Accelerated Aging Tests of HTPB-Based Propellants

Accelerated Aging Tests of HTPB-Based Propellants

Roberta Jachura Rocha (Aeronautics Institute of Technology, Brazil)
Copyright: © 2018 |Pages: 26
DOI: 10.4018/978-1-5225-2903-3.ch012
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Abstract

In the late twentieth century, liquid and solid propulsion technologies have been integrated into hybrid engines currently apllied in propulsion launch vehicles and missiles. The reaction of polyol (HTPB) and diisocyanate (IPDI) provides the most versatile of the binders in the production of solid propellants due to its ability to withstand high loads combined with low cost and ease of processing. A propellant based on HTPB obtained in this study was submitted to natural and accelerated aging tests, seeking to evaluate the modifications of mechanical properties as tensile strength, elongation and hardness up to 360 days. The mechanism considered in the aging process is the increase of crosslink density by breaking the double bond contained in the HTPB molecule, which causes the instability of the propellant, increasing its handling risk. Samples of these propellants subjected to aging presented variations in their properties that match the values available in the literature.
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Introduction

Propulsion Systems Operation

Propulsion by rocket engines followed two distinct paths throughout the twentieth century. One, according to Tsiolkovsky's view in Russia, Goddard's in the United States, Esnault-Pelterie's in France, and Oberth's in Germany, understood that rocket propulsion was the key to accessing outer space, and for the consolidation of space travel, we opted for rocket propellant (MFPL) propulsion because of its superior performance when compared to solid propellant rocket propulsion (MFPS) propulsion. The other route in which it followed the propulsion by rocket motors was towards the development of the systems of armaments, in which the propulsion was adopted by motor rocket to solid propellant. It was decided to use the MFPS based on the need to combine good performance with the other characteristics provided by this propulsion model, such as the possibility of immediate use, its compact dimensions, lower cost and longer service life. At the end of the 20th century, liquid and solid propulsion technologies also found applications in an integrated form in launch vehicles and missiles, among others (Davenas, 2003).

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