... Strain-controlled creep-fatigue crack growth tests were conducted using a circular sharp notched round bar specimen (CNS) for a nickel (Ni) base alloy, Alloy 617, which is a candidate material for the next-generation advanced ultra-supercritical (A-USC) power plant. The reduction ratio of stress...

... understanding of the creep-fatigue behavior. Strain-controlled low cycle fatigue (LCF) tests including hold times up to 1800 s at maximum tensile strain were conducted at 950°C and a total strain range of 0.3% in air and in a simulated VHTR impure helium. For similar test conditions, the creep-fatigue behavior...

... data of smooth specimens. A suitable model for the assessment of the reduction of fatigue life in creep-fatigue conditions is proposed. creep-fatigue single crystals superalloys notch behavior high temperature testing elasto-visco-plastic model Mauro Filippini1 Reprinted from JAI, Vol. 8...

... The thermal mechanical cycling of high temperature components can result in creep-fatigue cycles in which the creep dwell has a wide variety of positions within the cycle. During in-phase cycling the creep dwell is placed at the maximum strain in the cycle. Out of phase cycling gives compressive...

... hold-time creep-fatigue loading. The Stress Relaxation Model predicted the stress relaxation curve during the hold time of cyclic loading, based on the creep properties of the material. The Interactive Damage Rate Equation predicted the hold-time creep-fatigue life using a methodology, in which the key...

... The American Society for Testing and Materials (ASTM), through its Committee E08 on Fatigue and Fracture subcommittee E08.05 on Creep-Fatigue Crack Formation, has recently developed a new standard for creep-fatigue testing (ASTM E2714-09). This paper describes the plans and preliminary results...

... A testing method under creep-fatigue interaction conditions has been proposed as the ASTM standard E2714-09. In accordance with the ASTM standard, round bar smooth specimens have been recommended as a testing specimen. Additionally, creep-fatigue crack initiation and growth life are usually...

... the crack propagation behavior in such a structure. The authors investigate the effect of microstructural inhomogeneity on crack propagation morphology and crack propagation rate ( da∕dN ) under a creep-fatigue condition. The macroscopic direction of the main crack is perpendicular to the loading axis...

... An in-beam creep-fatigue testing machine for a miniaturized specimen was developed at National Research Institute for Metals to investigate the synergistic effects of stressing and irradiation damage on the mechanical properties of materials. The loading and displacement measuring system...

... observation of the cross section of specimens interrupted at different fatigue cycles, the simulation is carried out continuously and reproduces inner cracking behavior throughout the fatigue life. This enables us not only to extract the spatial distribution of inner cracks at arbitrary creep-fatigue cycles...

... and German laboratories. Properties evaluated include tensile, impact, creep, fatigue, and creep-fatigue. The preliminary results, which cover the dose range from 0 to 5 displacements per atom (and/or up to 9 appm helium) are presented as comparisons between irradiated and unirradiated control data, covering...

... A microstructural model has been developed to predict creep-fatigue life in a [0°] 4 , 9 volume percent tungsten fiber-reinforced copper matrix composite at the temperature of 833 K. The mechanism of failure of the composite is assumed to be governed by the growth of quasi-equilibrium cavities...

... A recently developed cumulative creep-fatigue damage model is applied to the prediction of thermomechanical and isothermal cumulative creep-fatigue loading histories. The model utilizes damage curve expressions to describe cumulative damage evolution under creep-fatigue conditions, qualitatively...

... of plasticity and creep with the mean applied stress and the effect of this interaction on the fatigue life are investigated. A sample calculation is applied to René 80 at 1255 K (1800°F). fatigue (metals) creep-fatigue mean stress life prediction damage mechanics high temperature René 80 Nader...

... A model of cumulative creep-fatigue damage has been developed which is based on the use of damage curve equations to describe the evolution of creep-fatigue damage for four basic creep-fatigue cycle types. These cycle types correspond to the four fundamental cycles of the StrainRange...

... in the model and to provide the TMF verification data to check its accuracy. Predicted lives are in agreement with the experimental lives to within a factor of approximately 2. fatigue (metal) thermal fatigue thermomechanical fatigue bithermal fatigue creep-fatigue low-cycle fatigue high...

.... Comparisons are made with isothermal fatigue results obtained previously. fatigue (metal) thermomechanical fatigue bithermal fatigue creep-fatigue low-cycle fatigue high-temperature fatigue flow behavior failure behavior inelastic strain strainrange partitioning superalloys G. R. Halford, 1...

... Discussed are the failure modes observed in a Type 316 stainless steel under biaxial high temperature low cycle fatigue (HTLCF) and creep-fatigue strain cycling. All tests were carried out in air at 621°C (1150°F) using thin-walled tubular type specimens specially designed for axial, torsional...

... properties tensile properties impact toughness fracture toughness fatigue creep-fatigue fatigue with hold time low cycle fatigue STP1046-EB/May 1990 Ali Asghar Tavassoli1 Effect of Neutron Radiation on Mechanical Properties of Permanent Near Core Structures REFERENCE: Tavassoli, A. A., "Effect...

... regime without having to conduct expensive failure tests in this regime or resort to questionable larger extrapolations. fatigue (metal) creep-fatigue life prediction strainrange partitioning constitutive modeling nickel-base superalloys creep plasticity strain fatigue James F. Saltsman...