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 92 for “"fracture surfaces"”.
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A variable capacitor made from single crystal silicon fracture surface pairs
… and nano-smooth single-crystal-silicon surfaces have been fabricated by deliberately fracturing a weakened portion of a larger structure whose flexural mechanism refines and concentrates an externally applied load to a notched specimen region pre-.fracture and acts as a precision bearing …
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The Fracture Behavior and Mechanical Performance of Biodegradable Cornstarch Plastic Composites
… total energy-to-break to the roughness of the fracture surfaces obtained by three-dimensional reconstruction revealed a relatively positive correlation, meaning that as the fracture surfaces appear rougher and more characteristically like ductile fractures, the stronger, more ductile and …
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Strength Development at Incompatible Polymer Interfaces
… parameter, X. Microscopic investigation of the fracture surfaces revealed dissimilar fracture surfaces for a given pair, with evidence of stick-slip crack growth. X-ray photoelectron spectroscopy revealed residues of one polymer on the other's surface, indicating cohesive fracture occurred to …
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Stress and fatigue analysis of SVI-tested camshaft lobes
… 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 cracks (approximately 300 μm in length) were found …
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Effect of oxygen potential on high temperature crack growth in alloy 617
… decreased from 2 Hz to 0.1 Hz. In contrast, the fracture surfaces resulting from static loading were found to be intergranular and exhibited two different environmental behaviors. At a stress intensity factor of 49.5 MPa'Im, decreasing the oxygen potential lead to an increase in crack growth …
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Diagnosing Bone Fracture to Assess Early Hominin Behaviour, Meat-Eating, and Socioecology at FLK-Zinjanthropus, Olduvai Gorge, Tanzania
… to diagnose hammerstone- and carnivore induced fracture. This is important because interpretations of hominin entry into the carnivore guild and evolution of meat-eating are based on rare tool and tooth marks in Oldowan (2.5-1.8mya) fossil assemblages. Consequently, estimating hominin and …
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Avaliação da influência da espessura de adesivos estruturais em juntas metálicas com diferentes preparações superficiais
… of the ISO/DIS 10365:2020(E) standard and the fracture surfaces examined by scanning electron microscopy. In addition, with the support of the PCA - Principal Component Analysis statistical tool, it was possible to reduce seven variables (formulation, sample preparation, adhesive type, …
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Investigation of changes in permeability due to poro-thermo-elastic effects in enhanced geothermal reservoirs
… data is utilized to generate the subsurface fracture map of three formations. For this purpose, a geological structure is reconstructed according to its past tectonic history. Then fractures are stochastically simulated using Gaussian simulation. After generating the subsurface fracture map, …
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The Mechanical Thermal and Microstructural Behaviors of the Strip Silicates Reinforced Epoxy-based Nanocomposites
… content in the epoxy samples increased, the fracture surfaces were rougher, irregular in shape and broken down into tiny pieces with stress whitened sharp edges. A lot of white spots or white lines which believed to be the nanoclay (strip silicates), were found coming out from the fracture …
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Cellulose fiber reinforced thermoplastic composites: Processing and Product Charateristics
… resulting composites. SEM studies of the tensile fracture surfaces indicated significant interfacial delamination and also pull - out of fibers when WEF, AEF, and COF were used to reinforce the CAB matrix. Composites with AAEF, by contrast, revealed fracture surfaces with reduced interfacial …
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Characterization and Performance of a Self -Healing Composite Material
… electron microscopy is used to analyze the fracture surfaces and provide physical evidence of repair.
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Effect of temperature on the fracture behavior of lead-free solder joints
… is to examine the effect of temperature on the fracture behavior of Cu-SAC305-Cu joints. To this end, double cantilever beam (DCB) specimens, consisting of a thin layer of Sn96.5Ag3.0Cu0.5 (SAC305) solder sandwiched between two copper bars, fabricated under standard surface mount (SMT) …
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The environmental effect on corrosion fatigue behavior of austenitic stainless steels
… as the loading rise time increases. The fracture surfaces of low sulfur content heat specimens showed transgranular features with facets ("river pattern") and few oxide particles. Crack retardation was observed in high sulfur content heat specimens, and the CGR decreases as the loading …
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The Propagation of Stress Corrosion Cracks in Alpha-Brasses
… front markings were produced on the resulting fracture surfaces and these showed that the crack front at the free surface did not lag behind the overall crack front. This indicated that the discontinuous propagation of the crack trace was representative of the subsurface cracking. The …
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The effects of hydrogen on the deformation and fracture behavior of the metastable beta-titanium alloy, TIMETAL(RTM) 21S
… No evidence for the formation of hydrides on fracture surfaces or in the stress fields of active cracks was found suggesting that the stress-induced hydride mechanism is not responsible for the observed transition. Therefore, the most viable mechanism is hydrogen-induced decohesion. Bulk …
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The effects of nitrogen and nickel on the microstructure and mechanical properties of 16 wt.% chromium stainless steels
… alloys in their various heat treated conditions. Fracture surfaces, and deformation markings on the tensile gauge surface, were examined in the scanning electron microscope, while cross-sections of fracture surfaces were examined using light microscopy. Dilatometric traces were obtained for the …
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Quantitative and consistent tests for interlayer adhesion in laminated glass
… of samples: low and high adhesion. Stress and fracture analysis was conducted using the finite element method. The numerical analysis was first validated against simple strength of materials analyses and the measured load deflection response. The numerical analysis then provided the variation …
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Metal-foam interface stability during the filling of lost foam moulds with aluminium alloys
… containing carbon deposits were found on the fracture surfaces of all the castings made and this suggested that the defect was caused by polymer entrapment. A Saffman-Taylor instability was observed at the interface between Hg and a viscous glucose syrup which were contained in an analogue, …
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Biologically reinforced geopolymer composites
… SEM analysis was employed to characterize fracture surfaces and mode of failure in the different sample sets.
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Polymer blends formed by the solid state mechanical alloying process
… the repeated welding, working hardening, and fracture of metallic powders to form an alloy. The research presented in this thesis describes the use of the MA process to form polymer blends. Until recently there has been no published work discussing the possibility of using this technique with …
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