-
Kenji KANEKO, Akira OHMORI, Shinji TUCHIYAMA
Article type: Article
Session ID: 422
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Kenji KANEKO, Atuhiko NANBA
Article type: Article
Session ID: 423
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Yukio SANOMURA
Article type: Article
Session ID: 424
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Yukio SANOMURA, Mamoru MIZUNO
Article type: Article
Session ID: 425
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Ryosuke MATSUMOTO, Hiroshi KITAGAWA, Keiko NAKATANI, Akihiro NAKATANI, ...
Article type: Article
Session ID: 426
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Tomotsugu SHIMOKAWA, Akihiro NAKATANI, Hiroshi KITAGAWA
Article type: Article
Session ID: 427
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Masahiko KATAGIRI, Hidehiro Onodera, Tetsuya OHASHI
Article type: Article
Session ID: 428
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
This paper describes the elastic softening due to the presence of defects in Ni_3Al. We calculated the elastic modulus under isotropic tensile loading by the fluctuation formula. Introducing the defects decreases the elastic constants and it reduces the elastic stability. The origin of the decreasing in the elastic constants is the negative increase of pressure-fluctuation contributions, which is induced by the atomic relaxation around the defects. The elastic softening facilitates the reduction of elastic stability and it gives the small critical volume of the fracture by the isotropic tensile loading.
View full abstract
-
Akihiro YAMADA, Toshiyuki SAITO, Mitsuharu SHIWA, Shigeo NAKAHIGASHI, ...
Article type: Article
Session ID: 429
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
The object of this research was to evaluate the temperature, strain and stress changes near the weld fusion line during welding, accurately. Therefore 3-dimensional thermal elastic-plastic analysis was carried out using the measured temperature data for evaluating the strain behavior and also stresses. To verify the numerical analysis, temperature changes were measured with thermocouples, and strain changes were measured with the laser speckle correlation method. The laser speckle correlation method can measure the surface strain directly without contact. Numerical analysis results were agreement with measured results. It was confirmed that the temperature, strain and stress changes near the weld fusion line were possible to be analyzed. This research was carried out by the Japan Power Engineering and Inspection Corporation (JAPEIC) as one of research works which was entrusted by the Ministry of International Trade and Industry (MITI) (currently, the Ministry of Economy Trade and Industry (METI)).
View full abstract
-
Hironobu NISITANI, Takashi KAWAMURA
Article type: Article
Session ID: 430
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hiroyuki KISHIDA, Mitsuo NOTOMI, Kikuo KISHIMOTO, Hirokazu SHIMODA
Article type: Article
Session ID: 431
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Yoshikazu SHINOHARA, Masaki OMIYA, Hirotsugu INOUE, Kikuo KISHIMOTO, T ...
Article type: Article
Session ID: 432
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Masayuki ASANO, Juichi FUKAKURA, Masaaki KIKUCHI
Article type: Article
Session ID: 433
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
This paper describes the analytical method of the residual stress distribution in the body using the measured surface value of the residual stress. The basic equation is derived from the boundary integral equation approach introducing pairs of the body force which present residual stress field and are corresponding to so called eigen strains caused by welding. The basic solutions on the displacement and stress fields by the body force dipole are derived and applied to the boundary integral equation approach. A simple example shows the applicability of the present method to the residual stress evaluation in the body.
View full abstract
-
Kazumune MAEJIMA, Kengo SHIMIZU, Akifumi OKABE, Noboru TOMIOKA
Article type: Article
Session ID: 434
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hironobu YUKI, Haruo ISHIKAWA, Shin-ichirou TADA
Article type: Article
Session ID: 435
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Yasuhiro OHTAKE, Humiki TOMIOKA, Takenori WATANABE
Article type: Article
Session ID: 436
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
3-points bending tests were performed to examine the bending strengths of three kinds of pipes consisting of porous alumna. Also, the effective volumes of those pipes were calculated in uni-axial (longitudinal) stress and multiaxial stresses, respectively. Analysis program "G-FICES was used to calculate the effective volume of the pipes in multi-axial stresses. The bending strengths of the pipes were decreased with increasing the effective volumes. Also, the calculated effective volumes in multi-axial stresses increased than that in uni-axial stress. It was found that the bending strengths of the porous alumna pipes of inner/outer diameters = 14mm/22mm, 22mm/27mm could predict from the 4-points bending strength of small specimen by using Weibull's theory when it used the effective volume in multi-axial stresses.
View full abstract
-
Hideki KAWATE, Shinobu YOSHIMURA, Genki YAGAWA
Article type: Article
Session ID: 437
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Masatoshi FUTAKAWA, Takashi WAKUI, Takuma KAWASAKI, Kaoru ONUKI, Sabro ...
Article type: Article
Session ID: 438
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
Micro-indentation technique was applied to evaluate the mechanical properties of corroded surface layers of Ni-alloy, 316SS, Ti and Ta, which were immerged into the corrosive gas environment consisting of HI+I_2+H_2O+H_2. It was simulated one of environments in the thermochemical hydrogen production, IS process, developed by JAERI. In particular, the degradation due to the corrosion attack by HI and the hydrogen embrittlement is a key issue from the viewpoint of material integrity in it. The micro-indentation tests using a spherical indenter and the inverse analyses with Kalman filter were performed to quantitatively estimate material constants of corroded surface layer. Ni-alloy exhibits good corrosion resistance and Ta is remarkably influenced by the hydrogen embrittlement.
View full abstract
-
Tadashi OKUDA, Haruo ISHIKAWA, Hironobu YUKI
Article type: Article
Session ID: 439
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Tomohiko MAKINO, Kenji GOMI, Yasushi NIITSU, Kensuke ICHINOSE
Article type: Article
Session ID: 440
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Qiang YU, Masaki SHIRATORI, Shinya IKEDA, Hironobu KIKUCHI
Article type: Article
Session ID: 441
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Qiang YU, Masaki SHIRATORI, Do-Seop KIM, Yasuhiro TAKAHASHI
Article type: Article
Session ID: 442
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hidehisa SAKAI, Masaki SHIRATORI, Qiang YU, Masahide KANEKO
Article type: Article
Session ID: 443
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hiroshi MATSUNO, Yoshihiko MUKAI
Article type: Article
Session ID: 444
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Hiroshi MATSUNO, Yoshihiko MUKAI
Article type: Article
Session ID: 445
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Seiji IOKA, Masahiro SAKAI, Shiro KUBO
Article type: Article
Session ID: 446
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Sumio TANAKA, Shinichi HIROTA
Article type: Article
Session ID: 447
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Weiming Tao, Yimu Guo, Jinquan Xu, Yoshiharu Mutoh
Article type: Article
Session ID: 448
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
Based on the conservation law of elasticity, a set of traction boundary integral equations have been developed. By using the non-hyper-singular traction boundary integral equations, this paper formulated the corresponding equations for 3D finite cracked bodies. Numerical algorithm for general 3D problems and a semi-analytical method for axisymmetric problems are presented. The results obtained by the proposed method are compared with the existed solutions. It is found the present method is very accurate and efficient.
View full abstract
-
Masanori KIKUCHI, Daisuke KATAGIRI
Article type: Article
Session ID: 449
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
The fatigue crack growth under mixed mode loading is simulated using FEM. The SIF(Stress Intensity Factor) values are evaluated precisely by the VCCM (Virtual Crack Closure Method). The crack growth direction is predicted by Erdogan-Sih criterion, and the crack growth rate is estimated by Paris law. Two kinds of mixed mode fatigue crack growth problems are analyzed and the fatigue crack growth behaviors are predicted numerically. The results are compared with those obtained by the conventional methods. The usefulness of the conventional methods for the safety assessment of the nuclear power plant is discussed.
View full abstract
-
Terutaka FUJIOKA
Article type: Article
Session ID: 451
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Tadashi HORIBE, Naoki ASANO
Article type: Article
Session ID: 452
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
This paper describes a study on an inverse analysis method to identify the crack parameters of beam with two cracks by the simple genetic algorithm. The cracks are simulated by an equivalent rotational spring model. By using this approximate model, a characteristic equation to calculate the natural frequencies of the system are derived employing the Bernoulli-Euler beam thory. In order to identify the crack locations and the depths of the beam from frequency measurements, objective function that consists of the sum of square errors of frequencies is formed. The genetic algorithm is used to search the minimum value of the objective function. The proposed method is verified by numerical simulation of some sample problems.
View full abstract
-
Katsuyuki KIDA, Akira KAWATA, Keiji OGURA
Article type: Article
Session ID: 453
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
Understandig the surface crack growth is important to clarify the mechanisms of rolling contact fatigue (RCF) of SUJ2, because the surface defects are made by indentations and cause flaking failure. In the present work, the small holes were artificially made prior to the RCF tests and the initiation and propagation of the surface cracks from the holes were observed. Based on the features obtained by the experiments, the initiation and propagation of the cracks were evaluated by calculating stress intensity factors.
View full abstract
-
Takashi HONDA, Tetsuya SASAKI, Etsuji YOSHIHISA
Article type: Article
Session ID: 454
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Mikiyo ITAOKA, Kazushi SATO, Toshiyuki HASHIDA
Article type: Article
Session ID: 455
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Akira MORITA, Hiroyuki KAGAWA, Shiro KUBO
Article type: Article
Session ID: 456
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Kenji MACHIDA, Hiroyuki OKAMURA, Kenichi SHIROTA
Article type: Article
Session ID: 457
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Koji FUJIMOTO, Toshifumi KAKIUCHI, Tadashi SHIOYA
Article type: Article
Session ID: 458
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Izuru NISHIKAWA, Keiji OGURA, Takahiro MIYATAKE, Koichi MASUKAWA
Article type: Article
Session ID: 459
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
The effect of stress shielding near the crack tip in Silicon Nitride ceramics was investigated using the Laser speckle strain / displacement gage by which a small crack opening displacement(COD) can be measured. A special attention was put on the influence of compressive loading on the stress shielding effect. From the result of COD measurement, it was found that the COD in ceramics was strongly affected by the applied stress ratio. Especially, the compressive loading was found to play an important role on the development of the stress shielding effect.
View full abstract
-
Toru TAKAHASHI, Koji TANIFUJI, Toshiyuki HASHIDA
Article type: Article
Session ID: 460
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Toshihisa NISHIOKA, Takehiro FUJIMOTO, Kengo KISHIMOTO, Masanori HASHI ...
Article type: Article
Session ID: 461
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Toshihisa NISHIOKA, Takeshi NUKASAKA, Takehiro FUJIMOTO, Ryouta NISHIO ...
Article type: Article
Session ID: 462
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Toyohisa Tooyama, Noboru Egami, Keisuke Tanaka
Article type: Article
Session ID: 463
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App8-
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Akihiko HIRANO, Masao SAKANE, Naomi HAMADA
Article type: Article
Session ID: 501
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Chikao KURAMOCHI, Norimasa CHIBA, Nagahisa OGASAWARA
Article type: Article
Session ID: 502
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Toshiyuki SAWA, Akira MURAMATSU, Yoshihito SUZUKI
Article type: Article
Session ID: 503
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Yasuyuki KATO, Toshhiro NAKAGAWA
Article type: Article
Session ID: 504
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Tomoyuki OUCHI, Yasuyuki KATO, Atsushi INOUE
Article type: Article
Session ID: 505
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Naoki FUKUDA, Tomoki MASUDA
Article type: Article
Session ID: 506
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Seiichi OHTAKI, Shin KOBAYASHI, Takahiro YAMAMOTO
Article type: Article
Session ID: 507
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
The authors study the numerical simulation of elasto-plastic problem under plane stress by the finite element method. Calculation is conducted by making use of commercial based software LUSAS . Numerical examples are shown for the thin plate with a central flat hole subjected to proportional loading and cyclic loading. Results are compared and discussed due to the differences of definition of yield points, approximation of stress-strain diagrams and loading paths.
View full abstract
-
Junho SONG, Masashi KANDATSU, Kensuke ICHINOSE
Article type: Article
Session ID: 508
Published: July 19, 2001
Released on J-STAGE: August 01, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
This paper essays to demonstrate the use of Lueders' lines as a smart failure-sensor. By observing the initiation, propagation, and distribution of Lueders' lines, it is possible to analyze the failure condition affecting multiple holes in a specimen subject to cyclic loading.
View full abstract