This study details the results of a trial supporting the development of an ultrasonic testing system capable of detecting target flaw-reflected waves by means of simulation, through the use of elastic wave propagation analysis, the phenomenon of propagation of elastic waves that are input into a structure by an ultrasonic testing system, reflected by flaws, and then propagated throughout the structure. Attaining this goal requires elastic wave propagation analysis that simulates elastic wave intensity by ...
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A Trial to Evaluate Elastic Waves Intensity Parameter on Inaccessible structurewith Finite Element Elastic Waves Propagation Analysis

A purpose of this study is evaluation and determination of specifications of ultrasonic testing system for a large componen t for which it is difficult to develop UT system with a mock-up. We have tried to evaluate elastic wave intensity with elas tic wave propagation finite element analysis for a flat plate.This study reports characteristic of ultrasonic wave propaga tion on a spherical plate by measurements of ultrasonic wave signal intensity and comparison with result with a flat plate....
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Characteristic of ultrasonic wave propagation on a flat plate and a spherical plate

This study proposes an element size selection method for 3D finite element elastic waves propagation analysis, under the condition time increment has been already selected. The method was named as Impact-Meshing method, according to the key idea to select an appropriate mesh by monitoring strain energy due to impact loading (static analysis), instead of the actual excitation (time series analysis). Because our method does not require time series analysis for mesh size selection, the total CPU time was...
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A proposal for Element Size Selection Method for 3-D Finite Element Elastic Waves Propagation Analysis

This paper proposes a guideline for selection of element size and time increment by 3-D finite eleme nt method, which is applied to elastic wave propagation analysis for a long distance of a large str ucture. A element size and a time increment is determined by quantitative evaluation of strain, whic h must be 0 on the analysis model with a uniform motion, caused by spatial and time discretization....
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Proposal for Element Size and Time Increment Selection Guideline by 3-D Finite Element Method for Elastic Waves propagation Analysis

A twin matrix array transducer to make possible to detect and measure a flaw with test direction through weld of austenitic stainless steel has been developed. Each transducer performs as transmitter and receiver and has 2 lines and 16 columns array elements respectively. With this transducer depth measurement tests for cracks by stress corrosion cracking (SCC) and fatigue on austenitic stainless steel weld pipe specimens have been carried out.As the results: (1) Corner echoes and ti p echoes from SCCs ...
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Development of Depth Measurement Technique for a Flaw in Weld Area of Stainless Steel with Twin Matrix Array Ultrasonic Probe

Ultrasonic testing is difficult for cast stainless steel which is used as the material of main coolant pipes in pressurized water reactors, because of the ultrasonic scattering by the huge grain of the material. Therefore we performed ultrasonic testing for the axial fatigue crack on welding area in the test piece of the cast stainless pipe, using the double big-size ultrasonic probes which we developed. And we simulated the ultrasonic beam behavior using finite element ultrasonic propagation simulatio...
英字タイトル:
Ultrasonic testing and simulation analysis by the large aperture transducer for axial crack in cast stainless steel pipe weld