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Volume 29 (1991)
- Issue 6 Pages 318-
- Issue 5 Pages 252-
- Issue 4 Pages 186-
- Issue 3 Pages 130-
- Issue 2 Pages 68-
- Issue 1 Pages 2-
Predecessor
Volume 29, Issue 4
Displaying 1-7 of 7 articles from this issue
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Kiyoshi BESSYO, Shuichi SUZUKI, Kazushige ARIMOCHI, Hiroshi YAJIMA, Ma ...1991 Volume 29 Issue 4 Pages 186-193
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSThis paper presents a newly-developed TMCP steel plate which enables the reliable construction of LPG carriers with highly efficient automatic welding and shop working. In order to develop the new steel plate, the recent refined microalloying technology with trace elements of Ti, Nb and B, as well as the advanced Thermo-Mechanical Control Process, was fully utilized. The application of the new steel plate to LPG carriers was confirmed to bring about the noticeable improvement in propagating crack arrest capability, fracture toughness reliability even at high heat-input welding, and shop workability.View full abstractDownload PDF (819K) -
Hiroshi MIMURA1991 Volume 29 Issue 4 Pages 194-201
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA study was made on the correlation between transition temperature of Charpy characteristics and that of fracture toughness for a low carbon 3.5% Ni steel heat treated in various conditions.
Fracture toughness was measured in terms of COD for crack initiation and represented by fracture appearance transition temperature of press notched Charpy test which is considered to evaluate crack arrestability.
The results are summarized as follows:
(1) A tempered martensite steel has rather low crack arrestability in spite of its relatively good V-notched Charpy characteristics.
(2) A temper-embrittled steel has relatively large COD value in spite of its poor V-notched Charpy characteristics.View full abstractDownload PDF (8760K) -
Masahiro SESHIMO, Shukuji ASAKURA1991 Volume 29 Issue 4 Pages 202-209
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSThere are various defect holes on pipe buried underground.
In this study, a pipe with a circular hole as the defect hole was used. A lining with a Seal Hose was applied inside the pipe, and a series of creep tests for the lining was carried out in order to estimate burst pressure after a long period of time.
As a result, it can be estimated that the long term tensile strength in 50 years will become approx. 80% of the short term tensile strength.
In case that the Seal Hose is installed in a pressure pipe with holes and will be used at 23°C for 50 years, its burst pressure at holes will become 60% of the calculated value from the short term tensile strength.View full abstractDownload PDF (627K) -
Osamu YOKOTA1991 Volume 29 Issue 4 Pages 210-217
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSAs for the accuracy of surface crack size measurement by electro magnetic testing method, presentation of stress is one of the most serious practical problems in material construction. The author applied detective signals to stresses using magnetic particle testing method, magnetic leakage flux testing method, electrical resistance method and eddy current testing method.
The results obtained in this study are considered to justify the following conclusions:
(1) Magnetic leakage flux density from fatigue cracks is a function of distance between two Hall elements and surface of the test pieces. when tensile stress added to the fatigue cracked test piece, leakage flux density became larger. But, it decreased to zero, when the compressive stress which was from 200 to 250MPa was added to test piece.
(2) The magnetic particle indication was a little influenced by the compressive stress at 250MPa.
(3) In detection of the stress acting on the fatigue surface crack, the indicative value by electrical resistance method became smaller when the compressive stress was applied to test piece.
(4) Tensile stress applied perpendicular to the fatigue cracks gave no change the indicative value by electromagnetic induction testing method, but the compressive stress of 150MPa decreased indicative value.View full abstractDownload PDF (5772K) -
Akihiko SUZUKI1991 Volume 29 Issue 4 Pages 218-229
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSThe strength evaluation method for engineering ceramics is described. The method is based on the Weibull statistics and the weakest-link theory. In the method, ceramics is treated as a brittle body containing many defects of various sizes. When any one of such defects satisfies the fracture criterion, the fracture of the whole body occurs. The size distribution of the defects is such that the strength distribution of the body obeys the 2-parameter Weibull distribution. The time-dependent strength is represented as a result of the SCG (Slow Crack Growth). The concept of the effective loading stress is shown to be very useful to evaluate the time-dependent strength of ceramics.
Many aspects of the method which appear in the application to the practical use are described such as fast fracture, static fatigue, dynamic fatigue, cyclic fatigue, effective volume, 3-parameter Weibull distribution, minimum strength, determination of Weibull modulus, fatigue limit, unified estimation method of strength, environmental effects and nonlinear fracture mechanics.
A brief explanation is also made here about an example of strength design guides for ceramic components which is based on the evaluation method described above.View full abstractDownload PDF (1380K) -
Takuya SATO, Hideo KOBAYASHI, Yoshio ARAI1991 Volume 29 Issue 4 Pages 230-235
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA three-dimensional finite element analysis was performed to obtain a detail residual stress distribution of a ceramics/metal joint. A peak tensile stress occured near the interface in a ceramic side and showed a maximum value on edges. Several types of two-dimensional analyses, i. e. plane stress, plane strain, generalized plane strain and axisymmetric analyses, were also performed. These results were compared with that of the three-dimensional analysis. It was concluded that the axisymmetric analysis shows a good agreement with the three-dimensional analysis and the peak stress can be approximately estimated by superposing results of the plane stress and plane strain analyses.View full abstractDownload PDF (552K) -
Yoshiyasu ITOH, Kiyotaka TANAKA, Hideo KASHIWAYA, Takatsugu OKADA, Mas ...1991 Volume 29 Issue 4 Pages 236-243
Published: July 25, 1991
Released on J-STAGE: August 05, 2010
JOURNAL FREE ACCESSA computer-aided interactive system of named WRED (Welding Residual stress and Deformation analysis system) has been developed, which enables the structural designer and manufacturing engineer to conveniently analyze residual stresses and deformations of various structural components. This system consists of an interactive pre-processor, data bases, analysis of stresses and deformations and a post-processor of calculated results. The design of this interactive system is based on a use like handbook style. Namely, the analysis can be easily conducted by only the selection of menus and the data input acceding to a few commands. The welding residual stresses and deformations are mainly calculated by elastic analysis using a inherent strain. Also, various results computed by thermal elastic-plastic analysis and some measurement results by experiments can be easily picked out using a few commands.
The residual stress distributions of some welded components, such as butt welded joint, T welded joint, corner welded joint and lap welded joint, are measured by the stress relaxation method using strain gages. The experimental results are in good agreement with the calculated results by the WRED system. Consequently, it is confirmed that the developed system is useful to apply for predicting the residual stress and deformation.View full abstractDownload PDF (2679K)
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