SEARCH · Engineering Papers
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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Elastic-plastic deformation theories and elastic solutions method for solving problem of stress concentration around circular hole in spherical shell
Stress concentration around holes in glass fiber reinforced plastics and other synthetic materials
Prototype erectable communications satellite of spherical design using plastic memory effect
Fabrication and testing of dovetail plastic honeycomb structures for landing shock absorbers
Multidirectional reinforced epoxy plastics in testing mechanical response to stress
Cryogenic temperature resistant plastics in space program, discussing insulation, adhesives, seals, gaskets and expulsion of cryogenic propellant in zero gravity environment
Nuclear magnetic resonance and nuclear quadrupole resonance techniques for nondestructive testing of reinforced plastics for curing and internal stresses
Discrete element method for plastic analysis of complex built-up structures subjected to cyclic loading causing membrane stress and stress reversal
Plastic deformation effect on resistivity and Hall effect of copper-palladium and gold- palladium alloys
Structural reinforced plastic composite materials for cryogenic temperature application evaluated noting tensile, compression, shear, flexural and bearing properties
Dewrinkling and diffusion mass transport mechanisms in high temperature tensile and shear plastic deformation of pyrolitic carbons
The experimental deflections and stresses of six plastic multicell-wing models of unswept, delta, and swept plan form are presented and compared with previously published theoretical results obtained by the electrical analog method. The comparisons indicate that the theory is reliable except for the evaluation of stresses in the vicinity of the leading edge of delta wings and the leading and trailing edges of swept wings. The stresses in these regions are questionable, apparently because of simplifications employed in idealizing the actual structure for theoretical purposes and because of local effects of concentrated loads.
Results are presented of tests for determining the tensile, compressive, and bending properties of a material of plastic-bonding glass cloth and canvas layers. In addition, 10 panel specimens were tested in compression. Although the material is not satisfactory for primary structural use in aircraft when compared on a strength-weight basis with other materials in common use, there appears to be potential strength in the material that will require research for development. These points are considered in some detail in the concluding discussion of the report. An appendix shows that a higher tensile strength can be obtained by changes in the type of weave used in the glass-cloth reinforcement.
The bibliography contains citations concerning analytical techniques using constitutive equations, applied to materials under stress. The properties explored with these techniques include viscoelasticity, thermoelasticity, and plasticity. While many of the references are general as to material type, most refer to specific metals or composites, or to specific shapes, such as flat plate or spherical vessels.
The bibliography contains citations concerning analytical techniques using constitutive equations, applied to materials under stress. The properties explored with these techniques include viscoelasticity, thermoelasticity, and plasticity. While many of the references are general as to material type, most refer to specific metals or composites, or to specific shapes, such as flat plate or spherical vessels. (Contains 50-250 citations and includes a subject term index and title list.)
It is reported by some users and has been demonstrated by others via testing and qualification that the quality and reliability of plastic-encapsulated microcircuits (PEMs) manufactured today are excellent in commercial applications and closely equivalent, and in some cases superior to their hemetic counterparts.
Acoustic Micro Imaging (AMI) was successfully employed by JPL Office 507 to evaluate comercial off-the shelf (COTS) plastic encapsulated microcircuits (PEMs).
Missions to MARS/planets/asteroids require electronic parts to operate and survive at extreme cold conditions. At extreme cold temperatures many types of cold related failures can occur. Office 514 is currently evaluating plastic parts under various cold temperature conditions and applications. Evaluations, screens, and qualifications are conducted on flight parts.