Book ChapterDOI
Structural Analysis of Propellant Grains
Bernard Gondouin
- pp 215-302
TLDR
In this paper, the authors focus on the structural analysis of propellant grains and determine the induced stress or strain resulting from induced loads in the propellant grain and the allowable stress/strain.Abstract:
Publisher Summary This chapter focuses on the structural analysis of propellant grains. During their entire service life, propellants are subjected to stresses, which may cause cracks in the propellant grain or separation between the propellant and the inhibitor or the liner. During firing, there are a number of possible consequences from one of these structural failures. An analytical method allowing the determination, a priori, of the structural integrity of the propellant grains is, therefore, often considered better. The principle is simple and based on determination of two values for each loading condition. These values are the induced stress or strain resulting from induced loads in the propellant grains and the allowable stress or strain. The induced stress or strain in a propellant grain is the maximum stress or strain developed in the propellant. Each type of propellant has its own specific mechanical characteristics. The methods to determine their behavior are identical, and the influence of various parameters is also the same for all propellants. The propellant capability is the induced maximum stress or strain necessary to cause failure of the material.read more
Citations
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Journal ArticleDOI
Development of Modern Solid Propellants
TL;DR: The history of solid-propellant technology can be traced back to the first thousand years of the development of solid propellants as discussed by the authors, when the first use of blackpowder was mentioned in connection with guns, e re arrows, and other types of armaments.
Journal ArticleDOI
A review of the performance and structural considerations of paraffin wax hybrid rocket fuels with additives
TL;DR: A review of existing regression rate measurement techniques on paraffin wax based fuels and the results obtained with various additives are collated and discussed in this paper as mentioned in this paper, including 2D slab motors that enable visualisation of liquefying fuel droplet entrainment and the effect of an increased viscosity on the droplet encoder mechanism, which can occur with the addition of structural enhancing polymers.
Journal ArticleDOI
A Study on Creep Behavior of Composite Solid Propellants Using the Kelvin-Voigt Model
TL;DR: In this article, a Kelvin-Voigt model consisting of a spring and a dashpot in parallel was applied for the viscoelastic characterization of solid rocket propellants, and suitable values of spring constants and damping coefficients were employed by a least squares fit of the errors to generate creep curves using a Dynamic Mechanical Analyzer (DMA) for composite solid propellants.
Journal ArticleDOI
Determination of Activation Energy of Relaxation Events in Composite Solid Propellants by Dynamic Mechanical Analysis
TL;DR: In this article, the authors used a dynamic mechanical analyzer to characterize six different types of propellants based on hydroxyl terminated polybutadiene, aluminium, ammonium perchlorate cured with toluene diisocyanate having burning rates varying from 5mm/s to 25 mm/s at 7000 kPa Each propellant sample was given a multi-frequency strain of 001 percent at three discrete frequencies (35 Hz, 11 Hz, 35 Hz) in the temperature range -80 °C to + 80 °C
References
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Journal ArticleDOI
The Temperature Dependence of Relaxation Mechanisms in Amorphous Polymers and Other Glass-Forming Liquids
Book ChapterDOI
Cumulative damage in fatigue
TL;DR: The aircraft designer today is faced with the necessity of estimating not only the strength of a structure, but also its life — a task with which he was not confronted before.
Journal ArticleDOI
A theory of crack initiation and growth in viscoelastic media
TL;DR: In this paper, a theory is developed for predicting the time-dependent size and shape of cracks in linearly viscoelastic, isotropic media, and a local energy criterion of failure at the tip is introduced, which is applicable to both constant and transient tip velocities.