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Atsushi SUGETA, Masahiro JONO, Yoshihiko UEMATSU, Kenji HIROSE, Eiichi ...
Article type: Article
Pages
647-648
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Yasuko MOTOYASHIKI, Atsushi SUGETA, Masahiro JONO, Yoshihiko UEMATSU, ...
Article type: Article
Pages
649-650
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Article type: Appendix
Pages
App29-
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Etsuo TAKEUCHI, Saburo MATSUOKA, Hisashi HIRUKAWA
Article type: Article
Pages
651-652
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Significance of ductile crack on the toughness evaluation was investigated using fractograpy. Full scale shaking table tests of beam-to-column connections for SM490A steel were conducted under the loading simulated Hanshin-Awaji earthquake of 30 through 100 kine at temperatures of 20℃ and 60℃. Ductile fracture surface specified by dimples was formed ahead of brittle fracture surface. The plot of energy and ductile fracture area for beam-to-column connections was higher than the plot for small Charpy impact specimens, which showed the unique curve independent of the materials and geometry of specimens. This is due to the fact that the energy was mainly consumed by forming ductile crack in Charpy specimens, while plastic deformation energy increased before forming ductile crack in beam-to-column connections.
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Akihide SAIMOTO, Yasufumi IMAI, Fumitaka MOTOMURA
Article type: Article
Pages
653-654
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Shinichi SUZUKI, Kenichi SAKAUE
Article type: Article
Pages
655-656
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Hitoshi WADA, Iwao Kondo, Katsuhiko MURASE
Article type: Article
Pages
657-658
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Toshihisa NISHIOKA, Takuma NOZAKI, Takehiro FUJIMOTO, Keigo SAKAKURA
Article type: Article
Pages
659-660
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Toshihisa NISHIOKA, Toru TSUDA, Takehiro FUJIMOTO
Article type: Article
Pages
661-662
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Mikio ODA, Masao ARITOMI, Masayuki TOYA
Article type: Article
Pages
663-664
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Noriyo HORIKAWA, Takayuki KUSAKA, Masayoshi MASUDA
Article type: Article
Pages
665-666
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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In order to clarify the strain rate effects on mode I, mode II and mixed mode (I+II) fracture behavior of graphite/epoxy laminates, fracture toughness was investigated over a wide range of loading rate from static to impact. MMF (Mixed Mode Flexure) and MMB (Mixed Mode Bending) specimens were used to evaluate the mixed mode fracture toughness. The mixed mode fracture toughness clearly showed strain rate dependence regardless of mode ratio; the mixed mode impact fracture toughness was about 10% lower than the local maximum value under static loading. Local maximum values existed at static loading rate for mixed mode fracture toughness, G_C. The mixed mode fracture toughness conform to the linear criterion for the region of high mode ratio, G_<II>/G_1=13,regardless of loading rates. However, it did not conform to the linear criterion for the region of low mode ratio, G_<II>/G_I≤3,and high loading rate, G≥(10)^2 J/m^2/s.
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Fergyanto E. GUNAWAN, Hiroomi HOMMA, Motoharu YAMAUCHI
Article type: Article
Pages
667-668
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Debonding strength of a GFRP is investigated under dynamic loading. The specimen is subjected to stress wave loading. A circumferential V notched is machined in the middle section of each specimen. The fracture initiates from the notch root and propagates to the interface. Using data gathered from a finite element analysis the separated dynamic J integral is computed. The result shown the critical dynamic J integral is larger than static J integral.
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Motoharu KONDO, Naoya NISHIMURA, Koichiro KAWASHIMA
Article type: Article
Pages
669-670
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Koichi KAIZU, Toshiro SAIKI, Kiyohiko IKEDA
Article type: Article
Pages
671-672
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Takehiro FUJIMOTO, Toshihisa NISHIOKA
Article type: Article
Pages
673-674
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Article type: Appendix
Pages
App30-
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Sastranegara AZHARI, Tadaharu ADACHI, Akihiko YAMAJI
Article type: Article
Pages
675-676
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Seung Min JANG, Tadaharu ADACHI, Akihiko YAMAJI
Article type: Article
Pages
677-678
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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In this study, we considered the effect of surface coating on impact damage reduction in carbon fiber reinforced plastics (CFRP) laminate. The CFRP laminate coated on the impact side or the backside by highly viscous epoxy resin was used as the specimen. The thickness of the coating was 1.0mm, or 2.0mm. The projectile was launched from an air gun and impacted upon the specimen. The impact tests using soft body projectile made of silicone rubber carried out. From the C-scan images obtained with a scanning acoustic microscope after the tests, we found that the damage mechanism of the specimens was similar, irrespective of the existence of coating. Compared with the relationship between the impact energy and the delamination area in the CFRP laminate, it was also found out that the coating technique using highly viscous epoxy is effective method improving the impact damage resistance of CFRP laminate.
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Goichi BEN, Toshiyuki UZAWA, Hiroyuki MITSUISHI, Takuya KARAKI, Akihik ...
Article type: Article
Pages
679-680
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Kazuo ASADA, Yasuhiro TAN, Katsunari OHSONO, Shuhei KURI
Article type: Article
Pages
681-682
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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We developed dry-type transportable storage cask (MSF69B cask) with high quality shock-absorber and seal structure. This high quality cask was proved through both 9m horizontal drop test of 1/4 scale model (2.07ton) and 9m horizontal /vertical/corner drop test of 1/2.35 scale model (10.1ton). This shock absorber is composed of balsa-wood and red-wood with high energy absorbing ability. Dependent lids structure (1^<st> lid and 2^<nd> lid contact each other and support inertia force of inner structures at 9m vertical drop test) is adopted in order to decrease lids/flange relative displacement. At 9m drop test of 1/2.35 scale model, lids/flange relative displacement is almost zero. Then, He leak rate at metal gasket dose not change before and after 9m drop test. Lids/flange relative displacement by LS-DYNA code is good agreement with that of experiment at 9m drop test of 1/2.35 scale model.
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Takashi YOKOYAMA, Takeshi MAYAMA
Article type: Article
Pages
683-684
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Impact tensile characteristics of sheet steels for automobile structural use are determined using a tensile split Hopkinson bar. Two different sheet steels (ultra-low carbon steel and high tensile steel) with 1mm thickness are tested. Small sheet tension specimens are machined from steel sheets of 330x330mm^2. Tensile stress-strain curves for the sheet steels at strain rates of nearly 1200/s are presented and compared with those at low and medium rates of strain obtained in an Instron testing machine. The effects of strain rate and extrusion direction on the tensile characteristics are examined. It is shown that ultra-low carbon steel exhibits higher strain-rate sensitivity than high tensile steel.
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Shigeyuki HARUYAMA, Ken KAMINISHI, Tomohiro YAMAMOTO, Toshifumi OGAWA, ...
Article type: Article
Pages
685-686
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Masaaki ITABASHI, Hiroshi FUKUDA
Article type: Article
Pages
687-688
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Y. ISHIHATA, M. DAIMARUYA, H. KOBAYASHI, R. A. SIREGAR
Article type: Article
Pages
689-690
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Toshifumi OGAWA, Shigeyuki HARUYAMA, Hirohide KAIDA, Ken KAMINISHI, Ts ...
Article type: Article
Pages
691-692
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Tsutomu UMEDA, Koji MIMURA, Shinji TANIMURA
Article type: Article
Pages
693-694
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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In order to extend our knowledge about characteristic behabiors, especially stress-strain relations, of materials under various strain rates, it is important to conduct dynamic material tests accurately. In this study, some numerical evaluations mainly about non-coaxial Hopkinson bar and sensing block methods were conducted. Both of these material testing methods have some advantages, respectively, and have newly developed in recent years.
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N. KAWAHARA, M. DAIMARUYA, H. KOBAYASHI
Article type: Article
Pages
695-696
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Akihisa ABE
Article type: Article
Pages
697-698
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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The present paper reports experimental measurements of particle velocity change at elastic-plastic shock wave fronts to estimate a hybrid numerical prediction method of particle velocity variation with shock wave propagation in metals. The elastic and plastic shock waves are generated in 6061-T6 aluminum by planer impact experiments using a single-stage light-gas gun that has 40mm muzzle diameter. Impact angles are also checked on using 4-pin-sensor system, and the particle velocity variations at the rear surface of target plates are measured by a velocity interferometer system (VISAR). High-resolution measurements on the plastic shock wave front are carried out, and detailed experimental data that are needed for evaluating the estimating simulation of the shock wave profile are obtained.
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Article type: Appendix
Pages
App31-
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Hiroaki SATO, Seiji IOKA, Shiro KUBO
Article type: Article
Pages
699-700
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Susumu YAMASHITA, Hideo KOGUCHI
Article type: Article
Pages
701-702
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Ryohei ITO, Hiroyuki AKEBONO, Jun KOMOTORI, Masahiro FUKUMOTO, Masao S ...
Article type: Article
Pages
703-704
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Rotational bending fatigue tests were carried out on medium carbon steel (S35C) with a thermally sprayed Ni-based self-fluxing alloy coating, with special attention focused on the effect diffusion layer on fatigue properties, which is formed between coating layer and substrate by a fusing treatment. The fused specimens show significantly higher fatigue strength compared to only substrate. And the more diffusion layer is formed, the stronger adhesive force is provided. The effect of diffusion layer on the fatigue strength and fracture mechanisms were investigated. As a result, fatigue strength of specimens fused very shortly or very longly has small improvement width.
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Shigenobu ASANO, Tutomu EZUMI, Masashi HACHIYA
Article type: Article
Pages
705-706
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Hironori SHIMIZU, Jun KOMOTORI
Article type: Article
Pages
707-708
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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A new testing machine that can apply corrosion, wear and fatigue to the specimen simultaneously was developed to estimate the corrosion behavior of the metallic biomaterials in-vivo. Potentiostatic polarization tests of Ti-6Al-4V alloy were performed under the condition of friction and cyclic loading by using the developed machine. Results show tnat corrosion reaction was increased by the action of wear and fatigue. A synergy of wear and fatigue in corrosion reaction was confirmed.
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Yuichi SHOYAMA, Michihiko NAKAGAKI
Article type: Article
Pages
709-710
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Growth or degeneration model of bone tissue of its internal structure is addressed. In modeling, the formation of voids in the bone's internal structure is focused and regards a volume rate and shape of void as a variable. The shape of the void is assmed in the form of a sphere or an ellipsoid. Global material characteristics of the bone is described by utilizing SCC model, a particle dispersed constitutive model based on the Self-consistent equivalent inclusion method. During the calculation, the shape and the orientation of the void are determined in the optimization adhared to the natural groth process so that the structure fits to the bone dynamics environment.
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Miki OTA, Sotomi Ishihara, Takahito Goshima
Article type: Article
Pages
711-712
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Rong guang WANG, Mitsuo KIDO, NAOKI Morihiro, Kouji MUKAII
Article type: Article
Pages
713-714
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Yoshihito OZAWA, Katsuo SUGIURA, Masayoshi WATANABE
Article type: Article
Pages
715-716
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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In order to certify the reliability of CFRP composites, we discuss the influence of high vacuum condition on compressive strength of CFRP composites based on experimental results. We tested two types of CFRP composites specimen, i.e. the CFRP cross-ply laminate and unidirectional composites. During the test we record load, displacement and strain by personal computer, and AE signals are recorded in order to detect the micro fractures. More AE signals are detected in the case of unidirectional composites rather than in the case of cross-ply laminate. By observing the fracture surface of specimen by scanning electric microscope (SEM), it is found that there are two different types of fracture mode for CFRP cross-ply laminates and unidirectional CFRP.
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Masayuki ARAI
Article type: Article
Pages
717-718
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Tohru TAKAMATSU, Yoshio MIYOSHI, Hirotaka TANABE, Kunihiro Kudoh
Article type: Article
Pages
719-720
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Shuhei OSAKI, Katsuyuki KINOSHITA, Nobusada TAKAHARA
Article type: Article
Pages
721-722
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Yukimasa ISHII, Kazuo NAGAHASHI, Yoshinori ISOMOTO
Article type: Article
Pages
723-724
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Hypervelocity impact tests were conducted with a 2-stage light gas gun test rig. Impact velocities were up to 5500 ms^<-1> in order to investigate the deformation behavior of target materials caused by hypervelocity impact of a spherical projectile. The deformation behavior was compared with that at relatively low impact velocities. The deformation behavior showed a mechanical property of target material under low impact velocities but showed fracture strength of a projectile of WC at a hypervelocity. Huge material removal by the hypervelocity impact of a projectile was observed at an shallow impact angle for the aluminum specimen.
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Haengsik JOO, Kunihiro YAMADA
Article type: Article
Pages
725-726
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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A study on the hydrogen embrittlement fracture behavior of high strength steel was carried out using round bar and thin walled hollow specimens, of which stress state would be plane strain condition and plane stress condition respectively. Cathodic hydrogen charging was used for introducing hydrogen in the specimen under sustained load conditions. As the thickness of the walled of hollow specimens became thin, the delayed fracture time showed the tendency that became long.
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Hiroki KITAHARA, Masanobu KUBOTA, Chu SAKAE, Kazuya TSUTSUMI, Yoshiyuk ...
Article type: Article
Pages
727-728
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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The crack closure and the corrosion current behaviors were measured for short crack in low cycle fatigue. The corrosion current was detected only for the range in which the crack was open. This suggested that the crack closure is the major cause for the insensitive strain range in high temperature water.
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S. NOMATA, S. ISHIHARA, T. GOSHIMA, S. SAKA
Article type: Article
Pages
729-730
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Keijiro NAKASA, Masahiko KATO, Manal Gomaa MAHMOUD
Article type: Article
Pages
731-732
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Article type: Appendix
Pages
App32-
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Tatsuo SAKAI, Takashi SHICHINO, Tsuyoshi TANAKA
Article type: Article
Pages
733-734
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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In evaluation of fine ceramic components reliability, it is very important to know residual stress introduced to the material surface in the fabrication process. X-ray diffraction method has been sometimes used to measure the residual stress for ceramics, but there are some difficulties in both high cost and exposure of harmful radiation. In order to overcome such difficulties, a simple indentation method to measure the residual stress was proposed by a committee in JSMS. In order to verify this method, the residual stress induced by a vice was actually measured. The residual stress thus obtained was in good agreement with the stress artificially provided by a vice.
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Yoshihisa SAKAIDA, Kazuyoshi NAKAJIMA, Youzou SAWAKI, Hiroshi KAWAMOTO
Article type: Article
Pages
735-736
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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Kaname MORI, Akira UCHIYAMA, Nobuyuki TAMURA
Article type: Article
Pages
737-738
Published: October 10, 2002
Released on J-STAGE: August 01, 2017
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