... exhibited tempered martensite, and nonmartensitic products, such as retained austenite and ferrite at the case and core, respectively. Fatigue testing results indicate that roll forged beams have demonstrated 37% higher fatigue lives (Weibull B50 life) compared to hot-die forged beams, despite similar quasi...

... ultimate strength and the modulus of elasticity of the tested laminate with or without embedded PFCS are within 7% of each other. The stress–life (S-N) curves obtained from fatigue tests indicates that the fatigue lives and strengths with and without the PFCS are close to each other as well. From short...

... to the composite to reveal their differences under fatigue loading. The laminated composite material, which has a unidirectional continuous AISI 304 stainless steel as fibers and Al 1060 as matrix, was produced by using diffusion bonding. Fatigue tests were conducted in accordance with ASTM E 647...

... fatigue testing fractography friction friction welding kink bands magnesium alloys With the increased interest in achieving improved fuel economy in automobiles, the need for lightweight alloys is essential. While only marginally employed in current automobile designs, recent advances have...

... In this study, the fatigue failure behavior of modified tensile-shear specimens was investigated both experimentally and numerically. Fatigue tests were conducted applying various load ranges on specimens. Two different types of spot-weld joints, automated and manual, were tested, and load range-fatigue life...

... to be restricted to the fatigue crack initiation stage. Thus, these effects can be evaluated exactly by the investigation on the fatigue crack initiation life. In this research a practical method is presented for detecting fatigue crack initiation during fatigue tests using an ion-sputtered film. Ion-sputtered...

... confirmed through fractographs. Hence it can be said that this technique eliminates the need for fractographs when determining the mode of damage during creep-fatigue interaction. In a strain-controlled low-cycle fatigue test it is customary to use a contacting extensometer. However, the extensometer can...

... peening parameters and the resulting material modifications. Results showed the possibility of using the proposed mathematical model to predict an initial range for effective waterjet peening under the variation of waterjet peening conditions. The high cycle fatigue tests were performed to validate...

... help to choose the candidate dimpling conditions before carrying out the laborious fatigue test, although it is based on the case of a two-dimensional crack in an infinite sheet. From these results, the superior crack arrest effects found in the larger pinching size, the small offset placement...

..., 2004. Review conducted by: H. Sehitoglu. 01 January 2003 14 September 2004 22 02 2005 nickel metallic thin films bending micromechanics micromechanical devices plasticity plastic deformation stress-strain relations fatigue testing fatigue fracture mechanics internal...

... received September 14, 2004. Review conducted by: W. Soboyejo. 01 January 2003 14 September 2004 22 02 2005 nickel chromium alloys nickel alloys superalloys anisotropic media fatigue cracks crystal microstructure notch testing fatigue testing brittle fracture slip grain...

... fatigue test lasted for hours, it was impossible to obtain images continuously from the beginning to the end of a test. Therefore, images were obtained selectively before and after the moment of the unstable deformation. DIC analysis was then carried out on these in-situ images to obtain the temporal...

...-transfer theories are applied to quantify the relationship between the observed temperature variations and stress–strain states during fatigue. The thermoelastic effect has been utilized to calculate the maximum stress level during fatigue testing. The predicted results matched the experimental data quite...

...Tommy J. George; M.-H. Herman Shen; Onome Scott-Emuakpor; Theodore Nicholas; Charles J. Cross; Jeffrey Calcaterra A new vibration-based fatigue testing methodology for assessing high-cycle turbine engine material fatigue strength at various stress ratios is presented. The idea is to accumulate...

... materials. nickel fatigue cracks fracture mechanics fatigue testing bending crystal orientation internal stresses fractals finite element analysis 01 January 2003 14 September 2004 22 02 2005 Manuscript received January 1, 2003; revision received September 14, 2004...

... different types of Nicalon™/CAS composites: crossply and unidirectional specimens. During fatigue testing, an IR camera was used for in-situ monitoring of temperature evolution of Nicalon™/CAS samples. Stress versus cycles to failure curves were generated for predicting the lifetime of Nicalon™/CAS...

...M. Nasr; M. N. Abouelwafa; A. Gomaa; A. Hamdy; E. Morsi Thin-walled tubular specimens, made from woven-roving glass fiber-reinforced polyester (GFRP) with two fiber orientations, [ ± 45 ° ] 2 s and [ 0 , 90 ° ] 2 s , were tested under torsional fatigue tests at negative stress ratios R , R = − 1...

...M. M. Shenoy; A. P. Gordon; D. L. McDowell; R. W. Neu A continuum crystal plasticity model is used to simulate the material behavior of a directionally solidified Ni-base superalloy, DS GTD-111, in the longitudinal and transverse orientations. Isothermal uniaxial fatigue tests with hold times...

... cracking initiates on the rougher inner surface, resulting in a shorter fatigue life than in the case of the wire. Relationships between strain amplitude ε a and the number of cycles to failure N f for FHP-NT, obtained from fatigue tests at various temperatures in water...

... on the analysis of the variance of error which arises due to scattered nature of the fatigue life data. An example of the application of the presented method is also given. fatigue testing log normal distribution Weibull distribution Fatigue Life Scatter Fatigue Life Estimation Sample Size Variance...