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 110 for “"Mechanical Tests"”.
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Study of the mechanical and metallurgical properties of AMDRY 9954 HVOF coated Ti-6A1-4V alloy
… In the present study, the metallurgical and mechanical properties of High Velocity Oxygen Fuel (HVOF) thermally sprayed AMDRY 9954 (Cobai.Ni32Cr21Al8Yo.5) superalloy powder on Ti-6A1-4V alloy are examined. The mechanical tests include three point bending, tensile, fatigue, indentation, and …
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Experimental and Numerical Investigation of the Mechanical Properties of Novel Bamboo-Timber and Bamboo Composites for Sustainable Construction
This research examines the mechanical behaviour of laminated bamboo and hybrid bamboo timber composites that were developed as sustainable alternatives to conventional construction materials. Thirty-six specimens were manufactured using a novel combination of bamboo and pinewood strips. The …
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Design of fixtures and specimens for high strain-rate tensile testing on a drop tower
Drop towers are used to perform mechanical tests at strain rates similar to those experienced in automobile crashes. By their nature, drop towers are configured to perform compression tests only. This project aims to design a set of fixtures and specimens to allow the machine to perform tensile …
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Compósito reforçado com sisal para aplicação na moda
… to be subjected to traction and flexion. The mechanical properties of traction and flexion in three points were performed in the Laboratory of metal and mechanical tests of Materials Engineering of UFRN. The resulting samples from the tests were evaluated in scanning electron microscope (SEM) …
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Energy theorems and bounds in linearized elasticity with residual stress
… information so as to develop nondestructive mechanical tests that provide information about the residual stress fields in bodies that respond in a linearly elastic manner to small deformations from the residually stressed state. In order to construct the necessary background, a number of …
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Smoking and dose-dependent early effects of nicotine on bone mechanical properties and histology
… the effects of nicotine and cigarette smoke on mechanical properties of cortical bone. Experiments were conducted for 5 weeks with New Zealand White Rabbits. The first experiment of 18 rabbits studied the effect of nicotine levels delivered via a nicotine patch (5.25, 10.5, 21 ng/ml), measured …
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Quantitative Fracture Strength of Lithiated Tin Oxide Nanowires by In-Situ SEM Tensile Experiments
… from in situ scanning electron microscope (SEM) mechanical tests using a micro electromechanical system (MEMS) uniaxial tensile testing device. Stress values were calculated from load and displacement data from an inSEM nanoindenter tip while strain values were obtained using digital image …
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Determination of the Mechanical Properties of Electrospun Gelatin Based on Polymer Concentration and Fiber Alignment
… and the rotational speed of the target mandrel. Mechanical tests were aiso performed on these samples. Results were analyzed by Three-way ANOVA. It was determined that starting gelatin concentration, mandrel speed, and direction of fiber alignment interact together to produce effects on the …
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In Process Measurement of Hydrogen In Welding
… diffusible, hydrogen dissolved in welds on their mechanical properties have been known for over four decades. However, post weld inspection and repair of hydrogen induced cracks in welds remains the only means of correcting the defects produced by excess hydrogen in the arc atmosphere during …
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Formulation of oral dosage forms by three dimensional printing
… constructed with a permeable polymer as binder. Mechanical tests showed that the tablets were comparable to industry references for both strength and friability. A USP dissolution method involving an acid and buffer stage was used for extended-release studies. Release by diffusion was found to …
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CMZP and Mg-doped Al2TiO5 Thin film Coatings for High Temperature Corrosion Protection of Si3N4 Heat Exchangers
… analyses based on weight loss measurements and mechanical tests indicated better corrosion resistance and strength retention for CMZP coated Si3N4 compared to as received and Mg-doped Al2TiO5 coated Si3N4. This difference was attributed to the protective nature of the corrosion layer, which in …
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Nano-filled Epoxy: Mechanical and Fire Behavior and Modeling of Nanocomposite Columns Under Fire
In this work, fracture, mechanical, and flammability tests, along with a modeling of the stability of nanocomposite columns under fire are presented for nano-filled Diglycidyl Ether of Bisphenol A epoxy. The nanofillers used are montmorillonite nanoclays and carbon nanofibers. Three types of …
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Characterization of the mechanical properties of tactors used in tactile displays
… substrate, named Skinsim, was selected based on mechanical tests to have similar material properties to skin. It was found that when the motors were mounted on Skinsim their frequency of vibration was reduced by 62%. Measurements of the effects of damping in Skinsim led to the recommendation that …
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Experimental characterization and modeling of the plastic behavior of a thirdgeneration advanced high strength steel sheet
… to be commercialized. In this work, several mechanical tests were performed to analyze the plastic behavior of a coldrolled Gen3 980T steel with a nominal thickness of 1.58 mm. The mechanical properties and the plastic anisotropy Lankford coefficients were obtained from uniaxial tensile …
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The tear behaviour of some tri-block copolymer elastomers.
… and low angle X-ray scattering.Dynamic mechanical tests, on sheet material cast from different solvent systems, in both shear and tension over a wide temperature range, and static tensile tests at +20°C, revealed significant differences in viscoelastic properties between the …
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Supercritical CO2 foamed biodegradable polymer blends of polycaprolactone and Mater-Bi.
… in the foaming temperature respectively. Mechanical tests; tensile, compression, shear and impact were performed on the foamed samples. It was noted that between the 20-25% wt. MB, there was an improvement in the mechanical properties. This suggests that at these compositions, there is a …
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Plastic Instability Due to Collective Dislocation Effect in Portevin-Le Châtelier Effect and Dislocation Nucleation
… experimental part of the work, two creep-type mechanical tests have been conducted on a Cu-10at.%Al single crystal and a Mg single crystal to study the plastic instability in the PLC effect and dislocation nucleation respectively. The deformation modes of Cu-10at.%Al single crystal at different …
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The mechanical properties of tightly woven carbon-carbon composites
<p>The mechanical properties of a tightly woven carbon- carbon composite were investigated. The flexural strength and fracture toughness of these composites were measured as a function of temperature and atmosphere. The average flexural strengths are 147.1 ± 6.4 MPa in air and 144.0 ± 5.9 MPa in …
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Controlled release of Isothiazoline biocides from industrial minerals
… with varying degree of success. Optical and mechanical tests performed on paint films containing various minerals suggested there were no significant differences between the films. Rheology tests demonstrated that newly developed formulations were easy to apply to a surface.
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NDT to characterize 3D printed concrete interlayer bonds
… weakly bonded, and disbonded categories based on mechanical tests applied to the samples to measure bond strength. Two of those NDT methods, x-ray radiography and multi-element array ultrasonics, showed promise in characterizing bond strength, and threshold values for data from both methods were …
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