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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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Spherical bubble growth or collapse in component inviscid liquid with constant material properties through irreversible thermodynamics and kinetic theory
Stress analysis method of photoelasticity extended to viscoelastic materials by manufacturing mathematical model from transparent birefringent material properties
Material properties, shielding, and coatings examined in development of flat flexible conductor cables
Cavitation damage in alkali metal pumps, noting damage resistance and material properties for application in space power systems
Fine lunar surface material properties at Surveyor 3 landing site
Plane strain fracture toughness determined for crack notched bend specimens using standard test procedure for specific metallic material property
Adhesives, coatings, coated fabrics, elastomers, encapsulants, films, hardware and structural materials, and tapes are tested in a series of physical, mechanical, and electrical tests. Material properties are measured before and after exposure to the three environments.
Magnetic permeability and shape of special core inserts are varied to produce desired changes in saturation characteristics of current dependent inductor, thus improving its inductance-to-current properties. Materials and saturation levels of the core pieces are selected to permit a wide variety of relationships between inductance and current.
Preliminary design of engineering probes for studying lunar surface material properties
Summary of research studies on lunar surface material properties
Finite element method analysis of axisymmetrically loaded thin shells of revolution, considering nonlinearity due to material properties and shell geometry changes
Model relating spectral reflectance to thermal control materials properties and environment induced changes
Metal surface through and part through cracks, investigating dimensions and material properties effects on fracture stresses
High speed, automated system accurately measures to approximately one percent in three minutes. System identifies materials having constant thermal or electric conductivity, predicts new material properties, develops alloys in accordance with desired specifications, and develops nondestructive devices for measuring precipitation hardening.
Fracture mechanics theory used to determine effects of crack dimensions and material properties on fracture stresses for thin metal sections with through and part-through cracks
Welding thermal and residual stress analysis and material property and weld parameter effects on thermal stresses and elastoplastic deformation of aluminum alloys, steel, niobium, and tantalum
Viking rocket heat shield material mechanical properties, examining time-temperature superposition with continuous stress relaxation data measured in vacuum
The effects of material damping on flutter of stressed rectangular panels are studied within the context of linear thermoelasticity theory. The closed-form expression for the thermoelastic (material) damping coefficient is obtained as a function of frequency, panel temperature and dimensions, and material properties. The solution of the stability boundary value problem is obtained by use of a generalized Galerkin method in the cross stream direction which reduces the governing partial differential equations to a system of ordinary differential equations in the streamwise direction. These equations are then solved exactly. Numerical results are given for the thermoelastic damping coefficients and for the flutter speeds of partially and fully clamped panels subjected to midplane stress.