Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Fractography"”.
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The fractography of inorganic glass.
Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
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Correlation of fractography, microstructure and fracture toughness behavior of high strength alloys.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
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Influence of Grain Size and Widmanstätten Colonies on Variability of Tensile Properties of Forged Ti-6Al-4V
… tensile testing, quantitative metallography and fractography were conducted to identify aspects of the microstructure and fracture surfaces that may have caused the variability. Three aspects of the microstructure that were identified as characteristics that may affect the mechanical properties …
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The edge flaking of tungsten carbide hardmetal cermets under repetitive impact loading
… cone cracking dominates in the cermets. The fractography of the crack surfaces and crack paths, occurring in the cermets, have been studied in order to explain the edge flaking performance. Contiguity and mean-free path are found to have important influences on the edge flaking performance. …
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Cracking of zirconium alloys at constant load with and without applied potentials
… technique. Metallurgical microstructures and fractography were analyzed by optical microscopy and scanning electron microscopy (SEM), respectively. The results obtained from this study indicate that no failures were observed under constant loading with smooth specimens. However, the notched …
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Characterization and Simulated Analysis of Carbon Fiber with Nanomaterials and Additive Manufacturing
… within the nylon filament, as well as the fractography of tested samples. Experimental testing shows that compressive strength increased by 28%, and the average SBS samples increased by 8% with minimal impacts on the tensile strength. The simulated results for Nylon/CF tensile samples were …
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Deformation and fracture behavior during annealing of residually stressed polycrystalline aluminum oxide
… strength measurements, and scanning electron fractography clearly indicate stress relaxation at annealing temperatures occurred by elastic creep through crack nucleation and growth in regions under tensile stresses. From the scanning electron fractographs, it was found that intergranular …
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Comparison of Additively Manufactured and Wrought 17-4 PH Stainless Steels in Ultra Low Cycle Fatigue
… wrought specimens, post fracture microstructure, fractography, surface hardness, and material characterizations are conducted. Results indicate reduced fatigue life for AM 17-4PH stainless steel as compared to the wrought counterparts. Fatigue life reductions of 62% and 65% were measured for the …
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Stress and fatigue analysis of SVI-tested camshaft lobes
… due to the sliding friction of the follower. Fractography studies show a difference between fracture surfaces among the cracks examined; straight cracks exhibit features resembling fatigue propagation, while fracture surfaces from pitted cracks show a more brittle behavior. Small grinding …
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Thermoplastic prepreg manufacture by solution impregnation
… beam mechanical tests were performed. Fractography photomicrographs were taken. X-Ray photoelectron spectroscopy was used to investigate the possibility of residual solvent in the laminates. High quality prepreg was manufactured and the critical parameters in the prepregging process …
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Manufacturing and properties of titanium-based materials produced by selective laser melting
… of CP-Ti while maintaining its ductility. Fractography study of the tensilefailed specimens showed that incompletely melted particles and porosities caused early fracture in porous samples. Mixture of dimples and minor quasi-cleavage facets covered most fracture surface in fully dense …
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Impact fracture of embrittled stainless steels
… by impact testing, metallography, and SEM fractography. New data for uncharged and hydrogen-charged specimens of Types 304L and 316L austenitic stainless steels show significant hydrogen effects on the impact behavior of both materials. The Type 316L specimens showed greater hydrogen …
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Elevated temperature mechanical properties of zirconium diboride based ceramics
… temperatures tested for each composition. Fractography was used extensively to characterize the strength limiting flaws as a function of temperature. Strength of ZS in argon was controlled by the SiC cluster size up to 1800ºC, and the formation of B-O-C-N phases that bridged SiC clusters …
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Analysis of residual stresses in laser trimmed alumina microelectronic substrates
… these characterization steps gave results for fractography (optical), surface and bulk composition (SEM/EDAX), chemical composition (ESCA) and phase analysis (EPMA). Results show that laser trimming produces stress gradients which are generally tensile in nature and could have deleterious …
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Effect of Processing Path on Microstructure and Mechanical Properties of a Low Carbon, Low Alloy Advanced High Strength Steel
… was similar to that in water-quenched condition. Fractography revealed the scale and nature of fractographic features associated with the fractured surface to be dependent on the processing conditions. In this work, a strong influence of processing on microstructural evolution and mechanical …
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Systematic assessment of the influence of voids on the material performance and failure in additively manufactured polymers.
… propagation, X-ray computed tomography (CT), fractography, thermography and digital image correlation (DIC) were adopted to investigate the influence of process-induced and in-service voids in FFF components. Compact tension specimens (CTS) were used to evaluate plane-strain fracture toughness …
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Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading
… characterisation results, combined with the fractography results, indicated brittle failure modes typical of high strain rate failures in strain rate sensitive materials, such as the chosen AISI 430 stainless steel plates. In the second investigation, into localised loading, the material …
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Lead-free solders for high-reliability applications: high-cycle fatigue studies
… are employed. In addition to extensive fractography, the damping capacity of the solders is investigated and a scanning acoustic microscope is used in conjunction with resonant decay tracking of specimens to study the crack propagation paths prior to complete failure. The analysis of …
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Additive Manufacturing of Aluminium-Metal Matrix Composite developed through Mechanical Alloying
… parameters were obtained. Furthermore, the fractography, mechanical and microstructural evolution of the Al/SiC composite, with different percentage volume reinforcement manufactured by the LM and subsequently heat treated, was explored for the first time.
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Mechanical and Physical Properties in Additive Friction Stir Deposited Aluminum
… to generate mechanical property data while fractography, and metallography were used to better understand the metallurgical implications of this process. This research determined that the refinement of the grain size caused by the AFSD process had little or no strengthening effect on the …
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