The Poisson's ratio of solid rocket motor propellant grain,which is under ambient pressure during low temperature ig-nition,is dynamic with the increase of pressure.In order to investigate the variation of Poisson's ratio with ambient pressure,a rapid pressure experiment system was carried out.The function form of the results was obtained by the equivalent relationship of volume deformation.The grain structural integrity of a tube and star solid rocket motor in the ignition and the pressure process was analyzed by three-dimensional viscoelastic finite element method,while the USDFLD subroutine of ABAQUS was used to load the variable Poisson's ratio function.The experimental and simulation results indicated that the increase of pressure would cause the internal po-rosity of the HTPB composite solid propellant to crease,and the Poisson's ratio would present a nonlinear increasing trend with the pressure process.There were differences between the simulation results of variable Poisson's ratio and constant Poisson's ratio.The maximum principal strain of variable Poisson's ratio grain was significantly higher than that of constant Poisson's ratio at low ignition pressure.
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