... 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...

.... While this secondary crack was observed to propagate to the free surface, the crack eventually became nonpropagating. Thus, the secondary crack was not considered in the fatigue modeling efforts. Through-crack initiation life results of friction stir spot welds fatigue tested at R = 0...

... 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 curves were obtained. Crack development and deformation patterns were identified...

... 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...

... 2005 aluminium alloys sheet materials crack-edge stress field analysis fatigue cracks fatigue testing crack detection internal stresses numerical analysis Crack Arrest Crack Growth Dimple Fatigue Life Pinching Force Stop Hole Stress Intensity Factor A crack initiated...

... 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 stresses In recent years, there has been considerable...

... microstructure notch testing fatigue testing brittle fracture slip grain boundaries surface cracks optical microscopy The application of damage tolerance methods to high cycle fatigue (HCF) is hindered by the anomalous behavior of microstructurally “short” cracks that can control fatigue life...

... foams fatigue fatigue testing stress-strain relations failure (mechanical) deformation surface cracks compressive testing internal stresses scanning electron microscopy Metallic foams are newly emerged, multifunctional, lightweight materials. Increasing applications have been exploited...

...-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...

... force and conditions for cracking mode transition. Manuscript received January 1, 2003; revision received September 14, 2004. Review conducted by: W. Soboyejo. 01 January 2003 14 September 2004 22 02 2005 nickel fatigue cracks fracture mechanics fatigue testing bending...

...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...

... 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. 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...

... received April 20, 2004. Associate Editor: W. Soboyejo. 25 April 2003 20 April 2004 09 11 2004 nickel alloys titanium alloys shape memory effects stress-strain relations fatigue cracks elasticity bending fatigue testing surface roughness rough surfaces In a shape...

... by the Materials Division February 28, 2000. Associate Editor: D. Marquis. 28 February 2000 30 09 2002 fatigue testing log normal distribution Weibull distribution Fatigue Life Scatter Fatigue Life Estimation Sample Size Variance Fatigue life data exhibits wide scattered...