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 40 for “"contact stress"”.
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Effects of Surface Irregularities on the Rolling Contact Stress Problem
Made available in DSpace on 2014-12-12T00:25:47Z (GMT). No. of bitstreams: 1 7212216.pdf: 1724787 bytes, checksum: 2bf0eb582dc2adeaedcab98427e90923 (MD5) Previous issue date: 1971
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Contact stress analysis and fatigue life prediction for a cam-roller follower system
… followler system as influenced by residual stresses induced by grinding, is developed. An approach based on an extended Hertzian analysis is used to determine the 3-D contact stress fields, which are then combined by elastic superposition with the residual stress fields. These residual …
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Lunar soil mechanics: distribution of contact stress beneath a rigid plate resting on sand.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1969. Sc.D.
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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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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 Analysis of Super Elastomer Mechanical Behavior and Failure for High Pressure Sealing Applications
… are also affected by the complex geometry/contacts, large sizes, and various static/dynamic loading conditions. Understanding the materials' behaviors and product performances of such sealing components are non-trivial and of critical application importance. In practice, the sealing …
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Nonlinear mixed finite element analysis for contact problems by a penalty constraint technique
… variational principle is developed for planar contact stress analysis. The formulation is based on the updated Lagrangian approach and accounts for geometric nonlinearity. In the mixed model, both displacements and stresses are approximated independently and this approach has in general been …
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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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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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Development of a Novel Cam-based Infinitely Variable Transmission
… follower velocity for a given application. The contact stress between the rollers and cam is the limiting stress within the transmission. A parametric study is used to quantify the relationship between this stress and the transmission parameters. Based off those results, two optimization …
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Human Knee FEA Model for Transtibial Amputee Tibial Cartilage Pressure in Gait and Cycling
… a transtibial amputation. Abnormal cartilage stress can cause higher OA risk, however it is unknown if there is a connection between exercise type and cartilage stress. To help answer this, a tibiofemoral FEA model was created. Utilizing linear elastic isotropic materials and non-linear …
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Optimization of the bottom plate of a ground-supported liquid storage tank
… segments of fixed radii is studied. Also, the contact stress distribution is investigated for the case of the three-segment plate. During the study, the results are compared to a uniform plate. As an outcome, the differential settlement is significantly improved compared to the widely used …
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An experimental study of frictional phenomena around the pin joints of plates using moire interferometry
Although contact problems with friction have received considerable attention in recent years, analytical as well as experimental limitations have tended to obscure some of their essential features. All the experimental techniques employed in the past lacked either required sensitivity or adequate …
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Maximum torque of combination threats for spur gear based on AGMA and JGMA standards
… and AGMA standards with high value of allowable contact stress compared to its allowable bending stress have a transformation curve from surface durability to bending strength when its torque values are plotted against number of teeth. This allows the forming of a combination threats curve for …
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A new metacarpophalangeal joint replacement arthroplasty
… methods like lubrication analysis and contact stress analysis studies, laboratory wear tests and finite element analysis studies have been used for the evaluation of the final design. In this study a new metacarpophalangeal joint replacement has been proposed. The new implant is …
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Kinematic alignment of precision robotic elements in factory environments
… traditional design parameters such as Hertzian contact stress and preload. To test out the application of kinematic couplings to detrimental environments, two separate case studies were performed. The first case study consists of a small scale metrology device used to calibrate the home position …
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Theoretical analysis and experimental investigation of contact fatigue and surface damage in prealloyed and diffusion bonded sintered steels
The contact fatigue and surface damage of prealloyed (Fe-0.85Mo, Fe-1.5Mo) and diffusion bonded (Ni-free, low-Ni, high-Ni) powder metallurgy (PM) steels were investigated. Materials subjected to contact stress fail due to the nucleation of subsurface cracks (contact fatigue cracks), nucleation of …
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Genetic algorithm optimisation of load cell geometry by finite element analysis
… only sensitive to the axisymmetric components of contact stress distribution. The problem of cylindrical load celis subject to frictionless equipollant annular loading is analysed by the method of superposition of the homogenous solutions. A plot of the relationship between sensitivity, load …
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Three-dimensional boundary element and experimental analysis of lubricant ceramic surface ring cracks in rolling contact.
… creates difficulties in predicting rolling contact fatigue (RCF) life. The influence of the lubricant, contact pressure and crack geometry on the RCF mechanism is difficult to determine due to the variable nature of RCF life when the crack location is not defined. In this study, rolling …
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Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire
… part refers to the prediction of pavement distress propagation over time using transfer functions. Transfer functions link critical pavement responses to particular pavement distresses. Although MEPDG analysis provides a theoretically framework for pavement simulations, its limitations and …
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