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Showing 1 to 20 of 283 for “"Fatigue-life"”.
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Isothermal Fatigue Life Prediction Techniques
… made in advancing a pre-existing energy-based fatigue life prediction method into a powerful tool for real-world application through three distinct analyses, resulting in considerable improvements to the fidelity and capability of the existing model. First, a torsional fatigue life prediction …
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Contact fatigue : life prediction and palliatives
Fretting fatigue is defined as damage resulting from small magnitude (0.5-50 microns) displacement between contacting bodies where at least one of the bodies has an applied bulk stress. The applicability and limits of a fracture mechanics based life prediction is explored. Comparisons are made …
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Fatigue life prediction on nickel base superalloys
… with the UTS and YS models, a Low Cycle Fatigue (LCF) life model has been developed with promising initial results.<br/>Crack initiation at high temperatures has been studied in CMSX4 in both air and vacuum environments, to elucidate the effect of oxidation on the notch fatigue initiation …
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Computer aided fatigue life prediction for polymers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Fatigue Life of Hybrid FRP Composite Beams
… occurs between hybrid plys and dominates the life time response of a thick section FRP structure. The focus of this work is on the performance of the 20.3 cm (8 in) pultruded, hybrid double web I-beam structural shape. Experimental four-point bend fatigue results indicate that overall …
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A variable amplitude multiaxial fatigue life prediction method
A method to estimate the fatigue life of a component subjected to variable amplitude multiaxial loading has been developed. It is based upon an extension of the strain-life approach which achieved success in correlating the fatigue lives of components subjected to uniaxial variable amplitude …
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Thermomechanical and Vibrational Fatigue Life Assessment of Railway Wheels
… procedures. Most research studies in wheel fatigue life estimation did not account for structural, thermal and prestressed random vibrational loading as a coupled field. The present study develops an advanced numerical analysis methodology that incorporates real service conditions to …
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Validation of a Computational Model for Predicting Fatigue Life
A new computer model to predict fatigue life based on the evolution of damage in a structure is presented. The experimental data used to validate the model is provided by the SAE FDE Committee. The implemented damage model assumes that damage evolution can be computed as a function of the …
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Improving the Fatigue Life of Weldments With Longitudinal Attachments
Fatigue life predictions made using the FEM results of this study were in good agreement with the experimental results. Cold-lap defects were predicted to eliminate the fatigue crack initiation life but to affect the fatigue crack propagation life very little.
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A microstructure based fatigue life prediction framework and its validation
Fatigue crack initiation in polycrystalline materials can be attributed to various mechanistic and microstructural features acting in concert like the elastic stress anisotropy, plastic strain accumulation, resolved shear stress, normal stress, slip-system length, and grain boundary character. In …
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A Fatigue Life Prediction Method for Tensile-Shear Spot Welds
… model has been developed which predicts the fatigue resistance of tensile-shear spot welds under constant amplitude loading test. The TSIP model consists of Stage I--fatigue crack initiation and early growth, Stage II--through sheet thickness crack propagation, and Stage III--across sheet …
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Predicted Effects of Residual Stresses on Butt Weld Fatigue Life
Made available in DSpace on 2014-12-14T16:00:37Z (GMT). No. of bitstreams: 1 7811214.pdf: 3487716 bytes, checksum: 0c546889a9041bc640a3abb62ae421ed (MD5) Previous issue date: 1978
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Influence of Underfill on Ball Grid Array (BGA) Package Fatigue Life
… of underfill material properties on the fatigue life of Ball Grid Array (BGA) packages that are subjected to thermal cycling is investigated in this study. A finite element model is created using Ansys by assuming the existence of an infinite array of solder interconnects, cylindrical in …
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The Effect of Impact Damage on the Fatigue Life of Steel
… investigate the effect of impact damage on the fatigue life of steel using both experimental and finite element methods. Any component that is subjected to a single impact may have not only noticeable surface damage, but also residual stresses in its surface and subsurface layers. These residual …
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Alendronate treatment elicits a reduction in fatigue-life of canine cortical bone
… are unknown. This study characterized the fatigue-life of cortical bone tissue after bisphosphonate treatment with alendronate (Aln). 1 1th ribs from 36 skeletally mature female beagles (1-2 years of age) treated daily with either a vehicle control (Cont, 1mL/kg saline) or Aln (0.2 or 1.0 …
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Thermomechanical fatigue life investigation of an ultra-large mining dump truck tire
… in excess of 35 in. These tires experience fatigue failures in operation. The use of reinforcing fillers and processing aids in tire compounds results in the formation of microstructural inhomogeneity in the compounds and may serve as sources of crack initiation in the tire. Abrasive …
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Fatigue Life Estimates for a Notched Member in a Corrosive Environment (Corrosion)
… of an aggressive environment can be included in fatigue life estimation procedures by determining the material properties in the environment of interest. An analytical and experimental program was conducted to investigate this assumption. Automotive grade aluminum alloy 5454-H32 was selected for …
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Fatigue Life and Inelastic Strain Response Under Complex Histories for Analloy Steel
Made available in DSpace on 2014-12-12T00:25:48Z (GMT). No. of bitstreams: 1 7309919.pdf: 2271984 bytes, checksum: fcab75ff18398fe0abc01b06c6fb456a (MD5) Previous issue date: 1972
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The effect of hydrogen on the fatigue life of high strength steel
Torsional fatigue tests were conducted on 4370 steel oil quenched and tempered at 1000° F in (l) the uncharged state, (2) the hydrogen charged state, and (3) in a hydrogen environment. The tests were conducted on both smooth (K<sub>t</sub> = l.l) and V-notch (K<sub>t</sub> = 3.8) test specimens. A …
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