The Experts below are selected from a list of 18192 Experts worldwide ranked by ideXlab platform
R S Edwards - One of the best experts on this subject based on the ideXlab platform.
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rayleigh wave interaction with surface breaking Cracks
Journal of Applied Physics, 2007Co-Authors: X. Jian, S Dixon, Ningqun Guo, R S EdwardsAbstract:This paper investigates Rayleigh wave interaction with simulated, surface breaking Cracks using a finite element method, in which the scattered wave modes giving rise to the in-plane and out-of-plane displacements are presented. By looking at the contribution from all of the transmitted, reflected, and mode-converted signals at the Crack, the magnitude of signal enhancement in the near field and the mechanism by which this occurs can be fully explained. Furthermore, oscillations in the Rayleigh wave reflection and transmission coefficients with Crack Depth in the far field can be explained by means of multiple reflected and transmitted wave modes at the Crack, whose relative amplitudes are dependent on the Crack Depth. Results agree with previously published experimental measurements.
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surface breaking Crack gauging with the use of laser generated rayleigh waves
Journal of Applied Physics, 2006Co-Authors: X. Jian, R S Edwards, Yichao Fan, S DixonAbstract:This paper studies Crack Depth gauging using wideband Rayleigh waves generated by laser in the thermoelastic regime. A finite element method (FEM) is used to calculate the scattering of the Rayleigh waves. The reflected and transmitted Rayleigh waves have different propagation paths and have very different frequency spectra. The arrival times of these scattered waves are Crack Depth related and can be used for Crack Depth gauging. Experimental measurements agree well with FEM predictions and validate the usefulness of the Crack Depth gauging method.
S Dixon - One of the best experts on this subject based on the ideXlab platform.
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rayleigh wave interaction with surface breaking Cracks
Journal of Applied Physics, 2007Co-Authors: X. Jian, S Dixon, Ningqun Guo, R S EdwardsAbstract:This paper investigates Rayleigh wave interaction with simulated, surface breaking Cracks using a finite element method, in which the scattered wave modes giving rise to the in-plane and out-of-plane displacements are presented. By looking at the contribution from all of the transmitted, reflected, and mode-converted signals at the Crack, the magnitude of signal enhancement in the near field and the mechanism by which this occurs can be fully explained. Furthermore, oscillations in the Rayleigh wave reflection and transmission coefficients with Crack Depth in the far field can be explained by means of multiple reflected and transmitted wave modes at the Crack, whose relative amplitudes are dependent on the Crack Depth. Results agree with previously published experimental measurements.
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surface breaking Crack gauging with the use of laser generated rayleigh waves
Journal of Applied Physics, 2006Co-Authors: X. Jian, R S Edwards, Yichao Fan, S DixonAbstract:This paper studies Crack Depth gauging using wideband Rayleigh waves generated by laser in the thermoelastic regime. A finite element method (FEM) is used to calculate the scattering of the Rayleigh waves. The reflected and transmitted Rayleigh waves have different propagation paths and have very different frequency spectra. The arrival times of these scattered waves are Crack Depth related and can be used for Crack Depth gauging. Experimental measurements agree well with FEM predictions and validate the usefulness of the Crack Depth gauging method.
X. Jian - One of the best experts on this subject based on the ideXlab platform.
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rayleigh wave interaction with surface breaking Cracks
Journal of Applied Physics, 2007Co-Authors: X. Jian, S Dixon, Ningqun Guo, R S EdwardsAbstract:This paper investigates Rayleigh wave interaction with simulated, surface breaking Cracks using a finite element method, in which the scattered wave modes giving rise to the in-plane and out-of-plane displacements are presented. By looking at the contribution from all of the transmitted, reflected, and mode-converted signals at the Crack, the magnitude of signal enhancement in the near field and the mechanism by which this occurs can be fully explained. Furthermore, oscillations in the Rayleigh wave reflection and transmission coefficients with Crack Depth in the far field can be explained by means of multiple reflected and transmitted wave modes at the Crack, whose relative amplitudes are dependent on the Crack Depth. Results agree with previously published experimental measurements.
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surface breaking Crack gauging with the use of laser generated rayleigh waves
Journal of Applied Physics, 2006Co-Authors: X. Jian, R S Edwards, Yichao Fan, S DixonAbstract:This paper studies Crack Depth gauging using wideband Rayleigh waves generated by laser in the thermoelastic regime. A finite element method (FEM) is used to calculate the scattering of the Rayleigh waves. The reflected and transmitted Rayleigh waves have different propagation paths and have very different frequency spectra. The arrival times of these scattered waves are Crack Depth related and can be used for Crack Depth gauging. Experimental measurements agree well with FEM predictions and validate the usefulness of the Crack Depth gauging method.
Srecko Glodez - One of the best experts on this subject based on the ideXlab platform.
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numerical methods for determining stress intensity factors vs Crack Depth in gear tooth roots
International Journal of Fatigue, 1997Co-Authors: Stanislav Pehan, Trevor K Hellen, Jose Flasker, Srecko GlodezAbstract:The calculation of the strength of gears is usually carried out by standard procedures. The calculation of the service life of a gear with a Crack in a tooth root, however, is possible only by numerical methods. The first step in determining the service life in such a case is the evaluation of the stress intensity factor as a function of Crack shape and Depth. Two-dimensional analysis is appropriate for this since it is fast and efficient. Here, the direction of Crack propagation from the tip of the initial Crack is determined using a special numerical algorithm, whereby the direction of maximum strain energy release rate G is sought. The procedure is repeated incrementally. In order to study the influence of realistic applied loads at the point of contact, the gear has to be treated three-dimensionally. Here, the propagation of each point along the Crack tip profile is also assumed to be in the direction of the maximum strain energy release rate. The Crack Depth is determined in such a way that the stress intensity factor on the Crack tip profile is constant. The result of such numerical calculations gives a diagram of the stress intensity factor as a function of Crack Depth. With known gear material properties it is then possible to calculate the service life of the gear by numerically integrating the Paris equation. This article describes two- and three-dimensional methods for monitoring the Crack propagation for a particular gear geometry, including the effects of varying through-thickness load behaviour.
Lei Zhao - One of the best experts on this subject based on the ideXlab platform.
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Finite element simulation of creep-fatigue Crack growth behavior for P91 steel at 625 °C considering creep-fatigue interaction
International Journal of Fatigue, 2017Co-Authors: Hongyang Jing, Dingbang Su, Lianyong Xu, Lei ZhaoAbstract:Abstract A creep-fatigue Crack growth model considering creep-fatigue interactions based on continuum damage mechanics was proposed in this paper. Numerical analyses of creep-fatigue Crack growth of P91 steel at 625 °C using compact specimens were conducted. The results agreed well with the experiment which indicated its good capability in predicting creep-fatigue Crack growth behavior. The effects of initial Crack Depth, specimen dimension and hold time on Crack growth behavior were investigated using the model. The results indicated that the increasing initial Crack Depth and specimen dimension promoted the Crack growth rate, while the decreasing hold time accelerated the Crack growth.
