The Analysis of Stress Strain from Voids in Solid Propellant
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Abstract
The strength of the HTPB base propellant was estimated by plotting the master curve, which obtained from the solid fuel uniaxial tensile test. The plotting master curve of stress strain and Young’s modulus can be used to evaluate the strength when the propellant are subjected to different loads. One of the problems encountered in the production of propellant is the formation of voids in the propellant, which affect load. In this work, the stress strain in the propellant was analyzed using the finite element method. The result of analysis in case of high temperature 60 C considers the maximum strain from voids. It was found that the strain was below the maximum value. That is, the effect of temperature and voids did not damage the propellant. In the case of the pressure inside the rocket motor, the strain of the propellant remains at an acceptable level. The
case of rocket acceleration, an acceleration of 70 g, the stress below the maximum value where the safety factor is 1.3 that is, in this case, the acceleration of the rocket rather affects the propellant. However, even though there is a problem with voids, propellant can still hold its shape without damage, which causing the rocket to malfunction.
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