Based on the Hertz elastic impact theory and Thornton elastoplastic hypothesis,the theoretical expression of indenta-tion hardness during particle impact on carbon layer was derived.A critical velocity model was proposed based on convergent tube experiment data and scanning electron microscopy analysis of specimens.Combined with the crack erosion theory,a porous carbon-ized layer body ablation calculation model under two phase fluid incompletely elastic collision is proposed for the porous carbonized structure formed by the ablation of EPDM rubber.A simulated solid rocket motor rotation test was designed to verify the calculation model above,which could eliminate the discrepancy between the ground simulated motor and the real motor working in air.The test results show that the calculated results are in good agreement with the measured results under the thermal environment which simu-lating the real flight process.The research results of this paper have engineering guidance significance for the design of insulation structure of solid rocket motor.
Hertz elastic collision theoryparticle erosionEPDM insulationrotary overload testconsistency of air and ground
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