Cumulative Damage And Crack Growth In Solid Propellant Phase I PDF Download
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Total Pages | : 31 |
Release | : 1997 |
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Download Cumulative Damage and Crack Growth in Solid Propellant. Phase I. Book in PDF, ePub and Kindle
This report covers results of research addressing the fracture and crack growth behavior of solid propellants in support of structural integrity methodology for the failure response of solid propellant rocket motors. The effects of damage, temperature, and strain rate on local behavior near the crack tip and crack growth behavior in solid propellants were investigated. Numerical modeling techniques were used to determine the local strain fields near the crack tip and the fracture parameters associated with crack growth. The results of both experimental and analytical analyses were evaluated and discussed.
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Total Pages | : 3 |
Release | : 2000 |
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Download Investigating Near Tip Damage and Crack Growth Behavior in a Solid Propellant Book in PDF, ePub and Kindle
The objectives of this report were to investigate the local damage mechanisms near the crack tip in a solid propellant and investigate the effects of local damage on the crack growth behavior under a constant strain rate condition.
Author | : K. W Bills (Jr) |
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Total Pages | : 322 |
Release | : 1968 |
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Download Solid Propellant Cumulative Damage Program Book in PDF, ePub and Kindle
A comprehensive laboratory and theoretical analysis program was conducted to provide increased understanding of linear cumulative damage concepts for solid propellants, with emphasis upon the statistical characteristics of propellant failure. Mechanism of damage studies on model materials showed that failure is controlled by a mechanical instability behavior in the binder, which is not a tearing process. The linear cumulative damage (LCD) relation and the maximum principal stress (MPS) failure criterion were described and shown to hold for uniaxial, strip-biaxial and triaxial (poker-chip tensile tests). The effects on the time-to-failure data were evaluated in terms of the superimposed pressure, relative humidity, statistical variability, aging and sensitivity to variations in the environmental test conditions. (Author).
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Total Pages | : 17 |
Release | : 2003 |
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Download Material Mechanics Research Book in PDF, ePub and Kindle
This report covers results of research addressing cumulative damage and crack growth behavior in a solid propellant and interfacial fracture of bi-material bonded systems. The program s basic approach involves a blend of analytical and experimental studies. In general, mechanisms and mechanics involved in cohesive fracture in the solid propellant and adhesive fracture in the bi-material bonded systems are emphasized. The results of both analytical and experimental analyses are evaluated and discussed.
Author | : James H. Lee |
Publisher | : |
Total Pages | : 96 |
Release | : 1996-09-01 |
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ISBN | : 9781423583851 |
Download Modeling of Crack Initiation and Growth in Solid Rocket Propellants Using Macromechanics and Micromechanics Theories Book in PDF, ePub and Kindle
Modeling and simulation of crack initiation and propagation in solid rocket propellant materials were conducted using both the macromechanics approach and the micro/macromechanics approach. Due to their composition, the solid rocket propellant can be construed as particle reinforced composites. The macromechanics approach entailed a numerical simulation of a finite element model to predict the crack behavior based on the damage initiation, growth, and local saturation. Its results were then compared to the experimental data. In the simulation, it was assumed that a crack forms when a damage is saturated in a localized zone. The results from the simulation were quite comparable to the experimental results, validating the method of predicting crack initiation, growth, and arrest using the concept of damage growth and saturation. The second approach involved using a simplified micromechanical model and the damage mechanics being applied at the micromechanics level and the finite element analysis being done subsequently at the macromechanics level. In using this approach, the damage modes such as matrix cracking, interface debonding and particle cracking were explainable in an explicit fundamental manner. Several simulations were conducted using this approach including the cases of non- uniform particle distribution. The predicted results compared well with the experimental data.
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Total Pages | : 15 |
Release | : 1998 |
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Download Subcritical Crack Growth in a Composite Solid Propellant Book in PDF, ePub and Kindle
Unixial tension tests using a strain rate of 0.04 in./in./min. are performed on rectangular smooth and single edge-notched specimens of varying thicknesses for a composite solid propellant. Stress strain, crack growth, crack growth rate and crack growth resistance data are provided. Thickness effects and the mechanism of crack growth are described. Methods of calculation are explained for the crack growth rate and the Mode 1 stress intensity factor. A model is developed for the crack stable growth rate as a function of the stress intensity factor. Uniaxial tension tests using a strain rate of 0.04 in. Iin./min. are performed on rectangular smooth and single edge-notched specimens of varying thicknesses for a composite solid propellant. Stress-strain, crack growth, crack growth rate and crack growth resistance data are provided. Thickness effects and the mechanism of crack growth are described. Methods of calculation are explained for the crack growth rate and the Mode 1 stress intensity factor. A model is developed for the crack stable growth rate as a functlon of the stress intensity factor.
Author | : Paul Douglas Chilton |
Publisher | : |
Total Pages | : 94 |
Release | : 1970 |
Genre | : Solid propellants |
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Download Cumulative Damage of Simulated Solid Propellant Under Dynamic Loading Book in PDF, ePub and Kindle
Author | : H. Leeming |
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Total Pages | : 378 |
Release | : 1968 |
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Download Solid Propellant Structural Test Vehicle, Cumulative Damage, and Systems Analysis Book in PDF, ePub and Kindle
This report covers a one-year program of work concerned with the development of instrumented Structural Test Vehicles (STVs), studies related to damage accumulation with propellants and studies of systems analysis as applied to solid propellant motor design. Section 2 of this report details the experimental propellant characteristization tests. Stress relaxation and failure data are given as well as the effects of storage on the propellant properties. Section 3 considers STV design and the instrumentation problem areas. Section 4 details the analytical work performed for the STV configurations and the gage-grain problem area. Two new computer programs are given and the problems of material nonlinearities are reviewed. Also, experimental STV stress-strain data are compared with the analytical predictions. Section 5 is concerned with two areas related to cumulative damage (1) the use of propellant volumetric dilatation as a damage index and (2) the calculation of transient thermal stresses. Section 6 illustrates the technique for using a systems analysis approach to rocket motor structural design problems by means of a specific example. (Author).
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Total Pages | : 500 |
Release | : 1995 |
Genre | : Aeronautics |
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Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : James S. Noel |
Publisher | : |
Total Pages | : 126 |
Release | : 1973 |
Genre | : Solid propellant rockets |
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Download Solid Propellant Grain Structural Integrity Analysis Book in PDF, ePub and Kindle