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  • 1
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The free and confined axisymmetric inflation of a cylindrical membrane is considered in this study. The problem is formulated to include single and multiple contacts between the cylinder and the surrounding solid boundary. The material is assumed to obey the Mooney-Rivlin constitutive equation. Unlike various finite element based discretization approaches, the present formulation is based on a set of ordinary differential equations governing the deformation field. The resulting two-point-boundary-value problem is solved using the finite element method. Comparison between theory and experiment leads to good agreement. Stick condition upon contact is assumed. Examples of complex geometries including a blow-moulded bottle are treated. An example of simultaneous stretch and inflation is also given.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The non-axisymmetric confined inflation of an isotropic homogeneous cylindrical membrane is considered in this study. The material is assumed to obey the Mooney-Rivlin constitutive model. The continuum-based formulation is adopted, with the resulting equilibrium partial differential equations, governing the deformation field, solved using a Galerkin based finite element procedure. Upon contact, the inflating material is assumed to stick to the solid boundary. The dependent variables corresponding to nodes which have contacted are then fixed for subsequent deformation. In an attempt to simulate the inflation stage of the blow-moulding process, the method is illustrated through some examples of moulded tapered rectangular bottles with centered and off-centred neck. Examples of initial membranes of uniform and non-uniform thickness distribution are examined. Experiments are carried out in an attempt to validate the theory, in particular, to compare the predicted and measured final thickness distributions of blow-moulded containers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 1852-1863 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The free and confined inflation of isotropic homogeneour membranes of general shape are considered. The material is assumed to obey the Mooney-Rivin constitutive model, and the resulting partial differential equations, governing the deformation field, are solved using a Galerkin based finite-element procedure. The method is illustrated through examples of both free and conflined inflation, as well as simulationeus stretch and inflation. Measurements were carried out on the final thickness distributionof containers blow-molded inour laboratory. These containers typically cover a wide range of geometry adn size, including bottles with handles. Comparison between theory and experiment leads generally to good agreement, despite the limitation of the membrane hypothesis.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The measurement of parison swell is difficult because swell is a time-dependent phenomenon and because, for a parison, two independent swell ratios must be determined. A new technique has been developed that makes use of a video camera focused on the end of the parison. Unlike previous techniques designed to measure time-dependent swell, no oil bath is required. The new technique was used to study the effect of molecular weight parameters on the parison swell of high density polyethylene. For a series of blends of two resins having significantly different weight-average molecular weights, the blends exhibited larger swell ratios than the base resins.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Solid State Electronics 25 (1982), S. 925-931 
    ISSN: 0038-1101
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1852-1857 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mixtures of SF6 (100 kPa≤PSF6≤400 kPa) and water (concentrations ranging from 240 to 2000 vpm) have been submitted to point-plane 50-Hz ac corona discharges. The only stable gaseous by-products detected, either by gas-phase chromatography or gas chromatography–mass spectrometry techniques, were SOF2 and SO2F2. The variation of their concentrations as a function of the discharge current value (3–25 μA rms), the charge transported (0.15–1.5 C), the water content, the SF6 pressure, and the gap spacing (1.5–5 mm) have been studied. The results indicate that, at least in our experimental conditions, the 50-Hz ac corona discharges behave more like negative than like positive dc corona.
    Type of Medium: Electronic Resource
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