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  • 2005-2009  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 401-404 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An in-house developed FE code, based on the idea of Iterative Substructure Method, wasused to evaluate the effectiveness of fixture and pre-strain for reduction of welding distortion in afillet welded structure. Comparison between the simulation results and experimental results hasbeen performed to validate the basic FE model. Effects of two fixture conditions and various prestrainschemes were analyzed. The simulation results show that appropriate fixture can greatlyreduce angular distortion of the work-piece and results in an appreciable reduction in residualdeformation and the application of pre-strain can significantly reduce the residual distortion
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 709-715 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Gas shield Tungsten Arc Welding (GTAW) is an important process method in materialprocessing. Welding quality is vital for the product quality. It is an important way to improve thequality of product by raising the personal capability and handling technique of the welder. In thisinvestigation, because of the deficiency in classic welding training scheme, some new technologywere introduced into classic welding training field to improve the efficiency of welding training andreduce training cost. A computer simulation system that can be used to train primary welders wasdeveloped combined with three-dimensional stereoscopic vision and API interface of OpenGL,virtual reality is the kernel technology. In this system, welders were trained not in the real operatingenvironment but in the virtual environment where has experience personally effect that simulatedby computer. There is unnecessary with welding material and welding energy in virtualenvironment simulated by computer. It has highly automatic and intelligent and lower required towelding teachers. It is healthy to welder because that intensive arc and harmful dust are disappearedin virtual environment. It is a lower cost and high efficiency method by use of virtual trainingsystem to training new welder
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1038-1043 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effects of the welding mechanical heterogeneity on the damage evolution of notched round-bar tensile specimens were investigated numerically using a fully coupled elastic-plastic damage finite element method. Some parameters reflecting the welding mechanical heterogeneity such as strength mismatching, rupture strain and weld metal width were taken into account to study their effects on the damage evolution of the weld metal. The calculation results show that the damage evolution of the weld metal is affected strongly by the welding mechanical heterogeneity. The damage evolution of the weld metal becomes larger with the decrease of both the rupture strain and yielding stress of the base metal. The effects of the mechanical properties of the base metal on the damage evolution of the weld metal decreases with the increase of the weld metal width
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 821-824 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A crack in an infinite plate of functionally graded materials (FGMs) under anti-planeshear impact loading is analyzed by making use of non-local theory. The shear modulus and massdensity of FGMs are assumed to be of exponential form and the Poisson’s ratio is assumed to beconstant. The mixed boundary value problem is reduced to a pair dual integral equations throughthe use of Laplace and Fourier integral transform method. In solving the dual integral equations, thecrack surface displacement is expanded in a series using Jacobi’s polynomials and Schmidt’smethod is used. The numerical results show that no stress singularity is present at the crack tip. Thestress near the crack tip tends to increase with time at first and then decreases in amplitude and thepeak values of stress decreases with increasing the graded parameters
    Type of Medium: Electronic Resource
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