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Showing papers by "Defence Research and Development Laboratory published in 1983"


Journal ArticleDOI
TL;DR: In this article, a Lagrange-type formulation for finite element analysis of non-linear vibrations of immovably supported beams is presented and two equations of motion coupled in axial and transverse displacements are derived by using Lagrange's equations.

73 citations



Journal ArticleDOI
TL;DR: In this paper, the rate-detg. stage of double-base propellants with double base double-barrel double-expander was analyzed and the authors found that diffusion of nitroglycerin [55-63-0] takes place at 120-160 and cleavage of the C-O bond is followed by a considerable decompn.
Abstract: Thermogravimetric studies were carried out with double-base propellants to find the rate-detg. stage and to understand the mechanism. The decompn. process can be divided into 3 stages as follows: diffusion of nitroglycerin [55-63-0] takes place at 120-160. Two processes occur at 170-205, namely the dissocn. of nitroglycerin and the cleavage of the C-O bond, the later being the rate-detg. step. The cleavage of the $C-O$ bond is followed by a considerable decompn. of nitrocellulose [9004-70-0].

8 citations


Journal ArticleDOI
TL;DR: In the case of polystyrene (PS)/ammonium perchlorate (AP) propellants, it was inferred from the earlier studies that condensed phase reactions contribute significantly to the total combustion process at ambient pressure.
Abstract: A Knowledge of the role of condensed phase reactions vis-a-vis gas phase reactions in the combustion of a propellant is essential in formulating models for combustion. The salient features of the role of condensed phase reactions in the combustion of solid composite propellants have recently been reviewed by Kishore.1 Briefly, in the case of polystyrene (PS)/ammonium perchlorate (AP) propellants it was inferred from the earlier studies that condensed phase reactions contribute significantly to the total combustion process at ambient pressure.