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Showing 1 to 20 of 40 for “"Fatigue life prediction"”.
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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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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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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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Neural Network Fatigue Life Prediction in Notched Aluminum Specimens from Acoustic Emission Data
<p>This purpose of this research was to identify fatigue crack growth and predict failure for 7075-T6 aluminum notched bars under uniaxial tensile loading using acoustic emission (AE) data. The experiments performed in this study extend the results obtained by previous researchers who used maximum …
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Neural Network Fatigue Life Prediction in 7075-T6 Aluminum from Acoustic Emission Data
… acoustic emission (AE) -data associated with fatigue cracks in aluminum fatigue specimens and to use early cycle life AE data to predict failure in such members. An AE data acquisition system coupled with a Kohonen self organizing map and a back propagation neural network were used to perform …
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Contact stress analysis and fatigue life prediction for a cam-roller follower system
An analytical treatment of the fatigue performance of a cam-roller followler system as influenced by residual stresses induced by grinding, is developed. An approach based on an extended Hertzian analysis is used to determine the 3-D contact stress fields, which are then combined by elastic …
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Neural Network Fatigue Life Prediction in Steel I-Beams Using Mathematically Modeled Acoustic Emission Data
<p>The purpose of this research is to predict fatigue cracking in metal beams using mathematically modeled acoustic emission (AE) data. The AE data was collected from nine samples of steel I-beam that were subjected to three-point bending caused by cyclic loading. The data gathered during these …
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Fatigue Life Prediction of Edge-Welded Metal Bellows Using Neural Networks and Multiple Linear Regression
… metal bellows present an ongoing challenge: the prediction of an accurate cycle life. Current methods rely on physical leak detection to determine a bellow's cycle life to failure. It is known, however, that crack initiation begins many cycles before a leak path is present. Bellows manufacturers …
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Extension of the Local Strain Fatigue Analysis Concepts to Incorporate Time Dependent Deformation in Titanium(6)-Aluminum(4)-Vanadium at Room Temperature (Fatigue)
… incorporated into the existing framework of the fatigue life prediction methods based upon the local strain approach. This methodology has been developed over the last twenty years to analyze the time independent deformation and damage characteristics of notched members subjected to fatigue …
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Structural Analysis of a Pultruded Composite Beam: Shear Stiffness Determination and Strength and Fatigue Life Predictions
… quasi-static loading and to develop a strength prediction for the DWB. FEA was utilized to investigate two possible failure modes in the top flange: compression failure of the carbon fiber plies and delamination at the free edges or taper regions. The onset of delamination was predicted using a …
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Analysis of column interconnects for wafer level packages
… approach was chosen for solder joint fatigue life prediction of three different CuC interconnects in 20mm by 20mm wafer level packages with 100A?m pitch.
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Space-Time Multiscale-Multiphysics Homogenization Methods for Heterogeneous Materials
… developed spatial homogenization theory for fatigue life analysis of heterogeneous materials. The unified space-time multiscale homogenization model is validated for fatigue life prediction of elevated temperature Ceramic Matrix Composites (CMCs). In the final phase of the research a …
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A study of fretting fatigue incorporating sharp corner contact geometry.
Fretting fatigue occurs when components are in contact and subjected to cyclic loads or vibrations. The following research programme investigates the fretting fatigue phenomenon using a specific flat contact geometry encompassing sharp comers. The pressure distribution at the contact interface is …
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Strength and Life Prediction of FRP Composite Bridge Deck
… experimentally. Strength, failure mode and fatigue life prediction methodologies for a cellular FRP bridge deck are presented in this dissertation.
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Multiaxial fatigue damage model for random amplitude loading histories
In spite of many multiaxial fatigue life prediction methods proposed over decades of research, no universally accepted approach yet exists. A multiaxial fatigue damage model developed for approximately proportional random amplitude loading is proposed in this study. A normal strain based analysis …
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Fatigue response of fabric reinforced polymeric composites
… of fabrics, mats, rovings, etc. Currently, the fatigue response of multidirectional composite is not readily available in the literature and much work needs to be done to understand the behavior of these composites under fatigue loading.;In this study three fabric based glass FRP composites used …
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