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 60 for “"Four-Point Bending"”.
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Evaluation of ceramic candle filters degradation and damage location using four-point bending tests
… order to confirm the dynamic response analysis, bending tests were performed to estimate the Young's modulus from the load-deflection curve and compared the results with the predicted values from vibration analysis. Four-point bending tests were conducted on seven intact filters, which included …
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Experimental Investigation Of Fatigue Behavior Of Carbon Fiber Composites Using Fully-Reversed Four-Point Bending Test
… the main methods to predict fatigue life is the four–point bending test. In most previous works, the tests have been done in one direction (load ratio, R, > 0). In the current work, we have designed and manufactured a special fixture to perform a fully–reversed bending test (R = …
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Characterization of Ultra-High Performance Concrete Tension Behavior Using Different Test Methods
… and standardized. Direct tension (DT) and four-point bending (4PB) test methods are two commonly used methods in research and practice to assess the tension behavior of fiber-reinforced concrete. This thesis work provides a comprehensive analysis of the experimental investigation, test …
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Influence of design and coatings on the mechanical reliability of semiconductor wafers.
… the bulk mechanical properties of a wafer. Three-point bending was used to evaluate the laser scribe density and chemical processing effect on wafer strength. Drop and strike tests were employed to investigate the edge bevel profile effect on the mechanical properties of the wafer. To characterize …
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Mechanical behavior of dip-brazed aluminum sandwich panels
… cellular cores of varying shape. Compression and four point bend tests were performed on sandwich panels with square and triangular honeycomb cores. These honeycombs were made of perforated aluminum sheet of repeating diamond and hexagonal patterns. The sandwich panel assemblies were joined via …
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Relationship of Mechanical Deformations and Electrochemical Properties of Lithium Ion Batteries-An Experimental Study
… cells were subjected to indentation to the point of mechanical failure. Second, pouch cells were subjected to three different four-point bending conditions, and cycled through 10 charges and discharges. Upon completion of the cycling, the pouch cells were removed from the four-point bending …
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Adobe materials for structural walls
… properties and wallette elements undergoing four-point bending. Ninety-four mortar cubes of varying material makeup, age, and drying environments were tested in compression. It was found that controlled drying conditions and the addition of asphalt emulsifier had the most significant effect …
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Rehabilitation of timber railroad bridges using glass fiber reinforced polymer composite wraps
… recovery of strength of repaired timber beams, four full scale (8&inches; x 16&inches; x 12&feet;) timber stringers were tested in a controlled laboratory setting in four point bending configuration. Two control specimens were tested to failure in bending. The specimens were then repaired using …
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Novel techniques for fracture monitoring in crystalline rock
… under two different loading conditions, three-point and four-point bending. Digital Image Correlation (DIC) was used to identify and calculate the dimensions of the fracture process zone. The study of fracture and fracture processes in granitic specimens through DIC is challenging due to the …
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Distributed Sensing for Monitoring Cast Iron Pipe Behaviour
… of Kingston, Hamilton, and Toronto in Canada. Four of these 150 mm diameter pipe specimens, with a length of 2.2 m, were instrumented with distributed fibre optic sensors (three circumferential fibres around midspan and five longitudinal fibres along the crown, springlines, and invert) and …
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Development and Validation of a Bidirectionally Coupled Magnetoelastic FEM Model for Current Driven Magnetostrictive Devices
… was used to simulate actuator load lines and four point bending results for Galfenol, which were then compared to experimental data. The model also captured the ΔE effect in Galfenol. The BCMEM can be used to study and optimize the design of future current driven magnetostrictive devices.
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Damage evaluation in dimension limestone using nonlinear ultrasonics
… levels of temperature was also obtained using four-point bending tests. Results using the currently used non-collinear ultrasonic wave mixing approach correlate well (R2 = 92%) with the corresponding obtained reduction in strength, and with results obtained using different transducer …
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Bending behavior of concrete T-beams reinforced with glass fiber-reinforced polymer (GFRP) bars
… reinforcement configurations were tested under four point bending to study the factors cited above. Shear lag effect was established based on the strains measured along the width of compressive flange at mid-span. Based on the test results and theoretical evaluations, design equations to predict …
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Fatigue Behavior Of Continuous Fiber-Reinforced Composite Beams
… stages of fatigue life. The results of the four-point bending fatigue tests show that the material follows different failure mechanisms depending on the stress level applied to the beam and failure mode changes from compressive failure at high stresses to tensile failure at low stresses. …
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Investigation of composite façade mullions
… aluminium and polyamide and composite beam bending were investigated and appropriate methodologies were adopted. To investigate the behaviour of the thermal break façade mullions, a typical mullion section was studied. This is a symmetrical composite section made of external and internal …
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Reliability and failure analysis of composite beams and plates containing stress concentrations
… For stress analysis of isotropic beams under four point bending and composite plates under in-plane loading, a finite element analysis program F2DELAST based on two-dimensional elasticity theory was developed and verified with existing literature and also by a commercial finite element code …
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Deformation Localization in Constrained Layers of Metallic Glasses: A Parametric Modeling Analysis
… stress-strain response. Random perturbation points are added to the metallic glass model to facilitate the formation of shear bands. The modeling result suggests that the mechanical behavior of metallic glasses can be significantly influenced by the geometrical confinement. Under nominally …
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JOINING OF CERAMIC COMPOSITES AND ADVANCED CERAMICS
… comparison quite impossible. The asymmetrical four point bending test (ASTM C1469-10) is recommended as a standard test by the ASTM to test joined ceramics and composites, but notches have to be cut in the joined area when the joining material strength is high. When the shear strength of the …
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Thermoneutral Housing Did Not Impact the Combined Effects of External Loading and Raloxifene on Bone Morphology and Mechanical Properties in Growing Female Mice
… tomography (µCT) and mechanical properties via four-point bending and fracture toughness testing. Results indicated a combined improvement by external loading and raloxifene on geometry, particularly in the cancellous region of the bone, and also in bone mechanics leading to greater improvements …
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Characterization and applications in infrastructure of steel reinforced polymer and grout composites
… SRG has been investigated experimentally using four-point bending. Analytical models based on the first-order and higher-order shear deformation theories have been developed to predict the behavior of the retrofitted RC beams. Comparisons between the analytical models and the experimental …
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