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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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Flowmeter determines mix ratio for continuous flow mixing machine used to produce an adhesive from a high viscosity resin and aliphatic amine hardener pumped through separate lines to a rotary blender. The flowmeter uses strain gages in the two flow paths and monitors their outputs with appropriate instrumentation.
Analysis of notches and cracks - correlation between elastic work hardening plastic continuum theory and experiment
Incremental loading tests on annealed aluminum under tensile creep, discussing linear viscoelastic response, strain hardening and cyclic stresses
Chemical, mechanical, physical and microstructural properties of cobalt base dispersion hardened alloys
Pressure and temperature dependence of slow crack growth in hardened steel in gaseous hydrogen environment
Plastic deformation of internally oxidized dispersion strengthened silver magnesium alloys, noting hardening effect dependence on oxidation temperature
Plane strain and stress compared for elastoplastic cracked plate in work hardening tension
Composition and thermal treatment effects on weldability of precipitation hardened Ni base alloy, analyzing heat affected zone cracking sensitivity
Age hardening in Inconel 718 is investigated using Brinell hardness measurements. Formation of a precipitate causes an increase in hardness.
Two new precipitation-hardened magnetic alloys are suitable for operation in 800 to 1600 deg F range. One is a martensitic alloy and the other a cobalt-based alloy. They possess improved creep resistance and have application in high temperature inductors and alternators.
Cryogenically worked materials during strain hardening
Hardened steel embrittlement in low pressure hydrogen caused by crack growth as function of temperature
Computer program, CRAB, uses finite-element method to calculate creep behavior and predict steady-state stresses in an arbitrary body of revolution subjected to a time-dependent axisymmetric load. Creep strains follow a time hardening law and a Prandtl-Reuss stress-strain relationship.
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.
Implanting nitrogen ions improves hardening of silicon oxides 30 percent to 60 percent against ionizing radiation effects. Process reduces sensitivity, but retains stability normally shown by interfaces between silicon and thermally grown oxides.
Mechanical properties determined for precipitation hardened tantalum base alloy /ASTAR-811C/ for potential use in Rankine cycle nuclear power systems
Surface evaluation of stainless steel gyro bearings manufactured by various hardening techniques
Stress analysis of thin shells with large deflections loaded into strain hardening range