| Minuteman III, Stage III Surveillance |
JAN 86 |
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| Authors:
Ralph Davis; L. C. Porter Jr; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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 | The program effort during this reporting period consisted of laboratory testing of both the Morton Thiokol, Inc./ASPC Minuteman III Third Stage Surveillance components and material samples. In addition, bondline aging testing and analysis using samples from previously dissected motors were accomplished. In support of the program, all flight and static tests, for both First and Third Stage Minuteman motors, were reviewed and tabulated for incorporation into reliability and motor historical ... |
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| Braided Carbon/Carbon Nozzle Development |
08 JUL 1985 |
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| Authors:
A. R. Canfield; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| This paper discusses the development of an advanced carbon-carbon material and its application for solid rocket motor nozzles. In 1981, a 2-D carbon/carbon exit cone was successfuly tested, but the materials lacked axial stiffness and exhibited low interlaminar strengths. As A consequence, a new 4-D braided material has been developed which involves continuous braided plies with integral axial fibers and radial carbon fiber elements. Material characterization tests show the material ... |
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| Thermal Modeling |
08 JUL 1985 |
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| Authors:
R. C. Bunker; d. s. nelson; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| A computer model has been developed that simulates the transient temperature response of a tape-wrapped carbon-cloth-phenolic rocket nozzle part during hydroclave cure. The model accounts for the thermal energy released during the exothermic condensation reaction that is characteristic of phenolic resins undergoing cure. Excellent agreement between predicted and measured temperature response was obtained at several thermocouple locations in each of four Space Shuttle solid rocket motor (SRM) nozzle inlet rings ... |
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| Spacecraft Contamination From Scarfed Nozzle Exhaust |
08 JUL 1985 |
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| Authors:
S. Boraas; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| A rocket operating in a vacuum environment will produce a molecular flow which is directed into the nozzle backflow region. This paper discusses the development and application of an analytical model which describes this flow and provides a means of predicting the exhaust-plume contamination from a scarfed nozzle. The model is an adaptation of a previously developed model for a conventional unscarfed nozzle. It is based upon the exixtence of ... |
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| Design Evolution of the Space Shuttle Solid Rocket Motor |
08 JUL 1985 |
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| Authors:
A. J. Mc Donald; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| The design requirements established for the development of the Space Shuttle solid rocket motors (SRMs) were very demanding and included three very new and unique features: first solid propulsion system to be used for manned space flight; largest solid rocket motor to be flown, and first solid propulsion system designed to be recovered and reused. It was these 'new' features that dictated that 'old' established technology and manufacturing approaches be ... |
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| Refurbishment of Space Shuttle SRM Nozzles |
08 JUL 1985 |
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| Authors:
P. Ross; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Refurbishment considerations were designed into nozzle hardware to support the concept of keeping the cost per Shuttle flight to a minimum. Since these nozzle parts are large and are machined from aluminum and steel forgings, they are relatively high-cost. Consequently, if they can be reused, a significant savings can be realized. All nozzle metal parts were designed for 19 reuses, while the flexible bearing was designed for 9 reuses. These ... |
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| Consumable Light-Weight Ignition System For Full Head-End Web Solid Propellant Rocket Motors |
08 JUL 1985 |
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| Authors:
C. M. White; D. Rozanski; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| This paper discusses the development of a consumable, light-weight ignition system designed to be used in full head-end web solid propellant rocket motors. It shows that results of simulator and full-scale motor tests have demonstrated a reliable, soft ignition system which is predictable, scaleable, and adaptable to various head-end web motor configurations. It presents a methodology for sizing the ignition system to meet an ignition requirement for motor port pressurization ... |
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| Predicted Post Burn Residual Thrust For An Orbital Transfer Motor |
08 JUL 1985 |
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| Authors:
S. Boraas; B. Hyland; L. Smart; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| A solid rocket motor containing an aluminized propellant will produce molten slag, a portion of which will be deposited on the inner surface of the motor near the end of the burn. After motor burnout, this slag may become a major source of heat for the production of gases due to pyrolysis of the insulation material. This pyrolytic action will create a residual thrust which, in the case of an ... |
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| Low Cost Carbon/Carbon Nozzles for Solid Rocket Motors, |
APR 1985 |
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| Authors:
F. Inman; D. Giedt; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| The technique for fabricating low cost multidimensional carbon/carbon rocket nozzle component preforms by the braiding process is discussed. The basic braiding process was extended for fabricating ITE, exit cone and ITEC components by adding integral axial and radial graphite fiber elements to the basic biaxial braid architecture. The braided fiber preform was subsequently densified by conventional techniques to obtain a composite with an orthogonal 4-D or planar 3-D fiber construction ... |
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| Use of Peel Values in Structural Analysis, |
APR 1985 |
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| Authors:
S. J. Bennett; A. W. MacBeth; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Peel values have been used extensively to evaulate the quality of a bond system but have had limited utility in structural analysis, due to the sensitivity of the peel value to material formulation changes, bond system processing, and material aging. As a practical matter, low peel values have been associated with motor failures while high peel values appear to have a desirable degree of merit; thus, peel testing is a ... |
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| Report on Kevlar -49 Composite Pressure Vessel Safety Technology Program, |
APR 1985 |
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| Authors:
D. Gleich; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| An experimental and analytic program to define the conditions under which a Kevlar -49 fiber over-wrapped metal liner prestressed composite (PSC) tank used for high pressure gas storage fails safe (if the metal liner suddenly ruptures during operation) as described. Two sudden metal liner failure modes were investigated: liner unstable brittle crack growth/rupture, and ductile stable crack growth (leak before burst) failure mode. Failure predictions under operating pressure load are ... |
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| Elastomeric Barrier Pulse Motors |
APR 1985 |
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| Authors:
Charles R. Voris; J. W. Rabern; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| The Wasatch Division of Morton Thiokol, Inc., recently completed a series of 5.5-in.-dia, elastomeric barrier, radial pulse motor tests that have been highlighted some inherent problems with the concept and have demonstrated solutions to many of them. The first test was an utter failure. The testing then included a comprehensive series of component tests in a Pulse II simulator focusing on the Pulse II barrier and ingnition design variations. This ... |
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| Factors Affecting Pi Sub K In HTPB Formulations |
APR 1985 |
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| Authors:
M. M. Roland; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| The importance of temperature sensitivity in the design and performance of tactical rocket motors manifests itself in overall motor efficiency and cost. Pressure excursions may occur if the rate of energy release exceeds limits. The maximum expected operating pressure (MEOP) may be exceeded. To provide a margin of safety, a thicker case and additional insulation becomes necessary. This preventive measure adversely affects the performance of the rocket motor and increases ... |
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| Use Of Peel Values In Structural Analysis |
APR 1985 |
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| Authors:
S. J. Bennett; A. W. MacBeth; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Peel values have been used extensively to evaluate the equality of a bond system, but have had limited utility in structural analysis. This situation arose from the sensitivity of the peel value to material formulation changes, bond system processing, and material aging and, contrariwise, to the obscure meaning of the peel value. As a practical matter, low peel values have been associated with motor failures, while high peel values appear ... |
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| Low Cost Carbon/Carbon Nozzles For Solid Rocket Motors |
APR 1985 |
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| Authors:
Frank Inman; Don Giedt; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| This paper discusses the technique for fabricating low-cost, multidimensional carbon/carbon (C/C) rocket nozzle component preforms by the braiding process. The basic brading process has been extended for fabricating integral throat/entrances (ITE), exit cone, and integral throat/exit cone (ITEC) components by adding integral axial and radial graphite fiber elements to the basic biaxial braid architecture. The braided fiber preform is subsequently densified by convetional techniques to obtain a composite with an ... |
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| Molecular Size Distribution of Nitrocellulose in XLDB Lacquer Using GPC/FT-IR (Gel Permeation Chromatography/Fourier Transform-Infrared Spectrophotometer), |
JAN 1985 |
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| Authors:
R. C. Raisor; R. D. Law; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Gel Permeation Chromatography (GPC) has become the standard technique for determining molecular size and weight distribution of soluble polymeric materials. However, when GPC is applied to mixtures containing different types of macromolecules it is difficult, if not impossible, to resolve them using conventional GPC detectors. This is true in the case of PGA/nitrocellulose mixtures. Use of a Fourier Transform Infrared Spectrophotometer (FT-IR) as a detector for the GPC offers an ... |
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| Relationship of Bita Characteristics to Liner Properties, |
JAN 1985 |
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| Authors:
R. R. Hendrickson; R. D. Law; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Many of the linear systems used by the solid propellant rocket industry for HTPB propellants contain BITA (Trimesoyl-l(2-ethyl)aziridine) as a bond enhancer. This work demonstrates that liner-propellant bonds, liner viscosities, and rheological properties correlate with the polymeric content of the BITA. Purifying BITA to reduce the polymer content produces improved bonds and better control of linear viscosity. BITA monomer is relatively stable in the liner at cure temperature, but it ... |
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| Measurements of Strain-Free Temperature and Parr End Correction Factor in Solid Propellant Grains, |
NOV 1984 |
4 pages |
| Authors:
K. W. Bills Jr.; J. A. Wilkerson; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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 | The structural analysis of a rocket motor propellant grain subjected only to thermal loads involves the fundamental assumption that a small thermomechanical reference state exists at which the grain stress and strains disappear. Substantial evidence now exists which shows that the grain stresses and strains do not necessarily vanish at the same reference state, i.e. the stress-free and strain-free temperatures are significantly different. The primary cause of the strain-free temperature ... |
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| Development of Ejector Interfaces for Air Launch Composite Motor Cases, |
NOV 1984 |
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| Authors:
Lynn C. Kummer; Edward Wolcott; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| A significant challenge in the development of composite cases for air launch applications is the integration of the missile/ejector interface fittings into the composite cylindrical section of the case. The feasibility of one concept, which utilizes an external metal lug fitting bolted through the reinforced carbon/epoxy cylinder into an internal reaction plate, was demonstrated by subjecting a full-scale (18-in) diameter cylinder to radial loads representative of ejector interface loads during ... |
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| Computerized Data Acquisition for Testing Composite Materials, |
NOV 1984 |
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| Authors:
David C. Suisse; Ronn L. Carpenter; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Until recent years, testing of composite materials was difficult if monitoring multiple channels of instrumentation was required. Computer systems have greatly simplified the task of data acquisition and reduction and allow more complex test set-ups to be monitored. This paper describes two computerized data acquisition systems used for monitoring composite materials tests and the software developed for data reduction and graphic presentation. |
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| Methods for Energy Release Rate Calculation, |
NOV 1984 |
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| Authors:
G. P. Anderson; L. P. Abrahamson; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| This paper compares four methods for obtaining fracture mechanics parameters from finite element computer programs. Total energy release rate values are obtained using numerical differentiation, crack closure integral, modified crack closure integral, and crack opening displacements. A commonly used method, numerical differentiation of strain energy, does not yield the correct energy release rate when displacement and traction loads are applied simultaneously. The authors found that the relatively new crack closure ... |
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| Tensor Polynomial Failure Theory Application |
11 JUN 1984 |
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| Authors:
B. D. Simmons; W. E. Bernot; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| The maximum stress theory fails to accurately describe the real interlaminar strength of laminated composite components in multiaxial stress fields indigenous to a solid propellant rocket nozzle. By making suitable assumptions, the tensor polynomial failure criterion is simplified to describe delamination of a composite material. This simplification results in an ellipse which is the intersection of the Tsai-Wu surface with the interlaminar normal-shear plane in the stress space. Intercepts of ... |
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| Carbon Pressure Vessel Performance With Changing Dome Profiles |
11 JUN 1984 |
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| Authors:
E. W. Tackett; G. A. Merrell; S. B. Kulkarni; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| A combined analytical and experimental effort was conducted to characterize dome reinforcement requirements for intermediate-modulus (30-34 msi) carbon-epoxy pressure vessels and evaluate the effects of shallow dome profiles on their performance. The study demonstrated that spiral-wound wafers are effective reinforcements to prevent boss blowout. Also, cabon, because of its superior stiffness-related properties over other fibers, allows low-dome-profile pressure vessel designs wherein dome failure becomes compressive-buckling-related. Although th etest indicated that ... |
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| Solid Rockets - An affordable solution to future space propulsion needs |
11 JUN 1984 |
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| Authors:
A. J. McDonald; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| The role of the Department of Defense (DOD) in providing military capability in space requires the development of unique and advanced propulsion systems to meet these challenging missions. Improved propulsion systems will be needed for launch vehicles, as well as orbit transfer vehicles (OTVs), to satisfy future military missions in space. Examination of current and advanced solid rocket propulsion technology indicates that solid rocket motors can satisfy most of these ... |
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| High Energy Binders |
21 JUN 1983 |
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| Authors:
MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Research efforts have continued in the areas of monomer synthesis, including non-energetic monomers for the thermoplastic elastomers, polymer synthesis, and polymer characterization. Also initiated were the determination of reactivity ratios of new monomers and the thermal depolymerization/ decomposition of polyethers by thermogravimetric analysis. Two new monomers were synthesized during this reporting period for use in imparting internal plasticization to poly(THF). The first, 3-octoxymethyl-3-methyl-oxetane (OMMO) was readily prepared in high yield ... |
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| Polycyclic High Energy Oxidizers |
APR 1983 |
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| Authors:
J. C. Hinshaw; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| Efforts toward the synthesis of polycyclic high density, high energy oxidizers have involved examination of synthetic paths to the hexaazaadamantane framework. Routes examined include condensation of amides with an orthoformate, reaction of tris(acylamino) methanes with orthoformate and cylizations based on acylated perhydrotriazines. The cyclization chemistry of a pentaazabicyclononadiene is also under investigation. (Author) |
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| The Identification and Safe Life Prediction of Hazardous Materials, |
02 JUN 1982 |
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| Authors:
V. Daugherty; MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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| A suitable test for measuring the relative thermal stability of propellants containing nitrate esters is important not only for production controls, but also in defining the time and temperature at which this formulation can be safely stored. Over the years a number of tests have been developed for this purpose. However, most of these methods require either too much time or too sophisticated equipment to be implemented into process control. ... |
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Reports by Corporate Author
