Open Access
ARTICLE
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
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
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
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
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
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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