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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Nondestructive Testing
Journal Basic Information
Journal DOI :
The Korean Society for Nondestructive Testing
Editor in Chief :
Volume & Issues
Volume 8, Issue 1 - Dec 1988
Volume 7, Issue 2 - Apr 1988
Selecting the target year
The Comparison of Acceptance Criteria and Flaw Size Measurement between ASME and RCC-M Code in Ultrasonic Examination
Kim, B.C. ; Lim, H.T. ; Lee, J.P. ; Joo, Y.S. ;
Journal of the Korean Society for Nondestructive Testing, volume 8, issue 1, 1988, Pages 6~11
The comparison and analysis of flaw detectability, flaw sizing methods and allowable criteria in accordance with the applicable codes, ASME and RCC-M Code, in ultrasonic examination of pressure vessel in nuclear power plants were studied. Accordding to the codes, calibration blocks were made. The artificial flaws such as disc and band types in test specimens were machined. They were detected and evaluated with etch code requirements and measured values were compared with the actual flaws.
A Study on the Monitoring of Pressure Vessel Safety during Hydrotest by Acoustic Emission
Lee, J.S. ; Cho, K.S. ; Choi, J.M. ; Chang, H.K. ; Oh, S.K. ;
Journal of the Korean Society for Nondestructive Testing, volume 8, issue 1, 1988, Pages 12~21
The behaviour of pressure vessel made of SS41 steel was investigated during hydrotest. AE tests were carried out for the vessels in as-manufactured, V-notched and weld-cracked state using microcomputer-based AE instrumentation. The following results were obtained: 1) In the case of source location using cylindrical program, to minimize the error of source location, the difference of max. Delta T values measured from each sensor should be kept as small as possible. 2) When crack grew, AE event rate increased continuously but AE event from the inclusions occurred intermittently, so by analyzing event rate, the source of AE could be derived. 3) From the spot welding part of supporter, many events with low energy occurred independent of Kaiser effect, which could be confirmed by analyzing energy parameter. 4) The b-value from the tensile specimen of was lower than that from normal specimen and the b-value from crack propagation was lower than that from deformation, so by analyzing peak amplitude distribution, the source mechanism could be derived from the b-value.
Determination of the Stress Intensity Factor by the Method of Caustics
Kim, S.C. ; Lee, O.S. ; Han, M.K. ;
Journal of the Korean Society for Nondestructive Testing, volume 8, issue 1, 1988, Pages 22~29
The optical method of reflected and transmitted caustics has been utilized in mechanics investigations. This relatively new experimental technique has been successfully applied on various fracture analysis such as static and dynamic c rack propagation studies, some elasticity problems and contact stress, etc, In this study, the stress intensity factors in thin polycarbonate specimens, a kind of optically anisotropic material, under Mode I loading condition are estimated by the method of caustics. The values of stress intensity factors obtained from theoretical caustics shape are compared by the experiment. It is confirmed that the two stress intensity factors agree well with Srawley's solution.
NDE Detection of Interfaces
Cheong, Y.M. ;
Journal of the Korean Society for Nondestructive Testing, volume 8, issue 1, 1988, Pages 30~37
Interfaces, both grain boundaries and phase boundaries, play a very important role in the mechanical behavior of structural materials. The problemis particularly intense in composite materials where interfaces play a primary role in the meehanical response of the composites. This paper will concentrate on the approaches to perform nondestructive evaluation of the interfaces in a man nor in which some measure of the mechanical behavior of the interface can be established. Some of the possible approaches that may have potential for the nondestructive evaluation of interfaces are optical, electronic/ electrical, and acoustic approaches.
A Study on the Relationship between Mechanical Property and Impedance Characteristics with respect to Tempering Temperature in Alloy Steels by Electromagnetic Method
Cho, K.S. ; Chang, H.K. ; Lee, J.S. ; Bae, J.S. ;
Journal of the Korean Society for Nondestructive Testing, volume 8, issue 1, 1988, Pages 38~43
Microstructure and mechanical properties of most steels change by heat treat treatment. Such variation of stucture and properties of steel cause an impedance change on electromagnetic induction coil. The objective of this study is, by searching the relationship between the mechanical property or microstructural changes and impedance value of induction coil, to examine the applicablity of a monitoring the heat treated condition of products nondestructively.
ECONOMY IN RADIOGRAPHY THROUGH QUALITY
Lenaerts, C. ;
Journal of the Korean Society for Nondestructive Testing, volume 8, issue 1, 1988, Pages 44~48
Quality and economy in radiography can be achieved by using the right techniques and the film material available on the market. Pre-packing with or without lead, under vacuum or not, play an important role provided the right kinds of procedures are applied. The author explains some of the ways used by different N.D.T.companies to achieve the best quality in an economical way.