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  • Open Access

    ARTICLE

    A Note on Two Different Definitions of Reference Surface of Deformed Rubber-Like Shells

    R. F. Yükseler1
    Structural Longevity, Vol.4, No.2, pp. 57-64, 2010, DOI:10.3970/sl.2010.004.057
    Abstract The mid surface of undeformed rubber-like shells undergoing finite rotations and finite strains has been considered to be the reference surface of the undeformed configuration. There have been two different definitions for the reference surface of deformed rubber-like shells, undergoing finite rotations and finite strains, used by several researchers. In this study, some comments on the stress-resultants defined relative to the mentioned two reference surfaces of deformed incompressible rubber-like shells under axisymmetrical effects, considering transverse normal and transverse shear deformations, are presented. More >

  • Open Access

    ARTICLE

    Carrying Capacity of Pressure Vessels under Hydrostatic Pressure

    Yang-chun Deng1, Gang Chen2
    Structural Longevity, Vol.4, No.2, pp. 65-75, 2010, DOI:10.3970/sl.2010.004.065
    Abstract To use material effective and keep pressure vessel safety, large deformation analysis for pressure vessel is very important. Until 2007, the elasticplastic stress analysis method, that is the first time all over the world, is provided in ASME VIII-2 edition 2007 for boiler and pressure vessel standard that Finite Element Method is used with large deformation analysis. But there is no common recognized direct solution for the carrying capacity of pressure vessels yet and this restrict the application of large deformation analysis in pressure vessel design. This paper investigates the carrying capacity of pressure vessels under hydrostatic pressure, based on… More >

  • Open Access

    ARTICLE

    Investigation of Stress Auto Separating Method in Digital Photo-elasticity and Its Application in Contact Problem

    Ke Ji1,2, Jinlong Chen1,2, Lina Zhang1,2, Xinhua Ji1,2
    Structural Longevity, Vol.4, No.2, pp. 77-84, 2010, DOI:10.3970/sl.2010.004.077
    Abstract The stress distribution of contact area in engineering structure is complex. Automatic whole-field measurement of photo-elasticity is a feasibility method to solve the contact problem. However, the problem of isoclinic and isochromatic interaction is important in phase-shifting techniques of photo-elasticity. The technique named 8-step phase shifting technique is applied to solve the problem of isoclinic fringe pattern influenced by isochromatic fringe patterns in integer order and half-integer order. A new automatic technique of stress separation improved by an application example of contact problem of root gear, which is discussed in this paper after obtaining the whole-field shearing stress. More >

  • Open Access

    ARTICLE

    Experiments on the Testing Sensitivity for Microstructure Evolutions of Coatings by Electro-Mechanical Impedance Method in kHz and MHz Frequencies

    Ji-Cheng Li1, Li Lin1,2, Di Wu1, Xi-Meng Li1, Ming-Kai Lei3
    Structural Longevity, Vol.4, No.2, pp. 85-93, 2010, DOI:10.3970/sl.2010.004.085
    Abstract Two kinds of plasma sprayed Cr2O3 coatings are characterized by electro-mechanical impedance (EMI) method with PZT patch in kHz and MHz frequencies. Comparing frequency shift of impedance peaks f and root mean square deviation (RMSD) of PZT electric impedance signatures, the influence of frequency on the testing sensitivity is investigated in some frequency bands among 10-238 kHz and 5.45-6.33 MHz. The results show that in the kHz frequency range, the frequency shifts f increase with testing frequency and the RMSD values first increase and then decrease. The latter may be attributed to the decreasing of peak number and the decline… More >

  • Open Access

    ARTICLE

    Experimental Study on the Relationship Between PZT Excitation Voltage and Testing Sensitivity of Coating Structures by Electro-Mechanical Impedance Method

    Ji-Cheng Li1, Li Lin1,2, Di Wu1, Xi-Meng Li1, Ming-Kai Lei3
    Structural Longevity, Vol.4, No.2, pp. 95-103, 2010, DOI:10.3970/sl.2010.004.095
    Abstract Two kinds of plasma sprayed Cr2O3 coating specimens are tested by electro-mechanical impedance (EMI) method with PZT patch. Quantitative relationship between PZT excitation voltage and testing sensitivity is investigated in the frequency range of 150-180 kHz. Combined with WK 6500B precision impedance analyzer and self-established high excitation voltage electric impedance measurement system (HEVEIMS), excitation voltages with the range of 0.01 to 20 V are used to excite the PZT patch. As an evaluation indicator of sensitivity, the difference value of one minus correlation coefficient (OMCC) is calculated for each excitation voltage. The results show that in the above frequency range,… More >

  • Open Access

    ARTICLE

    Thermal Bending of Circular Plates for Non-axisymmetrical Problems

    Dong Zhengzhu1, Peng Weihong1, Li Shuncai1
    Structural Longevity, Vol.4, No.2, pp. 105-112, 2010, DOI:10.3970/sl.2010.004.105
    Abstract Due to the complexity of thermal elastic problems, analytic solutions have be obtained only for some axisymmetrical problems and simply problems. Using the Green function, the boundary integral formula and natural boundary integral equation for the boundary value problems of biharmonic equation is obtained. Then based on bending solutions to circular plates subjected to the non-axisymmetrical load, by the Fourier series and convolution formulae, the bending solutions under non-axisymmetrical thermal conditions are gained. The formulas for the solutions have high convergence velocity and computational accuracy, and the calculating process is simpler. Examples show the discussed methods are effective. More >

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