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Showing 1 to 20 of 23 for “"shakedown"”.
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Limit and shakedown analysis of structures by the finite element method
Limit and shakedown analyses are powerful methods in designing pressure vessel components and other engineering structures. With the development of computer technology the use of finite element analysis as an alternative tool for engineering structure design has become ever more increasing. In this …
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Limit Analysis and Shakedown in Plane Frames and Plane Stress Problems
… method is developed for the determination of the shakedown load factor for elastic, perfectly plastic plane frames subjected to cyclic loading or random loads varying between fixed limits. The essential feature of the method is the employment of an automatic force method of elastic analysis which …
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Numerical and experimental investigation of shakedown in evolving non-Hertzian rolling contact
… parameters during this process is reported. Shakedown limits are obtained at different instants of the deformation process using Melan’s theorem. It is observed that the high stresses near the surface discontinuities greatly affect the shakedown limits. The actual stress state is observed to …
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The Elastic-Plastic and Shakedown Analysis of Tubes Subjected to Sustained and Cyclic Loads
… in this dissertation of the elastic-plastic and shakedown analysis of tubes subjected to various sustained and cyclic loads and temperatures. The first part of this dissertation gives a general formulation of the tube problem. Exact analytical elastic-plastic solutions are derived and programs …
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Acomodação estrutural na associação de cascas axi-simétricas sujeitas a pressões internas
… of determining the lower bound estimates of the shakedown pressure for flush radial cilinder-sphere intersections. Two elastic analysis methods were developed to find the stresses at the junction, where the most charged elements are situated. The shakedown pressure was achieved by applying …
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Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns
… clearly indicated the presence of the so-called shakedown effect with load wander governing the behavior of unbound aggregate layers. Also, it was noted that shakedown was more readily happening when the wander width was kept narrow. Especially in the 6-wheel sections, the residual deformations …
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The Design and Construction of a 20" x 20" Mach 2.0 Blowdown Wind Tunnel to Characterize the Lift and Drag of Irregularly Shaped Fragments
… the supersonic wind tunnel was assembled, and shakedown testing was conducted. During shakedown testing it was determined that the wind tunnel was capable of producing Mach 2 flow in the test section. Following shakedown testing, a flow survey was conducted in order to ensure uniform Mach …
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Análise limite de lajes via programação linear através do método dos elementos finitos
… Collapse) or independently from each other (Shakedown Analysis).
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Investigation of hot gas desulfurization utilizing a transport reactor
… reactor was built and underwent successful shakedown testing. In addition, a preliminary desulfurization test was successfully conducted with the unit. It was shown that a hydrogen sulfide-containing fuel gas could be cleaned from an initial hydrogen sulfide concentration of 1000 ppmv to …
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Permanent Deformation Behaviour of Unbound Granular Materials in Pavement Constructions
… this data a serviceability limit line (plastic shakedown limit) stress boundary for the unbound granular materials (UGM) was defined for different moisture contents. Below this line the material will have stable behavior. The serviceability limit line was applied in a finite-element (FE)-program …
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Modellierung des nichtlinear-elastischen Verformungsverhaltens von Tragschichten ohne Bindemittel
… durchgeführt wurden. Mit Hilfe der Shakedown-Theorie konnte belegt werden, dass sich ToB in unterschiedlichen Beanspruchungsbereichen nach verschiedenen Gesetzmäßigkeiten verhalten und dass Modelle zur Beschreibung des Verformungsverhaltens von ToB bereichsweise verschieden …
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Study on structural integrity of welded components using the LMM
… such as the welding residual stress (WRS) on the shakedown-ratchet limit interaction curves and the creep-fatigue endurance. With a welded flange case study, the effect of WRS on mean strain during the transient cycles and the fatigue damage at steady state is demonstrated.
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Evaluation of Hydraulic Separator Applications in the Coal and Mineral Industries
… of the testing programs (equipment setup, shakedown testing and detailed testing) associated with four coal plants and two phosphate plants are summarized in this work. In most of these applications, the high-efficiency units proved to provide a higher quality product at reduced costs when …
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Biocementation of Road Foundations: Element Testing, Physical Modelling, and Micro-Scale Characterisation
… exhibited a behavioural transition from a stable shakedown state to an unstable one, with biocementation found to exert opposite effects: improving deformation resistance and elevating the shakedown limit in the stable state but aggravating brittleness in the unstable state. Through the use of …
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Performance of Silty Sands and their Use in Flexible Airfield Pavement Design
… plastic, and ratcheting failure behaviours (i.e. shakedown boundaries), commonly used to help predict the lifespan of a flexible pavement, were examined. It was seen that cycling a silty-sand, the stress path and yield surface could change depending on the fines content. The Cambridge Airfield …
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Development and Testing of a Mobile Pilot Plant for the Advancement and Scale-up of the Hydrophobic-Hydrophilic Separation Process
… Initial investigations focused on the shakedown and design of key unit operations, including the agglomeration and de-emulsification (i.e. Morganizing) steps. Studies showed that the initial design of these units, namely pump induced mixing in agglomeration and packed bed emulsification …
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Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements
… Finally, this research described employs the shakedown concept to interpret laboratory single-stage repeated load triaxial permanent deformation test results performed at varying dynamic stress states and aggregate physical conditions. A stable permanent strain rate is highlighted to give a …
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Application of Optical Detection Methods for Top-of-Rail (TOR) Lubricity Evaluation on a Moving Platform for Revenue Service Track
… revenue service testing. This includes a shakedown run on a siding in Riverside, VA prior to conducting mainline in-service testing. Finally, this research thesis covers the in-service testing on revenue track conducted with the new third generation rail lubricity sensor and the …
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