Spelling suggestions: "subject:"bechanical properties"" "subject:"amechanical properties""
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Investigation of the mechanical behaviour of TRIP steels using FEMSierra, Robinson. January 2006 (has links)
No description available.
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Understanding speech motor control in the context of orofacial biomechanicsShiller, Douglas M. January 2002 (has links)
No description available.
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Optical Spectroscopy of Nanostructured MaterialsHartschuh, Ryan D. January 2007 (has links)
No description available.
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Sintering microstructure and mechanical properties of PM manganese-molybdenum steelsYouseffi, Mansour, Mitchell, Stephen C., Wronski, Andrew S., Cias, A. January 2000 (has links)
Yes / The effects of 0·5 wt-%Mo addition on the processing, microstructure, and strength of PM Fe–3·5Mn–0·7C steel are described. Water atomised and sponge irons, Astaloy 1·5Mo, milled ferromanganese, and graphite were the starting powders. During sintering in 75H2 /25N2 or pure hydrogen the dewpoint was controlled and monitored; in particular the effects of improving it from -35 to -60°C were investigated. Faster heating rates (20 K min-1), sufficient gas flowrates, milling the ferro alloy under nitrogen, a low dewpoint (<-60°C), and a getter powder can all contribute to the reduction or prevention of oxidation of the manganese, in particular formation of oxide networks in the sintered steels. For 600 MPa compaction pressure densities up to 7·1 g cm-3 were obtained; these were not significantly affected by sintering at temperatures up to 1180°C. The sintered microstructures were sensitively dependent on the cooling rate. Irrespective of the presence of Mo, slow furnace cooling at 4 K min-1 resulted in mainly pearlitic structures with some ferrite and coarse bainite, whereas fast cooling at 40 K min-1 produced martensite and some retained austenite, very fine pearlite, bainite, and some ferrite. Young's modulus, determined by tensile and ultrasonic tests, was in the range 110–155 GPa. Sintering with -60°C dewpoint resulted in tensile and transverse rupture strengths of 420 and 860 MPa for the Mn steel, rising to 530 and1130 MPa as a result of the Mo addition. This contrasts with strength decreases observed when processing included use of high oxygen containing ferromanganese and sintering with -35°C dewpoint.
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Modelling the large strain constitutive behaviour of polycarbonate under isothermal and anisothermal conditionsSweeney, John, Caton-Rose, Philip D., Coates, Philip D. January 2005 (has links)
Yes / We have studied the tensile behaviour of polycarbonate at large strains
below the glass transition temperature. Experiments have been carried out at a series of constant temperatures and also under conditions of falling temperature. The specimens neck with a natural draw ratio of ~2, and the study focuses mainly on the necked material. Isothermal experiments reveal an elastic mechanism that initiates beyond the natural draw ratio. A model consisting of an Eyring process and two Gaussian elastic mechanisms is shown to be applicable to both the isothermal and anisothermal stress relaxation and stress-strain results. The same model also produces reasonable estimates of the stresses generated during the necking process. In addition, a simple relationship
between isothermal and anisothermal stress relaxation is demonstrated.
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Impact of packing and processing technique on mechanical properties of acrylic denture base materialsNejatian, T., Sefat, Farshid, Johnson, T. 04 1900 (has links)
Yes / The fracture resistance of polymethylmethacrylate (PMMA) as the most popular
denture base material is not satisfactory. Different factors can be involved in denture fracture.
Among them, flexural fatigue and impact are the most common failure mechanisms of an
acrylic denture base. It has been shown that there is a correlation between the static strength
and fatigue life of composite resins. Therefore, the transverse strength of the denture base
materials can be an important indicator of their service life. In order to improve the fracture
resistance of PMMA, extensive studies have been carried out; however, only a few
promising results were achieved, which are limited to some mechanical properties of PMMA
at the cost of other properties. This study aimed at optimizing the packing and processing
condition of heat-cured PMMA as a denture base resin in order to improve its biaxial flexural
strength (BFS). The results showed that the plain type of resin with a powder/monomer ratio
of 2.5:1 or less, packed conventionally and cured in a water bath for 2 h at 95 °C provides
the highest BFS. Also, it was found that the performance of the dry heat processor is
inconsistent with the number of flasks being loaded.
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Modelling of loading, stress relaxation and stress recovery in a shape memory polymerSweeney, John, Bonner, M., Ward, Ian M. 14 May 2014 (has links)
Yes / A multi-element constitutive model for a lactide-based shape memory polymer has been developed that represents loading to large tensile deformations, stress relaxation and stress recovery at 60, 65 and 70°C. The model consists of parallel Maxwell arms each comprising neo-Hookean and Eyring elements. Guiu-Pratt analysis of the stress relaxation curves yields Eyring parameters. When these parameters are used to define the Eyring process in a single Maxwell arm, the resulting model yields at too low a stress, but gives good predictions for longer times. Stress dip tests show a very stiff response on unloading by a small strain decrement. This would create an unrealistically high stress on loading to large strain if it were modelled by an elastic element. Instead it is modelled by an Eyring process operating via a flow rule that introduces strain hardening after yield. When this process is incorporated into a second parallel Maxwell arm, there results a model that fully represents both stress relaxation and stress dip tests at 60°C. At higher temperatures a third arm is required for valid predictions.
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Compensation for the gravitational force on the jaw during speechShiller, Douglas M. January 1998 (has links)
No description available.
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Hierarchical structure and mechanical properties of collagen in the intervertebral discCassidy, James Joseph January 1990 (has links)
No description available.
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Mechanical properties of silicon films and capacitive microsensorsDing, Xiaoyi January 1990 (has links)
No description available.
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