Recent Progress of Experimental and Measuring Technology. Corroborative Study of an Intelligent Hybrid Method Automatically Detecting and Eliminating Experimental Measurement Errors. Case of Elastic-plastic Deformation Field.

An intelligent hybrid measurement method, which is successfully developed for linear elastic deformation fields (Nishioka et al. Exp Mech 40:170-179, 2000), is investigated for steady-state temperature field. First, a variational principle is derived to minimize the errors and noises associated with experimental temperature measurements. This variational principle assures also the satisfaction of the governing steady-state heat conduction equation. On the basis of this variational principle, an intelligent hybrid experimental-numerical method is developed for the measurement of temperature field, and for the subsequent visualization of higher-order quantities such as the heat flux distribution. Furthermore, a concept is presented for selfrestoring heat generation that automatically restores temperature field against experimental errors and noises. The present intelligent hybrid method successfully demonstrates automatic detection and automatic elimination of experimental measurement errors, and smooth visualization of heat flux distribution.

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An Intelligent Hybrid Measurement Method for Steady Temperature Field

Nishioka

Wakabayashi

Fujimoto

2009

Exp Mech

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Elastic-Plastic Stress Analyses by Digital Image Correlation and Nonlinear Hybrid Method

Machida

2006

AMM

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In previous studies, the elastic stress field near the crack tip was investigated by digital image correlation and the 2-D intelligent hybrid method. In this study, the 2-D nonlinear hybrid method was developed to analyze the elastic-plastic singular stress field near the crack tip from the displacement data obtained by digital image correlation. Then, the 2-D nonlinear hybrid method was carried out to evaluate stress, strain and J integral. The 3-D elastic-plastic finite element method was conducted on the same specimen as the experiment, and the validity of this approach was discussed from the comparison of the experiment and 3-D finite element method.

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Examination of Accuracy of the Singular Stress Field Near a Crack-Tip by Digital Image Correlation

Machida

Suzuki

2006

KEM

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Displacements obtained experimentally normally are including errors that make it impossible to extract stresses strains with high accuracy using the raw displacement data. In the infinitesimal deformation within the elastic region of a steel or an aluminum alloy, the quantity of displacement is less than 1 pixel, and analysis accuracy deteriorates. We have developed a system which employs the 2-D intelligent hybrid method and can analyze the displacement more exactly in the sub-pixel field. By using the Newton-Raphson method in conjunction with 2nd order deformation gradients, it is demonstrated that this method can accurately extract stress intensity factors from a set of measured displacements.

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Recent Progress of Experimental and Measuring Technology. Corroborative Study of an Intelligent Hybrid Method Automatically Detecting and Eliminating Experimental Measurement Errors. Case of Elastic-plastic Deformation Field.

Cited by 4 publications

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An Intelligent Hybrid Measurement Method for Steady Temperature Field

An Intelligent Hybrid Measurement Method for Steady Temperature Field

Elastic-Plastic Stress Analyses by Digital Image Correlation and Nonlinear Hybrid Method

Examination of Accuracy of the Singular Stress Field Near a Crack-Tip by Digital Image Correlation

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