.... The results indicate that the stress relaxation mechanism for NBR aged at 80°C differs from that for samples aged at 90°C. The dominating aging mechanism for NBR samples stored at room temperature and accelerated at 80°C is free radical oxidation. The main mechanism under 90°C was found to be chain scission...

...SC Bose; K Singh; G Jayaraman The technique proposed here adopts short-term stress relaxation testing (SRT) to determine the metallurgical life of 1CrMoV large rotor steel. SRT has been performed at two temperature levels of 550°C and 600°C, on samples taken from the core region of a large rotor...

...K Porzucek; JM Lefebvre Tensile stress relaxation is shown to be an experimental way to quantify the short-term elastic recovery of linear low-density polyethylenes (LLDPEs). The evolution of the force decrement Δ F with the logarithm of time is described by two linear equations on both sides...

... gasket material for turbine applications. The results identified flexible graphite as the only material to meet or exceed the properties of asbestos gaskets. One limitation of flexible graphite uncovered in the program, however, is its relatively high stress relaxation behavior especially at temperatures...

...UP Sinha; DW Levinson Stress relaxation data were obtained in tension tests using the vibrating string technique (measuring the resonance frequency) in spring steel wire of ASTM Grade A 228 (also known as music wire). The steel wire of 0.56 mm diameter had a 0.29% offset tensile yield strength...

...) stable members microcreep testing stress relaxation bend testing gyroscopes References Discontinuous Silicon Carbide Reinforced Aluminum Metal Matrix Composite Databook , DOD Metal Matrix Composites Information Analysis Center , Santa Barbara, Calif. , 04 1984 . Gubbay , J. D...

...JS Mshana; AS Krausz The application of the transition state theory of rate processes to describe tension-tension cyclic deformation behavior was reviewed, leading to a coherent, unified theory for stress relaxation, creep, and strain and load controlled cyclic deformation. The study showed...

... cyclic stress-strain behavior low cycle fatigue elevated temperature testing stress relaxation References Laflen , J. H. and Cook , T. S. , “ Equivalent Damage-A Critical Assessment .” NASA CR-167874 , National Aeronautics and Space Administration , 1982 . Doner , M...

... of stress relaxation and permanent set. Some data on oxidative aging of natural rubber are recalled as a paradigm of chemically degrading elastomers and some simple scaling laws are described which (when they can be established) are useful for predicting longtime behavior from short-time tests. aging...

...GF Weissmann The conventional determination of the stress relaxation properties of metals and their alloys is tedious and time-consuming. The method of predicting stress relaxation in metal strips subjected to uniform bending is based on the work per cycle required to maintain a constant strain...

...A Fox The stress-relaxation behavior of two copper beryllium alloys in strip form, Copper Alloy UNS No. C17000 and C17200, was studied in the temperature range 23 to 232°C (73 to 450°F). The behavior of mill-hardened material is compared to that of material having been fully precipitation heat...

...A Fox The stress-relaxation behavior of three copper-nickel-tin alloys strengthened by spinodal decomposition was studied in the temperature range 23 to 204°C (73 to 400°F). The alloys studied were Cu-4%Ni-4%Sn, Cu-9%Ni-6%Sn, and Cu-15%Ni-8%Sn. The resistance to stress relaxation of these alloys...

... of previous strain, provided that plastic flow preceded the relaxation period. We observed that the short-time relaxation behavior did not manifest strong heat-to-heat variation. stress relaxation stress strain diagrams austenitic stainless steels high temperature tests References “ Class 1...

... obtained by using a simple, short-time stress-relaxation test, and their applicability to the design of flat springs or connectors is discussed. The short-time stress-relaxation test is proposed as a simple acceptance test for flat spring materials. The alloys studied include one copper-nickel-tin alloy...

...HR Jhansale Simple calculations for estimating extremes in fatigue life of metals, with or without accounting for cycle-dependent hardening, softening, and mean stress relaxation, are presented. These calculations aid in assessing the importance of cyclic deformation properties in cumulative damage...

...A Fox The ability of pressure-type electrical connections to remain stable and reliable over long periods of time depends in large measure on the stress-relaxation characteristics of the conductor and the connector material. For applications such as the miniaturized solderless wrapped connection...