Carlton, C. H.
Most widely held works by C. H Carlton
Application of Fracture Mechanics to Predicting Failures in Solid Propellants ( Book )
1 edition published in 1970 in English and held by 1 library worldwide
Analytical and experimental methods were developed to measure the structural and fracture properties of a linear elastic epoxy and a linear viscoelastic polyurethane material (Solithane). These properties were used in stress and fracture analysis to predict the initiation, growth, and trajectory of cracks in circular port and star grain designs. Experimental confirmation of these predictions was obtained by testing thin two-dimensional (plane stress) and three-dimensional grains of both materials under thermal and pressurization loading conditions. Crack initiation conditions with the epoxy material were in excellent agreement with theoretical predictions using elastic numerical analysis methods. Crack initiation and velocity measurements with the Solithane two-dimensional grains were in good agreement with numerical analysis techniques combined with a time-dependent crack analysis which was programmed for efficient use. An approximate three-dimensional fracture analysis for circular port grains with elliptical flaws was developed and programmed. Results of the crack prediction computer program were in good agreement with three-dimensional grain test data. Experimental work with the epoxy and Solithane grains showed that cracks in two- and three-dimensional grains will propagate under thermal and pressurization loading conditions and these fracture conditions can be predicted using analytic methods presented in this report. Photoelastic analysis was used to confirm the stress intensity factors at the crack tip for thermal and pressurization loaded grains. Photoelastic results were in good agreement with both the numerical predicitons and the crack velocity measurements with Solithane grains. (Author).
Solid Propellant Nonlinear Constitutive Theory Extension ( Book )
1 edition published in 1984 in English and held by 1 library worldwide
This report includes the Phase I preliminary study in which the Quinlan theory was critiqued, alternate approaches were studied and detailed research planning accomplished. Also included are detailed experimental evaluations of propellant during Phases 2 and 3, the uniaxial/isothermal investigation and the two-dimensional variable temperature investigation. The report also covers the validation of the accuracy of the constitutive theory in a three-dimensional state of stress and strain. Detailed subcontractor theoretical development and predictions are given.
Case Liner Bond Analysis ( Book )
1 edition published in 1974 in English and held by 1 library worldwide
A second generation finite element computer code was developed with specialized features for accurate evaluation of solid propellant case liner bond regions. The code uses six-term quadratic elements for propellant modeling, special thin liner elements for liner and insulation modeling, and a crack tip element for modeling boots and cracked regions. Mesh generation is automated with variable density spacing and input format is optimized for minimum labor during problem setup. The code contains a rezone feature for selective refining of specific high stress gradient regions and rerunning for maximum accuracy. This new computer code was made available to the solid propellant industry at a computer users course in October 1973. (Modified author abstract).
Inert Carrier Process Application to HMX Nitrolysis and Recrystallization. Volume II. HMX Recrystallization ( Book )
1 edition published in 1976 in English and held by 1 library worldwide
Feasibility of recrystalling HMX in the CSD ICP pilot plant using the solvent/nonsolvent precipitant technique has been shown. Water wet HMX with .3-percent acetic acid, representative of crude HMX from the Bachman process, has been dissolved and recrystallized as the beta polymorph meeting military specifications for size and purity. HMX classes 1 and 5, of interest in this contract, were obtained; however, class 4 was not made. HMX classes 2 and 6 as well as some above the class 1 size were made during the process variables studies. These variables included (1) solvents and nonsolvents in varying ratios. (2) temperature, (3) filtration and washing capability, (4) crystal growth and nucleation variables, (5) occluded inpurities, and (6) HMX concentration in solvent recycles. Teflon lined, teflon coated, and high nickel stainless steels were found to be suitable construction materials. Teflon was the preferred seal material; however, silicone O-rings, in locations where Teflon was unusable, were found to be a short term solution. (Author).