Lower bounds on deformations of dynamically loaded rigid-plastic continua
Impulsively loaded rigid plastic continua deformation lower bounds calculation, considering beams and plates
Morales, W. J.↗
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Results for “PLASTICITY”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Low-cost molded plastic sounding rocket motors
Sounding rockets motors with integrally molded plastic case and nozzle, discussing cost effectiveness and demonstration tests
Ward, J. C., Jr.↗
Stress analysis of thin elasto-plastic shells
Stress analysis of thin elastoplastic shells with large displacements loaded into strain hardening range, assuming plastic strain incompressibility
Hyman, B.↗
The effect of electrons, protons and ultraviolet radiation on plastic materials
Electron, proton and UV irradiation effects on CdS solar cell protective plastic films with or without adhesive coatings, measuring transmission changes
Anagnostou, E.↗
Calibration of plastic track detectors for use in cosmic ray experiments
Plastic track detectors calibration for heavy charged particles in cosmic ray experiments, considering track etching rates as function of particle charge and velocity
Blanford, G. E., Jr.↗
Plastic buckling of point-loaded spherical shells
Thin spherical roller supported domes stability and axisymmetric deformation under apex point loads, investigating plastic buckling and inelastic strain effects
Roberts, S. B.↗
Track etching parameters for plastics
Etchant type, concentration and temperature effect on various plastics track etching ratio and sensitivity
Blanford, G. E., Jr.↗
Cosmic-ray tracks in plastics - The Apollo helmet dosimetry experiment
Heavy cosmic ray nuclei track counts in plastics, examining Apollo mission 8 and 12 helmets
Comstock, G. M.↗
A numerical procedure for calculating stress and deformation near a slit in a three- dimensional elastic-plastic solid
Three dimensional elastic plastic solid, calculating stress and deformation with finite difference procedure
Ayres, D. J.↗
Large plastic strains in sheet-bending
Large plastic strains in fiber in sheet bending for wide angle range, using Hill theory
Yeh, G. C. K.↗
Plastic behavior of some composite materials
Two phase fiber reinforced composites under polyaxial stresses, predicting plastic behavior by deformation theory
Huang, W.-C.↗
On the postbuckling behavior of imperfection- sensitive structures in the plastic range
Axisymmetric plastic deformation of imperfection sensitive spherical shell after elastic buckling, considering load carrying capacity
Hutchinson, J. W.↗
Use of thin plastic films at cryogenic temperatures
Commercially available plastic film materials that remain flexible at cryogenic temperatures and resist failures caused by folds and wrinkles created during expulsion were investigated for use in expulsion bladders for liquefied gases. Compatible adhesive systems, fabrication techniques, and results of impact and dynamic loading tests are summarized.
Lark, R. F.↗
Built-in bleeder system in laminated plastic structures
Method is described for interplying resin absorbing, glass bleeder cloth with the layup for fabricating laminated nonflammable plastic structures with wrinkle-free surfaces.
Aguilar, A. G.↗
Plastic set of smooth large radii of curvature thermal conductance specimens at light loads
Thermal contact conductance test data at high vacuum were obtained from two Armco iron specimens having smooth, large radii of curvature, convex, one-half wave length surfaces. The data are compared with calculations based on two macroscopic elastic deformation theories and an empirical expression. Major disagreement with the theories and fair agreement with the empirical expression resulted. Plastic deformation of all the contacting surfaces was verified from surface analyzer statistics. These results indicate that the theoretical assumption of macroscopic elastic deformation is inadequate for accurate prediction of heat transfer with light loads for Armco iron specimens similar to those used in this investigation.
Mckinzie, D. J., Jr.↗
High Z particle Apollo astronaut dosimetry with plastics
On Apollo missions, the individual astronauts' high Z particle exposure is measured by means of Lexan polycarbonate plastic. These layers form one component of the passive dosimetry packets worn in the constant wear garment. They serve as threshold type, high Z, charged particle track detectors, recording only the very highly ionizing particles. The detectors yield information on the particles' charge, energy, and direction of travel. This data, in turn, is used to obtain the track fluence, the stopping particle density as an integral Z distribution, and the particles' integral LET spectrum. Some of the data gathered on Apollo missions 8-13 is presented.
Benton, E. V.↗
Investigation of hazards associated with plastic bonded starter mix manufacturing processes
An investigation to determine the hazards potential evaluation of plastic bonded starter mix (PBSM) production processes and the application to the M18 and M7A3 grenades is reported. The investigation indicated: (1) the materials with the greatest hazards characteristics, (2) process operating stations most likely to initiate hazardous conditions, (3) the test program required to examine ignition characteristics and process hazards, and (4) the method of handling the accumulated information from testing and safety analyses.
Source record↗
Comparison of NASTRAN and STARDYNE static analysis of a graphite fiber reinforced plastic truss structure
A static and buckling analysis of the ATS-F&G spacecraft reflector support truss (RST) and bridge truss assembly using NASTRAN was conducted. The RST is fabricated from a new material, graphite fiber reinforced plastic. A comparison is made with the NASTRAN results and the results of a similar analysis conducted using the stardyne program. The results of an actual static load test are also compared.
Honeycutt, G. H.↗