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 26 for “"wear testing"”.
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Abrasive wear testing of steels in soil
… A rig has been designed for the abrasion testing of materials in soil. The reproducibility of the method has been shown to be high and an evaluation has been made of the relative wear resistance of a series of ·heat treated steels. A medium carbon boron steel has been shown to have great …
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Design of a Cyclic Sliding, Dynamically Loaded Wear Testing Device for the Evaluation of Total Knee Replacement Materials
… of up to seven times body weight. However, most wear testing machines that have been used to evaluate total knee replacement materials are unidirectional and/or apply only static force. This thesis presents an alternate wear testing device capable of simulating the most prevalent motions of the …
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Use of physiological and perceptual dimensions of clothing comfort to evaluate nonwoven protective fabrics through wear testing of limited-use coveralls
… the skin. Five fabric types were evaluated by wear testing coveralls and measuring selected physiological and perceptual responses of five subjects performing moderate-intensity exercise in thermoneutral and hot, humid environments. Physiological responses included skin temperature, body …
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An evaluation of the muzziness characteristics of certain wool and wool blend fabrics
… procedure, consisting of two variations, and a wear test method for wrinkling fabrics. The intent of the laboratory testing was to have the results obtained simulate those received from the wear test, thus alleviating the need for future wear testing. The· fabrics tested were three Dacron® …
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Friction and Wear of Polytetrafluoroethylene/Graphene Oxide Composite Thin Films
… inertness. As a polymer, PTFE suffers from high wear and low adhesion to substrates limiting its use as a thin film. Thin PTFE films are ideal candidates for solid lubrication in micro-machines and bearing applications. The main goal of this work is to enhance the durability of thin PTFE films …
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The wear of materials in an ash conditioner
… and maintenance costs in ash-water mixing plant. Wear testing has been carried out in situ using a variety of generic materials. A ranking order of wear performance has been established both as a function of material and operating costs, and it has been demonstrated that impressive cost savings …
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The Effect of Equal Channel Angular Extrusion (ECAE) and Boron Additions on the Mechanical Properties of a Biomedical Ti-Nb-Zr-Ta (TNZT) Alloy
… and subjected to tensile, fatigue, and wear testing. It was found that ECAE has a beneficial impact on all of the properties tested. The modulus value was increased by approximately 25 percent, but it is still well below the value of other prosthesis materials.
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Tribological and Structural Characterisation of Ceramic on Metal Hip Replacements
… hip replacements was carried out using in vitro wear testing methods. Two ceramic materials, pure alumina and an alumina matrix compound (zirconia toughened alumina (ZTA)), were articulated against as-cast CoCrMo alloy cups. The diameter was changed from 38 mm to 60 mm to explore the effect of …
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COLD SPRAYED COATINGS WITH DUAL NANOPARTICLE REINFORCEMENTS FOR WEAR AND CORROSION PROTECTION
… mechanical material properties of a substrate in wear resistance. Micron- and submicron-sized particles are beneficial, but due to their low relative surface areas, they tend to exhibit pull out more often and do not adhere to a substrate as well as a nanoparticle. Using nanoparticle metal and …
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The abrasive wear resistance of austempered spheroidal graphite irons
… has been made of the structure and abrasive wear resistance of two austempered commercial spheroidal cast irons. Heat treatments have been carried out for different times between 2 and 120 minutes for a range of austenitising temperatures between 850°C and 950°C and austempering temperatures …
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Mechanical properties of a new zinc-reinforced glass ionomer restorative material
… toughness. Methods: Fracture toughness (KIC) testing was done according to ISO 13586, using single edge notched-beam specimens (n=10), loaded until failure in a three-point bending test device. Specimens (n=9) for the hardness, roughness and abrasive wear testing were made by mixing and …
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The sliding wear of polymers against steel
A laboratory wear testing facility has been developed to generate wear rate data for polymeric materials sliding at constant velocity against a hardened stainless steel base. The polymers investigated were ultra high molecular weight polyethylene (UHMWPE), ultra high molecular weight …
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Wear of ultra-high molecular weight polyethylene manufactured with laser powder bed fusion
… pin specimens and perform pin-on-disc wear testing against stainless steel countersurfaces. We measure wear as a function of sliding distance for 3D-printed UHMWPE specimens of different density and compare the results to those of conventionally extruded and machined UHMWPE specimens. …
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Synthesis and Characterization of Ag and Cu doped DLC Thin Films for Anti-microbial Applications
… Rockwell C indentation, and pin-on-disk wear testing against ultra-high molecular weight polyethylene (UHMWPE) countersurfaces in a 0.9 wt.% NaCl solution under a 10 N load. The electrochemical corrosion performance was investigated using potentiodynamic polarization tests. The results …
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The production and tribology of hard facing coatings for agricultural applications
… with Chapmans Agricultural Ltd. Abrasive wear is a significant issue in many industries but is of particular significance in agriculture. This research is being carried out due to the demand for a hard wearing, economical coating for use in the agricultural industry. A primary objective …
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Quenching and partitioning of plate steel: development of design methodologies
… containing austenite to enhance toughness and/or wear resistance. The applicability of the Q&P process to plate steel has been explored in this work, considering through-thickness thermal profiles and associated microstructural gradients. Thermal gradients which develop in thick plate are much …
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Wear and Corrosion Resistance Improvement of CoCrMo alloy by Tantalum Based Coatings
… after 15 years of service due to the excessive wear of the polyethylene liner and corrosion of the metallic ball which causes osteolysis, inflammation, and loosening of the implant components. Coating the metallic femoral head is one of the most promising techniques to reduce the wear of the …
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Quenching and partitioning plate steel for wear and toughness applications
… to produce low-alloy steel plates with increased wear resistance and toughness for use in the mining and earth moving industries. This work investigates the application of Q&P heat treatments to 18 mm thick low-alloy steel plates to obtain microstructures containing martensite and retained …
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The feasibility of diamond-alumina as a wear resistant material
Please read the abstract in the section 00front of this document
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Niobium in Microalloyed Rail Steels
Rail steels rely primarily on possessing adequate wear and rolling contact fatigue resistance. These properties, together with the toughness, can in principle be optimized by implementing thermomechanical processing assisted by controlled niobium additions. The purpose of the current work is to …
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