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Solid Propellant Structural Test Vehicle, Cumulative Damage, and Systems Analysis

Solid Propellant Structural Test Vehicle, Cumulative Damage, and Systems Analysis
Author: H. Leeming
Publisher:
Total Pages: 378
Release: 1968
Genre:
ISBN:

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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).


Solid Propellant Structural Test Vehicle and Systems Analysis

Solid Propellant Structural Test Vehicle and Systems Analysis
Author: H. Leeming
Publisher:
Total Pages: 294
Release: 1970
Genre:
ISBN:

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This report covers the second year of a program for the development of instrumented Structural Test Vehicles (STVs) and systems analysi for solid propellant motor design. The work follows that described in AFRPL-TR-68-130. This report supplements and uses data given in that earlier report. Additional data for 0064-61E propellant, Solithane 113 elastomer, and a new inert propellant are detailed. The problems of STV grain analysis, gage-grain interaction, and gage output interpretation, i.e., calibration techniques, also are covered. Nonisothermal grain analysis remains the largest problem area. Failure prediction for STVs and inert analog motors is discussed. Predictions are based on conventional techniques, fracture mechanics, and cumulative damage approaches. STV test data are presented for isothermal pressurization, slow cooling and heating, and transient or temperature cycling conditions. Data include failure tests on STVs and inert analog motors. Details of a new STV also are presented. The data are compared with analytical predictions to show that despite improved analyses and extensive propellant characterization, predictions of grain stresses and failure leave much to be desired. Further work is described on methods of applying systems analysis to motor design. The relation of engineering parameters to propellant chemistry is reviewed, and further work is described on an interaction analysis of material properties, motor design, and mission parameters. (Author).


Solid Propellant Cumulative Damage Program

Solid Propellant Cumulative Damage Program
Author: K. W Bills (Jr)
Publisher:
Total Pages: 322
Release: 1968
Genre:
ISBN:

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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).


Structural Failure Analysis and Prediction Methods for Aerospace Vehicles and Structures

Structural Failure Analysis and Prediction Methods for Aerospace Vehicles and Structures
Author: Sook-Ying Ho
Publisher: Bentham Science Publishers
Total Pages: 194
Release: 2010
Genre: Technology & Engineering
ISBN: 1608050246

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This book deals with structural failure (induced by mechanical, aerodynamic, acoustic and aero-thermal, loads, etc.) of modern aerospace vehicles, in particular high-speed aircraft, solid propellant rocket systems and hypersonic flight vehicles, where structural integrity, failure prediction and service life assessment are particularly challenging, due to the increasingly more demanding mission requirements and the use of non-traditional materials, such as non-metallic composites, in their construction. Prediction of the complex loading environment seen in high-speed operation and constitutive / fracture models which can adequately describe the non-linear behaviour exhibited by advanced alloys and composite materials are critical in analyzing the non-linear structural response of modern aerospace vehicles and structures. The state-of-the-art of the different structural integrity assessment and prediction methodologies (including non-destructive structural health monitoring techniques) used for the structural design, service life assessment and failure analysis of the different types of aerospace vehicles are presented. The chapters are written by experts from aerospace / defence research organizations and academia in the fields of solid mechanics, and structural mechanics and dynamics of aircraft, rocket and hypersonic systems. The book will serve as a useful reference document containing specialist knowledge on appropriate prediction methodologies for a given circumstance and experimental data acquired from multi-national collaborative programs.


Cumulative Damage and Crack Growth in Solid Propellant. Phase I.

Cumulative Damage and Crack Growth in Solid Propellant. Phase I.
Author:
Publisher:
Total Pages: 31
Release: 1997
Genre:
ISBN:

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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.