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Why are HY steels preferred for rocket motor casings-SolutionIn most o.docx
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design, failure analysis and optimization of a propeller shaft for heavy duty...design, failure analysis and optimization of a propeller shaft for heavy duty...
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Why are HY steels preferred for rocket motor casings-SolutionIn most o.docx

  1. Why are HY steels preferred for rocket motor casings? Solution In most of thel rocket vehicles, the payload represents a very small fraction of the overall vehicle mass at launch, most of the mass consisting of propellant and engine structure. Because any required engine structure must be lifted into orbit along with the intended payload, any increase in engine structure mass requires an increase in the amount of propellant used to launch the vehicle. Engine structure is essentially payload that the engines must lift. Because of this, a rapid increase in the amount of fuel required, and hence the overall rocket thrust required, occurs as engine mass increases. A rocket with the lightest possible structure is desirable, so that the maximum fraction of the total vehicle will consist of useful payload and propellant, rather than supporting structures. These structures, such as engines and mechanical connections, are essentially deadweight.So this is desirable to minimize the mass of support structure in the rocket vehicle. Specifically, high internal temperatures and pressures are needed for proper combustion and efficient thrust in a typical solid rocket motor. So HY steel is desirable.
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