Investigation of strength of isolated vertebrae, phase IV Final technical report, 29 Oct. 1965 - 28 Oct. 1966
Dynamic strength measurements of human vertebrae under axial compression
FRACTURE MECHANICS↗
SEARCH · Engineering Papers
Results for “yield strength”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Fracture mechanics - The search for safety in numbers.
Safety design for high strength low toughness materials assumed to have hidden flaws, formulating stress intensity factor for fracture mechanics
YIELD STRENGTH↗
Texture strengthening and fracture toughness of 4Al-0.2O and 5Al-2.5Sn ELI titanium sheet biaxial stress fields at room and cryogenic temperatures
Texture strength and fracture toughness of titanium alloy sheet biaxial stress fields at room and cryogenic temperatures
FRACTURE TOUGHNESS↗
Analyses of composite structures
Stiffness and strength analyses on composite cross-ply and helical wound cylinders and flat laminate structures
YIELD STRENGTH↗
Tensile Properties of 17-7 PH and 12 MoV Stainless-Steel Sheet under Rapid-Heating and Constant-Temperature Conditions
Results are presented of rapid-heating tests of 17-7 PH and 12 MoV stainless-steel sheet heated to failure at temperature rates from about 1 F to 170 F per second under constant-load conditions. Yield and rupture strengths obtained from rapid-heating tests are compared with yield and tensile strengths obtained from short-time elevated-temperature tensile tests (30-minute exposure). A rate-temperature parameter was used to construct master curves from which yield and rupture stresses or temperatures can be predicted. A method for measuring strain by optical means is described.
Manning, Charles R., Jr.↗
The influence of heating in different gases on the toughness /impact strength/ of commercial titanium
Impact strength of titanium unaffected by heating time during vacuum heating
HEATING↗
Short-term and long-term /creep/ strength of six-component titanium alloys AT-3, AT-4, AT-6, and AT-8 /according to data obtained with industrial melts/
Strength characteristics of industrial melts of multicomponent titanium alloys with .03 to .075 aluminum content
ALUMINUM↗
Mechanical Design of the Urban Air Mobility Side-by-Side Test Stand
The Urban Air Mobility Side-by-Side Test Stand (SBS) is a new capability for the National Aeronautics and Space Administration (NASA) to test the conceptual side-by-side rotorcraft configuration. This test stand enhances the experimental capabilities of the Revolutionary Vertical Lift Technology (RVLT) Project and is primarily designed to be tested in the U.S. Army’s 7-by 10-Foot Wind Tunnel at NASA Ames Research Center. One of the goals for the SBS is to identify the optimal degree of rotor overlap that will yield the best aerodynamic performance. The SBS has two counter-rotating, intermeshing rotors that can vary in lateral separation. The test stand can pitch nose up and nose down, with each rotor having the capability to be trimmed independently through cyclic and collective controls. Six-axis load cells and rotary torque sensors are placed underneath each rotor to measure the thrust, torque, and side force from each rotor system. This paper describes the mechanical design of the SBS and outlines the structural analyses conducted to ensure a safety factor of 4 for ultimate strength and 3 for yield strength during all experimental testing.
Mechanical Design↗
Mechanisms of strengthening and fracture in composite materials second progress report, dec. 1, 1964 - may 31, 1965
Mechanisms of strengthening and fracture in composite materials
FRACTURE MECHANICS↗
Mechanical properties of two-phase crystalline materials.
Yielding behavior and dislocation motion in two phase crystalline solid
TWO-PHASE SYSTEM↗
Analysis of ultraviolet radiation effects on yield stress of polymethyl methacrylate.
Yield stress of polymethyl methacrylate subjected to vacuum UV radiation is function of strain rate, tensile test temperature and irradiation dose
ULTRAVIOLET RADIATION↗
Effect of elevated temperatures on sputtering yields.
Elevated temperatures effect on sputtering yields of polycrystalline and single crystal metals, considering defect annealing and focused collision sequence
TEMPERATURE EFFECT↗
Development of light weight magnesium alloys for low temperature applications Annual progress report, Jun. 19, 1965 - Mar. 20, 1966
Lightweight magnesium alloys for cryogenic applications
YIELD STRENGTH↗
Yield stress master curves for various polymers below their glass transition temperatures.
Yield stress master curve for polymers below glass transition temperature
POLYMETHYL METHACRYLATE↗
Time-temperature-strain rate equivalence for various engineering thermoplastics.
Linearity of mechanical behavior and applicability of yield stress master curve analyzed for various crystalline-type polymers
TEMPERATURE EFFECT↗
Adhesion and cohesion of metals in the space environment.
Temperature, time and loading conditions for adhesion or cohesion of structural metals in vacuum
METAL-METAL BONDING↗
Basic mechanisms of stress-corrosion cracking of titanium.
Stress corrosion mechanism of titanium noting experimental conditions, results of chemical analyses, time factor, material resistance to crack formation, etc
CRACK FORMATION↗
Solvent permits solid curing agents to be used at room temperatures
Solvent system dissolves the solid curing agents used with polyurethane resins in adhesive systems. The system developed yields bond strengths comparable to 100 percent solid formulations. The optimum solvent chosen was a 55.5 percent solution in anhydrous tetrahydrofuran.
St. Cyr, M. C.↗