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 23 for “"Displacement control"”.
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Non-linear finite element analysis of reinforced concrete panels and infilled frames under monotonic and cyclic loading. Structures under plane stress loading are analysed up to and beyond the peak load. Non-linear material properties including cracking, crushing and the non-linear behaviour at the interface of members are considered.
… technique performed under load or displacement control. The iterative techniques use the standard and modified Newton-Raphson method or the secant Newton method. An automatic load incrementation scheme, line searches, and restart facilities are included. The capabilities of the …
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Biomechanical biomarkers of cancer
… FEBio was used to create both force and displacement control confined compression tests of tissues modelled by collagen hydrogels. The tissue models contained a 'tumour' layer and the effects of varying the stiffness parameters of this 'tumour' layer were investigated. Any change in …
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Aplicação do M.E.F. na análise do colapso de tubulações submarinas para águas profundas
… method, and also employing a special displacement-control technique.
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Analysis of Instabilities in Microelectromechanical Systems, and of Local Water Slamming
… respect to time. For the static problem, the displacement control and the pseudo-arc length continuation (PALC) methods are used to obtain the bifurcation curve of arch's deflection versus the electric potential. The displacement control method fails to compute arch's asymmetric deformations …
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Development of a portable scratch test device for probing strength, ductility and structural distress in metal materials
… method is proposed and validated to perform a displacement controlled scratch experiment. A portable scratch testing device is designed and developed to utilize the displacement control technique along with specific instrumentation to allow for the continuous measurement of material properties …
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Inlet metering pump analysis and experimental evaluation with application for flow control
Axial piston pumps with variable volumetric displacement are often used to control flow and pressure in hydraulic systems. The displacement control mechanism in these pumps occupies significant space and accounts for significant cost in the pump design. Fixed displacement pumps have lower cost and …
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Investigation into the mechanical response and microstructure evolution of high density polyethylene, under conditions applicable to the injection stretch blow moulding process
… stress-strain response was investigated under displacement control, where a temperature change of 1°C within the temperature processing range was sufficient to significantly shift the stress-strain response. The post deformation results showed that the elastic modulus could be enhanced by a …
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Optimum Design of Composite Wing Spar Subjected to Fatigue Loadings
… in flight these forces repeatedly cause cyclic displacements which could ultimately lead to failure. It is important to design the wing spars which carry the bending loads, to be fatigue resistant so that damage or expensive inspections could be avoided.</p> <p>Wing models were be made from …
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Measurement of Surface and Interfacial Energies between Solid Materials Using an Elastica Loop
… a specially designed apparatus with a precise displacement control system, an analytical balance, an optical system, and a computer control and data acquisition interface is constructed. An elastica loop made of poly(dimethylsiloxane) [PDMS] is attached directly to a stepper motor in the …
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Behaviour of fracture process zones in concrete influenced by simultaneously applied normal and shear displacements
… peak behaviour of concrete expressed as stress - displacement curves. The theoretical basis of the thesis is in accordance with the "Fictitious Crack Model" which is a model based on the softening properties of concrete. The model was originally developed in order to describe the crack propagation …
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Development and implementation of an opensource DIC acquisition system, focusing on temporal synchronization with the Gleeble 3800
… electrical resistance heating for temperature control and a closed loop hydraulic actuator for displacement control. In order to extract greater accuracy and control of simulated processing parameters, the incorporation of a synchronised Digital Image Correlation (DIC) capability with equipment …
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Effects of Frame Design and Cab Suspension on the Ride Quality of Heavy Trucks
… airsprings and two dampers mounted vertically to control the vertical motion. The first suspension used two horizontally mounted dampers to control the lateral motion, while the second used a panhard rod connected to a torsion spring. In addition, two different sets of airsprings and two sets of …
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Damage characterization and modeling of notched graphite/epoxy sandwich panels in compression
… uniaxial quasi-static tests were performed in displacement control. Coupons consisted of various sized notched sandwich panels with woven Graphite-reinforced PMC facesheets and Nomex honeycomb cores. Two lay-ups were used in the facesheets: [45/0/0] and [0/0/0/], identified as T45 and TO …
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Precision control of continuous microcontact printing
… focus on the enabling of closed-loop force control of the printing process by the establishment of a deterministic computational platform and additional sensing. An understanding and rationale for the overall control design of the microcontact printing process is developed. Though the goal …
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Design, Modeling, and Analysis of Microscale Pneumatic Valve Architectures to Simplify Integration of Small Displacement Actuators
… majority of fluid power systems hinges on proper control valve function. Despite the importance, the core actuator technology used in control valves has remained largely unchanged for decades with incremental improvements made where possible. Now, conventional actuator technology development has …
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Failure of laterally crushed aluminum tubes under combined bending and tension
… zones of deformation are shown to develop under controlled conditions in specially designed crushing experiments of Al-6061-T6 cylindrical shells. In these experiments shells of finite length and radially constrained ends are crushed laterally by rigid punches. The crushing, which is conducted …
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Use of Compliant Interbody Force Sensing Grafts to Compare Load Sharing Properties of Unidirectional and Bidirectional Multilevel Dynamic Translational Anterior Cervical Plates
… bending, and left-right axial rotation under displacement control to a load limit of 3.0 Nm or 30 degrees of motion. Four different spine conditions were evaluated: the harvested (H) condition and three types of instrumented conditions containing two-level discectomy and graft at C4-C5 and …
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Displacement rate and temperature effect on asphalt concrete cracking potential
… of conditions including temperature and rate of displacement is needed. This thesis has two major objectives. First is to gain an overall understanding of fracture behavior of AC under a wide spectrum of temperature and rates of displacement. Second is to identify the combination of temperature …
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A unified library of nonlinear solution schemes: An excursion into nonlinear computational mechanics
… of nonlinear solution schemes including load, displacement, arc-length, work, generalized displacement, and orthogonal residual control are cast into a unified framework for solving nonlinear finite element systems. Each of these solution schemes differs in the use of a constraint equation for …
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Evaluation of a Novel Self-Assembled Nanocoating in Promoting Bone On-growth and Apposition on Metal
… ensures pullout in a uniaxial direction at under displacement control was used, and the resistive shear force at failure was measured. Mechanical testing showed no difference in the average of failure force of the coated group when compared to that of the uncoated group at each time point. There …
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