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Showing 1 to 20 of 28 for “"Fatigue Crack Propagation"”.
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Fatigue crack propagation in functionally graded materials
Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step …
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Fatigue crack propagation along polymer-metal interfaces in microelectronic packages
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Sensitivity Analysis of Interface Fatigue Crack Propagation in Elastic Composite Laminates
… Delamination growth under applied fatigue loads usually leads to structural integrity loss of the composite laminate, and hence its catastrophic failure. It is known that several parameters can affect the fatigue fracture performance of laminates. These include the constituent …
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A critical analysis of fatigue-crack propagation data for 2024-T3 aluminum.
Fatigue-crack growth data for 2024-T3 aluminum was used to evaluate the accuracy of Forman's equation. Forman's equation was found to predict from one-third to twice the observed cycles to a given crack length when applied to multiple cyclic stress ratios. An alternative approach was developed, …
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The influence of inclusion content on fatigue crack propagation in aluminum alloys.
Thesis: M.S., Massachusetts Institute of Technology, Department of Metallurgy and Materials Science, 1972
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A comparison of fatigue crack propagation in Inconel 625 and 3.25 Ni steel.
Massachusetts Institute of Technology. Dept. of Ocean Engineering. Thesis. 1972. Ocean E.
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Effect of strength, load ratio and environment on near-threshold fatigue crack propagation of 2 1/4 Cr - 1 Mo steel
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1980.
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Fracture Toughness and Fatigue Crack Propagation Testing and Evaluation of Additive Manufactured Titanium Alloy Metals at Different Orientations by Electron Beam Melting
… new powder. The second experiment tested the fatigue crack growth rate of specimens made from powder that had been reused. These two experiments also studied the effects build orientation has on material properties by conducting the first two tests with specimens at four different …
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Systematic assessment of the influence of voids on the material performance and failure in additively manufactured polymers.
… with particular focus on fracture toughness and fatigue crack propagation. Various experimental techniques including fracture initiation, fatigue propagation, X-ray computed tomography (CT), fractography, thermography and digital image correlation (DIC) were adopted to investigate the influence …
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The fatigue-crack growth and fracture characteristics of a precipitation-hardened semiaustenitic stainless steel
Fatigue-crack propagation and residual static-strength data on PH15-7Mo (TH 1050) stainless steel are presented in this thesis. In addition, the capability of McEvily and Illg's crack-growth analysis and Kuhn and Figge's residual strength analysis to correlate the test data has been investigated. …
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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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Corrosion fatigue of engineering alloys in aqueous environments
A comparative study of the fatigue crack growth rate (FCGR) behaviour of five alloys in air and in aqueous environments has been performed. The alloys tested include: mild steel as a reference material, a corrosion resistant dual phase steel, 3CR12, a proprietary martensitic stainless steel, AISI …
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Further Development of the Total Fatigue Life Model for Weldments and Its Application to Fatigue Design
Cruciform joints were fatigue tested under SAE Bracket variable loading history. Tube-to-plate welds were fatigue tested under bending and torsion loading conditions. Fatigue test results were compared with predictions made using the total fatigue life model which predicts the total fatigue life of …
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Three-dimensional boundary element and experimental analysis of lubricant ceramic surface ring cracks in rolling contact.
Surface defects such as ring cracks are located on silicon nitride ceramic rolling elements.The random nature of ring crack position creates difficulties in predicting rolling contact fatigue (RCF) life. The influence of the lubricant, contact pressure and crack geometry on the RCF mechanism is …
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MECHANISTIC STUDY OF CRACK INITIATION AND PROPAGATION IN CROSSLINKED ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENES (UHMWPE) SUBJECTED TO STATIC AND CYCLIC LOADING
… help the longevity of the components in vivo. Fatigue crack propagation behavior of two crosslinked UHMWPE formulations was investigated to estimate the mechanical governing factor for stable crack propagation. Frequency, waveform and R-ratio were varied between test conditions to determine the …
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ΕΛΕΓΧΟΜΕΝΗ ΔΙΑΔΟΣΗ ΡΩΓΜΩΝ ΛΟΓΩ ΚΟΠΩΣΗΣ ΣΕ ΣΥΝΘΗΚΕΣ ΣΥΝΤΟΝΙΣΜΟΥ
FATIGUE CRACK PROPAGATION IN VARIOUS RESONATING MEMBERS IS STUDIED. THE CRACK PROPAGATION RATE IS RELATED TO THE STRESS INTENSITY FACTOR OR THE STRAIN ENERGY DENSITY FACTOR DEPENDING ON THE KIND OF THE APPLIED LOADING. FOR THIS PURPOSE, THE WELL KNOWN EQUATIONS OF PARIS AND SIH ARE USED. THE DEPTH …
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The microstructural evolution of fatigue cracks in FCC metals
The microstructural evolution during fatigue crack propagation was investigated in a variety of planar and wavy slip FCC metals. The planar materials included Haynes 230, Nitronic 40, and 316 stainless steel, and the wavy materials included pure nickel and pure copper. Three different sets of …
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Fatigue cracking of lumber bandsaw blades
The focus of this research is on the fatigue cracking problem in the tooth gullet region of wide handsaw blades used in the lumber industry. This thesis presents both the theory and the experiment aspects of this research in terms of the tasks defined as follows. The current literature was reviewed …
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Detection of Fatigue Crack Growth in a Simulated Aircraft Fuselage
… emission (AE) nondestructive testing can detect fatigue cracks as they occur in complex structures. One use for AE has been in-flight detection of fatigue cracks in aircraft. The KC-135 aircraft were successfully monitored as early as 1979. The main problem with this and subsequent applications …
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Grain size effects on the fatigue response of nanocrystalline materials
The resistance of metals and alloys to fatigue crack initiation and propagation is known to be influenced significantly by grain size. Based on a wealth of experimental results obtained from microcrystalline metals, where the grain size is typically greater than 1 um, it is widely recognized that …
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