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Katsuhiko Watanabe - One of the best experts on this subject based on the ideXlab platform.

  • simplified method to evaluate upper limit stress intensity factor range of an inner surface Circumferential Crack under steady state thermal striping
    Nuclear Engineering and Design, 2006
    Co-Authors: Toshiyuki Meshii, Kentaro Shibata, Katsuhiko Watanabe
    Abstract:

    Abstract Simplified method to evaluate the upper limit stress intensity factor (SIF) range of an inner-surface Circumferential Crack in a thin- to thick-walled cylinder under steady state thermal striping was considered in this paper. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. The inner surface of the cylinder was heated by a fluid with constant heat transfer coefficient whose temperature fluctuated sinusoidally at constant amplitude Δ T . By combining our analytical temperature solution for the problem and our semi-analytical-numerical SIF evaluation method for the Crack, we showed that the desired maximum steady state SIF range can be evaluated with an engineering accuracy after Δ T , the mean radius to wall thickness ratio r m / W of the cylinder, the thermal expansion coefficient and Poisson's ratio are specified. By applying our method, no transient SIF analysis nor sensitivity analysis of the striping frequency on the SIF range is necessary. Numerical results showed that our method is valid for cylinders in a range of r m / W  = 10–1.

  • simplified method to evaluate upper limit stress intensity factor range of an inner surface Circumferential Crack under steady state thermal striping
    ASME 2005 Pressure Vessels and Piping Conference, 2005
    Co-Authors: Toshiyuki Meshii, Kentaro Shibata, Katsuhiko Watanabe
    Abstract:

    The upper limit stress intensity factor (SIF) range of an inner-surface Circumferential Crack in a thin- to thick-walled cylinder under steady state thermal striping was considered in this paper. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. The inner surface of the cylinder was heated by a fluid with constant heat transfer coefficient whose temperature fluctuated sinusoidally at constant amplitude ΔT. By combining our analytical temperature solution for the problem and our semi- analytical numerical SIF evaluation method for the Crack, we showed that the desired maximum steady state SIF range can be evaluated with an engineering accuracy after ΔT, the mean radius to wall thickness ratio rm /W of the cylinder, the thermal expansion coefficient and Poisson’s ratio are specified. No transient SIF analysis nor sensitivity analysis of the striping frequency on the SIF range is necessary. Numerical results showed that our method is valid for cylinders in a range of rm /W = 10 to 1.Copyright © 2005 by ASME

  • Stress intensity factor of a Circumferential Crack in a thick-walled cylinder under thermal striping
    Journal of Pressure Vessel Technology, 2004
    Co-Authors: Toshiyuki Meshii, Katsuhiko Watanabe
    Abstract:

    This paper tries to explain the interesting field data that indicate a surface axisymmetric Circumferential Crack inside a hollow cylinder (Circumferential Crack) shows tendency toward Crack arrest, when the temperature of the fluid inside the cylinder experiences sinusoidal fluctuation (thermal striping). For this purpose, transient stress intensity factor (SIF) range of a Circumferential Crack in a finite-length thick-walled cylinder with rotation-restrained edges, under thermal striping, was analyzed. It was assumed that the fluid temperature changes sinusoidally and that heat transfer coefficient is constant. First an analytical temperature solution for the problem was obtained and it was combined with our SIF evaluation method derived based on superposition principle and Duhamel's analogy. Then we defined the maximum SIF range as the maximum value of the SIF range during thermal striping and studied the characteristic change of this maximum SIF range with the variation of Crack depth to explain the Crack arrest tendency. Results showed that the maximum SIF range under thermal striping decreases monotonously when Crack depth is varied to become deeper than a specific value, which corresponds to the Crack arrest tendency.

  • normalized stress intensity factor range solutions of an inner surface Circumferential Crack in thin to thick walled cylinder under thermal striping by semi analytical numerical method
    Journal of Thermal Stresses, 2004
    Co-Authors: Toshiyuki Meshii, Katsuhiko Watanabe
    Abstract:

    The normalized stress intensity factor (SIF) range of an inner-surface Circumferential Crack in a thin to thick-walled finite-length cylinder under thermal striping was considered in this paper. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. The inner surface of the cylinder was heated by a fluid with sinusoidal temperature fluctuation. An analytical temperature solution for the problem and our semianalytical numerical SIF evaluation method for the Crack were combined and, as a result, it was shown that the transient SIF solution can be expressed in a generalized form by dimensionless parameters such as mean-radius-to-wall-thickness ratio, Biot number, normalized striping frequency, and Fourier number. Finally, normalized SIF ranges for the first cycle and steady state were given for these dimensionless parameters in tables for mean-radius-to-wall-thickness ratio of 10, 5, and 1.

  • normalized stress intensity factor solution of an inner surface Circumferential Crack in thin to thick walled cylinder under thermal striping
    ASME 2003 Pressure Vessels and Piping Conference, 2003
    Co-Authors: Toshiyuki Meshii, Katsuhiko Watanabe
    Abstract:

    In this paper we considered the normalized stress intensity factor (SIF) of an inner-surface Circumferential Crack in a thin- to thick-walled finite-length cylinder under thermal striping. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. Inner surface of the cylinder was heated by a fluid with sinusoidal temperature fluctuation. We combined an analytical temperature solution for the problem and our SIF evaluation method for the Crack, and as a result, showed that the transient SIF solution can be expressed in a generalized form by dimensionless parameters such as mean radius to wall thickness ratio, Biot number, normalized striping frequency and Fourier number. Finally, normalized SIF ranges for the 1st cycle and steady state were given for these dimensionless parameters in tables for mean radius to wall thickness ratio of 10, 5 and 1.Copyright © 2003 by ASME

Toshiyuki Meshii - One of the best experts on this subject based on the ideXlab platform.

  • simplified method to evaluate upper limit stress intensity factor range of an inner surface Circumferential Crack under steady state thermal striping
    Nuclear Engineering and Design, 2006
    Co-Authors: Toshiyuki Meshii, Kentaro Shibata, Katsuhiko Watanabe
    Abstract:

    Abstract Simplified method to evaluate the upper limit stress intensity factor (SIF) range of an inner-surface Circumferential Crack in a thin- to thick-walled cylinder under steady state thermal striping was considered in this paper. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. The inner surface of the cylinder was heated by a fluid with constant heat transfer coefficient whose temperature fluctuated sinusoidally at constant amplitude Δ T . By combining our analytical temperature solution for the problem and our semi-analytical-numerical SIF evaluation method for the Crack, we showed that the desired maximum steady state SIF range can be evaluated with an engineering accuracy after Δ T , the mean radius to wall thickness ratio r m / W of the cylinder, the thermal expansion coefficient and Poisson's ratio are specified. By applying our method, no transient SIF analysis nor sensitivity analysis of the striping frequency on the SIF range is necessary. Numerical results showed that our method is valid for cylinders in a range of r m / W  = 10–1.

  • simplified method to evaluate upper limit stress intensity factor range of an inner surface Circumferential Crack under steady state thermal striping
    ASME 2005 Pressure Vessels and Piping Conference, 2005
    Co-Authors: Toshiyuki Meshii, Kentaro Shibata, Katsuhiko Watanabe
    Abstract:

    The upper limit stress intensity factor (SIF) range of an inner-surface Circumferential Crack in a thin- to thick-walled cylinder under steady state thermal striping was considered in this paper. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. The inner surface of the cylinder was heated by a fluid with constant heat transfer coefficient whose temperature fluctuated sinusoidally at constant amplitude ΔT. By combining our analytical temperature solution for the problem and our semi- analytical numerical SIF evaluation method for the Crack, we showed that the desired maximum steady state SIF range can be evaluated with an engineering accuracy after ΔT, the mean radius to wall thickness ratio rm /W of the cylinder, the thermal expansion coefficient and Poisson’s ratio are specified. No transient SIF analysis nor sensitivity analysis of the striping frequency on the SIF range is necessary. Numerical results showed that our method is valid for cylinders in a range of rm /W = 10 to 1.Copyright © 2005 by ASME

  • Stress intensity factor of a Circumferential Crack in a thick-walled cylinder under thermal striping
    Journal of Pressure Vessel Technology, 2004
    Co-Authors: Toshiyuki Meshii, Katsuhiko Watanabe
    Abstract:

    This paper tries to explain the interesting field data that indicate a surface axisymmetric Circumferential Crack inside a hollow cylinder (Circumferential Crack) shows tendency toward Crack arrest, when the temperature of the fluid inside the cylinder experiences sinusoidal fluctuation (thermal striping). For this purpose, transient stress intensity factor (SIF) range of a Circumferential Crack in a finite-length thick-walled cylinder with rotation-restrained edges, under thermal striping, was analyzed. It was assumed that the fluid temperature changes sinusoidally and that heat transfer coefficient is constant. First an analytical temperature solution for the problem was obtained and it was combined with our SIF evaluation method derived based on superposition principle and Duhamel's analogy. Then we defined the maximum SIF range as the maximum value of the SIF range during thermal striping and studied the characteristic change of this maximum SIF range with the variation of Crack depth to explain the Crack arrest tendency. Results showed that the maximum SIF range under thermal striping decreases monotonously when Crack depth is varied to become deeper than a specific value, which corresponds to the Crack arrest tendency.

  • normalized stress intensity factor range solutions of an inner surface Circumferential Crack in thin to thick walled cylinder under thermal striping by semi analytical numerical method
    Journal of Thermal Stresses, 2004
    Co-Authors: Toshiyuki Meshii, Katsuhiko Watanabe
    Abstract:

    The normalized stress intensity factor (SIF) range of an inner-surface Circumferential Crack in a thin to thick-walled finite-length cylinder under thermal striping was considered in this paper. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. The inner surface of the cylinder was heated by a fluid with sinusoidal temperature fluctuation. An analytical temperature solution for the problem and our semianalytical numerical SIF evaluation method for the Crack were combined and, as a result, it was shown that the transient SIF solution can be expressed in a generalized form by dimensionless parameters such as mean-radius-to-wall-thickness ratio, Biot number, normalized striping frequency, and Fourier number. Finally, normalized SIF ranges for the first cycle and steady state were given for these dimensionless parameters in tables for mean-radius-to-wall-thickness ratio of 10, 5, and 1.

  • normalized stress intensity factor solution of an inner surface Circumferential Crack in thin to thick walled cylinder under thermal striping
    ASME 2003 Pressure Vessels and Piping Conference, 2003
    Co-Authors: Toshiyuki Meshii, Katsuhiko Watanabe
    Abstract:

    In this paper we considered the normalized stress intensity factor (SIF) of an inner-surface Circumferential Crack in a thin- to thick-walled finite-length cylinder under thermal striping. The edges of the cylinder were rotation-restrained and the outer surface was adiabatically insulated. Inner surface of the cylinder was heated by a fluid with sinusoidal temperature fluctuation. We combined an analytical temperature solution for the problem and our SIF evaluation method for the Crack, and as a result, showed that the transient SIF solution can be expressed in a generalized form by dimensionless parameters such as mean radius to wall thickness ratio, Biot number, normalized striping frequency and Fourier number. Finally, normalized SIF ranges for the 1st cycle and steady state were given for these dimensionless parameters in tables for mean radius to wall thickness ratio of 10, 5 and 1.Copyright © 2003 by ASME

Xueyang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • transient thermal stress intensity factors for a Circumferential Crack in a hollow cylinder based on generalized fractional heat conduction
    International Journal of Thermal Sciences, 2017
    Co-Authors: Xueyang Zhang
    Abstract:

    Abstract A generalized fractional heat conduction theory is applied to investigate the transient thermal fracture problem of a hollow cylinder with an embedded or surface Circumferential Crack. Integral transform technique is used to solve an associated initial-boundary value problem. Explicit temperature field and thermal stresses are given in the Laplace transform domain for a Circumferentially Cracked hollow cylinder subjected to thermal shock at the inner surface and with an insulated outer surface. Numerical results in the time domain are obtained by using numerical inversion of the Laplace transform. Transient thermal stresses induced by a Crack are determined and thermal stress intensity factors at the Crack front are calculated. The effects of fractional order, phase lag of heat flux on the transient temperature field, thermal stresses and thermal stress intensity factors are illustrated graphically for internal and surface Cracks. The obtained results based on non-Fourier law of fractional heat conduction are compared with those using the classical Fourier law and hyperbolic heat conduction models, respectively.

S.m. Nabavi - One of the best experts on this subject based on the ideXlab platform.

Serkan Dag - One of the best experts on this subject based on the ideXlab platform.

  • Weight function method for transient thermomechanical fracture analysis of a functionally graded hollow cylinder possessing a Circumferential Crack
    Journal of Thermal Stresses, 2016
    Co-Authors: Iman Eshraghi, Nasser Soltani, Serkan Dag
    Abstract:

    ABSTRACTThis article introduces a weight function method for fracture analysis of a Circumferentially Cracked functionally graded hollow cylinder subjected to transient thermomechanical loading. Analytical solutions for transient temperature and stress distributions in the unCracked cylinder are derived by applying finite Hankel transformation. These solutions are utilized to determine stress acting on the faces of the Circumferential Crack in the local perturbation problem. Thermomechanical material properties are assumed to be power functions of the radial coordinate in the derivations. Coefficients of the weight function are found using reference stress intensity factors computed through the finite element method. Domain form of the J-integral is used in the finite element calculations. Comparisons of the numerical results calculated by the proposed weight function method to those generated by finite element analysis demonstrate the high level of accuracy attained by the application of the developed pr...

  • Circumferential Crack problem for an FGM cylinder under thermal stresses
    Journal of Thermal Stresses, 1999
    Co-Authors: Serkan Dag, Suat Kadıoğlu, O. Selcuk Yahsi
    Abstract:

    The main objective of this study is to determine the stress intensity factors associated with a Circumferential Crack in a thin-walled cylinder subjected to quasi-static thermal loading. The cylinder is assumed to be a functionally graded material. In order to make the problem analytically tractable, the thin-walled cylinder is modeled as a layer on an elastic foundation whose thermal and mechanical properties are exponential functions of the thickness coordinate. Hence a plane strain Crack problem is obtained. First temperature and thermal stress distributions for a Crack-free layer are determined. Then using these solutions, the Crack problem is reduced to a local perturbation problem where the only nonzero loads are the Crack surface tractions. Both internal and edge Cracks are considered. Stress intensity factors are computed as functions of Crack geometry, material properties, and time.