquired using relaxation tests at the linear viscoelastic segment, and stress-reduced time master curves at different strain levels were established to determine whether the time–temperature superposition principle (TTSP) could be used to assess the non-linear mechanical property of the HTPB propellant. Results showed that the mechanical properties of HTPB propellant strongly depend on temperature; the extent of this dependence is enhanced with decrease in temperature, and the TTSP can be used in non-linear segments. With the application of the TTSP, the ultimate strength and the stress–strain curves of constant-rate tensile tests can be predicted at any temperature and strain rate, and the predicted σ – ε responses matched the test results closely, but led to some errors at high temperatures, this is because of some errors in the time–temperature shift factors.