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 22 for “"Surface integrity"”.
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Surface integrity evaluation and the effect of machining-induced surface integrity characteristics on part's performance
Surface integrity (SI) is the integrated surface behavior and condition of a material after being modified by a manufacturing process; it describes the influence of surface properties and characteristics upon material functional performance. As the leading-edge field of manufacturing research, SI …
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Surface integrity of laser cutting nitinol shape memory alloy
… was instrumented to experimentally investigate surface integrity of Nitinol. In addition, the process window for optimal surface integrity was identified. (5) Tensile and fatigue testing was conducted to evaluate the impact of surface integrity including thermal damage of laser cut Nitinol on …
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The effect of abrasive properties on the surface integrity of ground ferrous materials.
… To avoid temper colours on the workpiece surface the maximum background temperature must not exceed 450 to 500deg. C. for commonly used ferrous materials.
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Model based simulation of broaching operation: cutting mechanics, surface integrity, and process optimization
… because of its high productivity and attainable surface quality in comparison to the other machining processes. The objective of this thesis is to simulate the broaching operation and use the results to present a methodology for optimum design of the broaching tools. In the course of the …
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Processing-surface integrity-fatigue relationship in electrical discharge machining of nitinol shape memory alloy
… geometry, delicate micro features, and superior surface integrity are very stringent for Nitinol components. Electrical discharge machining (EDM) is a competitive technique to machine difficult-to-cut materials. The contact free nature between the workpiece and the electrode avoids severe tool …
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Surface integrity and energy consumption in machining of inconel 718 produced by selective laser melting
… plague AM such as low dimensional accuracy, high surface roughness, and large tensile residual stress. Ongoing efforts to improve part quality through process optimization of parameters such as scan speed and laser power, post heat treatment, or machining, are currently being pursued to mitigate …
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Effect of cutting tool microgeometry when milling hardened steels, a finite element simulation and surface integrity analysis
… of cutting inserts on the cutting forces and the surface integrity. Two levels of feed rate, three levels of cutting speeds, and five levels of edge radii were utilized. The impact of edge radii on the workpiece surface integrity was analyzed in terms of 2D surface roughness, generated feed marks, …
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Improvement of machinability and surface integrity during electro discharge machining of inconel 718 using nano powder suspension dielectric
… rate (MRR), electrode wear rate (EWR), and surface roughness (Ra) were experimentally investigated. Some aspect of surface integrity, such as recast layer (RL) and microhardness (MH) were also evaluated. The circulating dielectric system called High Performance EDM (HPEDM) was used when …
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Sustainable Machining of Aerospace Alloys for Improved Product and Process Sustainability: Evaluation of Dry, Near-dry (MQL) and Cryogenic Machining Processes
… for the product performance. In this context, surface integrity plays a key role because it dictates the functional performance and service-life of engineered components. Hence, knowledge about factors that cause microstructural improvements will contribute to a better fundamental understanding …
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Drilling of carbon fibre reinforced plastic composites
… hole size and geometrical accuracy, workpiece surface integrity and chip morphology.
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Investigation On the Surface Morphology Of Metal Anodes In Zinc Air Batteries With Non-Aqueous Aprotic Deep Eutectic Solvent Electrolytes
… non-aqueous electrolytes are expected to improve surface integrity of zinc electrodes over cycling. This work aims to examine the morphology of the disassembled electrode and issue a statement on the viability of this electrolyte.
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The machinability of a gamma titanium aluminide intermetallic
… life/wheel wear, forces, power, and workpiece surface roughness). Taguchi main effect plots are detailed, together with Analysis of Variance (ANOVA) data and percentage contribution ratio (PCR) values. In addition, workpiece surface integrity evaluation including assessment of microstructure …
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SUSTAINABLE FACE MILLING OF INCONEL 718 USING MQL AND NANOFLUIDS MQL WITH VEGETABLE OIL AS BASE FLUID
… rapid tool wear, shorter tool life, and poor surface integrity). Conventional flood coolant (CEC) used in industry is environmentally unfriendly, hazardous to operators, and unsustainable. These problems motivated this research, which can be mitigated with the use of effective biodegradable …
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Cure Kinetics of Two Part Epoxy Resin and the Effect on Characterization of Thermal Barrier Coatings
… mounting which is a critical step to protect the surface integrity and edge retention of the coating during grinding and polishing. The curing kinetics of a slow cure two part epoxy was investigated and the TBC samples were mounted and cured at heating rates of 2, 5, and 10°C/min to 55°C and 70°C. …
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Effects of chromium powder mixed in electrical discharge machining of AISI D2 hardened steels
… of EDM will cause lower productivity and poor surface quality. EDM becomes most apparent by using powder metallurgy electrode together with chromium (Cr) powder suspension into the dielectric fluid which has led to the increasing of productivity and good quality performance and characteristics. …
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Influence of agglomeration phenomenon in machining of AISI D2 hardened steel using nano chromium powder mixed-EDM
… dielectric liquids impedance, machinability, and surface integrity problems. Also, the additive powder particles played a vital role in this enhancement. Nevertheless, this environment suffers from the powder agglomeration phenomenon, as abnormal behaviour, resulting in the dropping of the …
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Influences of surface quality on the rolling contact fatique behaviour of ceramics
… the finishing process parameters in relation to surface quality, as well as the feasibility of accelerating the finishing process of HIPed silicon nitride balls. The kinematics of the eccentric lapping were analysed and discussed. Taguchi Methods were used to optimise the finishing parameters to …
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The Mechanism of Action of Hyaluronan Therapy as a Treatment for Osteoarthritis and the Assessment of Osteoarthritic Articular Cartilage Using Ultrasound
… (GLCM) textural features to quantify cartilage surface integrity and internal microstructural organisation. This approach was validated in 30 human participants, enabling identification of ultrasound-based biomarkers related to articular cartilage degeneration in osteoarthritis. Additional …
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Autonomous unmanned aerial vehicle for non-destructive testing
… is a visual NDT method used to quantify surface integrity and detect discontinuities in a structure's coating. Compared with traditional inspections from offline images, a 3D photogrammetric inspection provides results with intrinsic position and location information, which is essential …
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Design and analysis of the internally cooled smart cutting tools with the applications to adaptive machining
… material removal rate, low tool wear and better surface integrity. The absence of cutting fluid in CFM causes the cutting tool and the workpiece subject to great thermal loads owing to higher friction and adhesion, and as a result may increase the levels of tool wear drastically. The increase in …
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