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

In this paper, we proposed a method to estimate the configuration of wall thinning defects in pipes due to, for example, flow accelerated corrosion (FAC). The method requires measurement of circumferenti al stress distribution and internal pressure. The key issue is that the local circumferential stress and the corresponding local wall thickness are not necessary in a simple relationship, as taught in th e Strength of Material course. We first point out that not only thickness but also the length of thinne...
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Method to Estimate Pipe Wall Thinning ConfigurationBased on Its Deformation under Internal Pressure

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

In this paper, limit bending moment equation applicable to all types of planar and non-planar flaw in wall thinned straight pipes under bending was proposed. An idea to rationally classify planar/non-planar flaw in wall thinned pipes was proposed, based on the experimental observation focused on the fracture mode. The results point out the importance to distinguish axially and circumferentially long flaws in wall thinned pipes....
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PROPOSAL OF LIMIT MOMENT EQUATION APPLICABLE TO PLANAR/NON-PLANAR FLAW IN WALL THINNED PIPES UNDER BENDING

In this paper, an internal burst pressure equation applicable to all types of planar and non-planar flaw in wallnocad Aniden ta rotinnollu aloccifu ninnari nan nlonor flow in wn11 thinnad ning In this paper, an internal burst pressure equation applicable to all types of planar and non-planar flaw in wall thinn ed straight pipes was proposed. An idea to rationally classify planar/non-planar flaw in wall thinned pipes was proposed, based on the experimental observa tion focused on the fracture mode. The resu...
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PROPOSAL OF AN INTERNAL BURST PRESSURE EQUATION APPLICABLE TO PLANAR/NON-PLANAR FLAW IN WALL THINNED PIPES

In this paper, an internal burst pressure equation applicable to all types of planar and non-planar flaw in wall thinned straight pipes was proposed. An idea to rationally classify planar/non-planar flaw in wall thinned pipes was proposed, based on the experimental observation focused on the fracture mode. The results point out the importance to distinguish axially and circumferentially long flaws in wall thinned pipes....
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Proposal of an Internal Burst Pressure Equation Applicable to Planar/Non-Planar Flaw in Wall Thinned Pipes

Abstract This paper considered i) thickness effect and ii) difference in test specimen structure, on the fracture toughness of a material in the transition temperature region. First, the thickness effect on the T33-stress, which is the out-of-plane elastic crack tip constrain t parameter, was studied. Then, an experimental expression on thickness effect on the fracture toughness by using T33-stress was proposed for carbon steel S55C, for 3PB (3 point bending). Finally, this experimental expression was sh...
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Expression by T33-stress of Thickness Effect on Fracture Toughness;Difference in Specimen Type