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 19 of 19 for “"Wear model"”.
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An analytical tool wear model for drilling of continuous fibre reinforced composites
… aircraft manufacture and high rates of tool wear are experienced in commercial practice. Unmonitored tool wear can lead to increased cutting forces, heighted cutting temperatures, and subsequently, delamination, fibre pull out or thermal degradation of the polymer matrix. Understanding the …
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Modeling of two-body fatigue wear of cylinder liner in internal combustion engines during the break-in period and its impact on engine lubrication
… the cylinder liner and the piston rings. The wear of cylinder liner not only leads to surface damage, but also results in the change of liner lubrication conditions. Therefore, a large number of tests are performed by researchers to investigate the liner wear process and its impact on engine …
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On the fretting wear of nuclear power plant heat exchanger tubes using a fracture mechanics approach : theory and verification
… observed in trying to identify the tube wear in heat exchangers. It is seen that the associated error could be an order of magnitude higher than the expected value, indicating the possibilities of failure at less than the predicted design life. Hence, the use of the commonly accepted …
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A computational approach to the prediction of wheel wear profiles
Wheel wear profiles are interesting for both economic and performance reasons. A good wheel profile design should be able to resist wear and to allow stable vehicle running. The ability to resist wear reduces the wheel reprofiling and replacement cost. The ability to allow stable vehicle running is …
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Investigation of Severe Abrasive Truck Tyre Wear
In the design of tyres, rolling resistance and wear resistance cannot be optimized at the same time. Tyres with high rolling resistance have good wear performance and good adhesion, whereas tyres with low resistance have poor wear performance and poor adhesion. It is therefore necessary to …
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Integrated Experimental Methods and Machine Learning for Tire Wear Prediction
A major challenge in tire research, is tire wear modeling. There are too many factors affecting tire wear, and part of those factors are difficult to be accurately expressed in physics and math. The objective of this research is to develop a machine learning based rubber sample wear model, and find …
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Modeling the lubrication of the piston ring pack in internal combustion engines using the deterministic method
… of the ring liner lubrication through numerical modeling. A twin-land oil control ring lubrication model and a top two-ring lubrication model are developed based on a deterministic approach. The models take into consideration the effect of both the liner finish micro geometry and the ring face …
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Discrete element method simulation of wear due to soil-tool interaction
… using a relatively new method to study soil-tool wear which could drastically reduce the time and associated costs of traditional wear studies. The goal was to utilize discrete element method (DEM) simulations to recreate the results of a circular soil bin test in order to develop a relationship …
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Discrete element method modelling of particle breakage and wear in High Pressure Grinding Rolls
… This study aims to develop a comprehensive model based on the discrete element method (DEM) to investigate the grinding process of HPGR and understand the underlying mechanisms. A laboratory-scale geometrical model of the HPGR mill was developed and the dynamic response of the rolls in the …
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Prediction of wheel wear profiles by analytical methods
A method is presented for the prediction of the wear history of a train wheel by a numerical simulation. The method consists of three fundamental steps. First, the wheel/rail contact geometry is characterized. Contact points, Herzian contact patch area and creep coefficients are determined as …
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Development of Comprehensive Experimental, Analytical and, Numerical Methods for Predicting Rubber Friction and Wear under Thermomechanical Conditions
… and the vehicle in general. Friction and tread wear are two of these contact characteristics. Considering the tire's functionality, for most applications, it is desired to have higher friction to have better traction and a lower wear rate to minimize the material loss of the tread. The friction …
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Wear at high sliding speeds and high contact pressures
Metal on metal wear at high sliding speeds and high contact pressures results in the melting of one or both of the sliding solid bodies due to heat generated at the contact interface. Understanding the influence of sliding speeds, contact pressures and material properties on wear rates is important …
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Estimating and interpreting shoe sole wear for forensic investigation
… shoemark images is presented for use in shoe wear experiments, captured over a period of five months. Using this data two computational solutions are designed; first in the spatial domain using SIFT, an approach previously proven in shoemark classification, and subsequently using a novel ridge …
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Modeling abrasive wear of a 3D printer extruder drive mechanism
… wore down with very little use. An abrasive wear model of the extruder shafts was developed in order to determine the theoretical lifetime of the shafts given a certain material hardness. The wear rate of the shafts is proportional to the hardness of the material and the square of the …
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An investigation of friction and wear mechanisms in selected thermoplastics
… Microscope (SEM) observations of abrasive wear of a polymer disk sliding against metal asperity models. The investigator was unable to observe actual particle formation but did identify elastic and plastic deformation of the polymer, and a debris buildup and extrusion process occurring at …
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Evaluation and analysis of wear in progressive cavity pumps
… with optimised material selection, for both wearing parts, at a competitive price.Wear is not an intrinsic material property and its value is dependent upon the conditions within each individual tribological system. In order to improve or optimise the wear life of a system, it is first vital …
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Enhanced engine mechanical efficiency through tailoring of lubricant formulations to localized power cylinder wall conditions
… without an accompanying increase in engine wear. An array of different base oil viscosity modifier type combinations were developed, tested, and analyzed in order to seek trends that link lubricant mixtures to certain rheological behaviors along the cylinder wall of a fired internal …
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The development of rail-head acoustic roughness
A model of the development of rail-head acoustic roughness on tangent track has been formulated. The model consists of a two-dimensional time domain wheel-rail interaction force calculation, with the normal force used as the input to a two-dimensional rolling contact and wear model. The possibility …
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Modelling and simulation of themo-mechanical phenomena at the friction interface of a disc brake.An empirically-based finite element model for the fundamental investigation of factors that influence the interface thermal resistance at the friction interface of a high energy sliding pair in a disc brake.
… measurements of temperature and the associated modelling and simulation of heat transfer in a brake friction pair. For a disc brake, an important parameter that was identified from the literature study is the interface tribo-layer (ITL), which has been modelled as an equivalent thermal …