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Showing 1 to 20 of 41 for “"contact stresses"”.
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Contact stresses in conical shaped rollers
… when two conical shaped rollers come into contact, both over their contact surface region and inside the material. One of the most important findings of this thesis is that when two conical rollers push against one another, the resulting contact patch takes a trapezoidal-like shape due to …
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Contact Stresses in Dynamically Impacted Helical Springs
Made available in DSpace on 2014-12-14T14:42:10Z (GMT). No. of bitstreams: 1 7524429.pdf: 2446415 bytes, checksum: f4301dfc8ac331be154010761650a609 (MD5) Previous issue date: 1975
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Knee joint contact stresses : the influence of deformity and muscle activity
… plane has a significant effect on the joint contact stress. However, gait analysis demonstrated that factors other than alignment contributed significantly to the outcome of corrective surgery. It was therefore hypothesized that muscle contraction can alter the stress distribution within the …
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Influence of tire-pavement thermomechanical interaction on contact stresses and rolling resistance
… solving this problem begins at the tire-pavement contact. Traditionally, conventional design and analysis of tire and pavement are done separately, with limited consideration of their inherent coupling. This scenario is ubiquitous for both roadway and airfield pavements. Although numerical models …
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Finite element modeling of contact stresses during the indentation of wear resistant coatings on soft substrates
Includes bibliographical references (pages 152-161).
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Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions
… both are deformable bodies, while focusing on contact stresses, rolling resistance, and pavement responses. In addition to load and tire inflation pressure, temperature, speed, and rolling conditions were considered. A series of necessary advancements in the tire model, such as appropriate …
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The performance of high speed reciprocating polymer seals in water
… (UHMWPE) ring, energised to remain in contact with the reciprocating piston, using a nitrile rubber o-ring. The design of the seals is such that they do not facilitate the formation of a lubricating film, and the high contact stresses at the seal face due to the seal pressure cause …
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Analysis of tire-pavement interaction and pavement responses using a decoupled modeling approach
… for the accurate analysis of load-induced stresses and strains in the pavement structure. This dissertation focuses on the analysis of the mechanism of tire-pavement interaction and the effect of tire-pavement interaction on pavement responses using a decoupled modeling approach. First, an …
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Sustainable design of hydrocarbon refrigerants applied to the hermetic compressor
… were analysed to ascertain the tribological contact conditions for both R600a and R134a systems. A novel pressurised micro-friction test machine was developed to simulate the tribological conditions of the critical components using aluminium on steel samples. Refrigerant charges of R600a with …
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Effective Length of Fractured Wires and a Fatigue Analysis of Wire Rope
… initially concerned with a determination of the contact loads and stresses between the wires in a wire rope under axial loading. The rope is regarded as a collection of smooth helical rods. The determination of the contact stresses between wires is based on the solution of Hertz's contact …
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ANALYSIS OF MACHINING PROCESS USING THE FINITE ELEMENT METHOD
… accounted for. The distributions of tool-chip contact stresses and the cutting forces obtained in the present analysis agrees well with the experimental results of other researchers. It is postulated that in orthogonal machining, the chip assumes a thickness such that the total strain energy in …
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Response of multiple fastener composite joints: numerical and experimental results
… the range of experimental data. Distribution of contact stresses between the pins and the hole edges was also studied. Numerical analysis suggests that the prevalent assumption of radial cosine distribution of contact stress between the pin and hole edge is in substantial error. It can also be …
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Behaviour of model foundations on sand
… bolted steel box, instrumented to measure contact stresses and displacements at selected points. Three types of foundation/sand interaction cases were examined, namely: smooth surface, rough surface and smooth embedded.<br/>The sand used was Leighton Buzzard, placed under controlled …
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Performance of doweled concrete joints subjected to fatigue loading
… initiated due to the development of excessive stresses at the dowel/concrete interface. Recent studies indicated the existence of two types of stresses i.e. compressive stresses at the top and bottom of the dowel and tensile stresses at both sides of the dowel bar. These stresses are the …
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Contact of orthotropic laminates with a rigid spherical indentor
Three dimensional contact problems of square orthotropic laminates indented by a rigid spherical indenter are solved. Simplified problems of indentations of beam and isotropic square plate are studied first to develop an efficient numerical technique and to gather the knowledge of the shape of the …
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Characterization of stresses induced in doweled joints due to thermal and impact loads
… slabs can contract freely. The triaxial state of stresses that develop at the dowel concrete interfaces due to the application of mechanical and thermal loads has not been previously characterized. In this study a detailed Three-Dimensional Finite Element (3D FE) model was used to investigate the …
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Development of domain integral and generalized finite element methods for three dimensional analysis of near-surface cracking in flexible pavements
… thin flexible pavements, where tensile stresses and strains govern the behavior at the asphalt layer. However, elastic theories are incapable of predicting other pavement distresses, including near-surface cracking. Similarly, finite element method, which is equipped with fracture and …
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Elliptical Rolling Link Toggle Mechanisms for Passive Force Closures with Self-Adjustment
This thesis presents elliptical rolling contact joints as an alternative to circular rolling contact and conventional revolute joints where high quality force transmission "low friction and backlash" with variable output are desired. Parameters specific to the joint and its position are developed …
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Modeling Moisture-Induced Damage in Asphalt Concrete
… and strength testing of mastic materials. The contact stress is significantly higher in dry conditioned mastic-aggregate interface than in the wet conditioned interface for all load magnitudes and patterns. Lower contact stresses are one of the reasons for higher mastic-aggregate interface …
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Numerical Modelling of Ball Bearing Stiffness to Predict Contact Stress Caused by Vibration Induced Gapping
… of the ball with the races, which produce high contact stresses. These high stresses can cause indentation damage on the ball and the raceways, and may lead to malfunction of the bearing, and therefore the mechanism the bearing forms a part. Previous studies have develop a 2-DOF model in order …
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