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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
- Transactions of the Japan Society of Mechanical Engineers Series C
- Transactions of the Japan Society of Mechanical Engineers Series B
Volume 69, Issue 687
Displaying 1-20 of 20 articles from this issue
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Kyotaro YOSHINO, Masakazu INABA, Genki YAGAWA, Toshimitsu FUJISAWA2003 Volume 69 Issue 687 Pages 1524-1530
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe authors developed a fully automatic system for crack propagation analysis employing a node-based finite element method, which is featured by a local mesh generation technique. In this method, local meshes are robustly generated around each node, even for singuler boundary shapes such as cracks. Thus, both pre- and main-processings of finite element analysis could effectively be performed in parallel, if the system would be implemented on parallel computers. This method enables us to deal with multiple crack propagations automatically. Several applications of the proposed tehnique were presented to illustrate its robustness and superiority.View full abstractDownload PDF (1005K) -
Stress Intensity Factor Analysis of a Crack on an Interface between Dissimilar Anisotropic MaterialsKoh YAMANAGA, Toru IKEDA, Noriyuki MIYAZAKI2003 Volume 69 Issue 687 Pages 1531-1538
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSA new method is presented for stress intensity factor analysis of a crack between dissimilar anisotropic materials. The virtual crack extension method, which is used with the finite element method, is a powerful tool for estimation of the energy release rate. The virtual crack extension method is applied to stress intensity factor analyses of a crack between dissimilar anisotropic materials. The energy release rate obtained by the virtual crack extension method is separated into individual stress intensity factors, KI, KII and KIII, using the principle of superposition. We applied this method to a center interface crack between dissimilar jointed anisotropic plates. The results are compared with analytical solutions. It is found that the energy release rate and stress intensity factors obtained by the present method are very accurate and insensitive to the size of finite elements.View full abstractDownload PDF (722K) -
Katsuya SETOGUCHI, Toru TAKASE, Yumiko YAMASHITA2003 Volume 69 Issue 687 Pages 1539-1544
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSBased on the previously proposed damage rule and life prediction method for rolled bolt-nut joints under two-step loading, life prediction method for three-step loading and three-level multi-step loading was investigated. The effect of load histories and change of material properties with damage accumulation was taken into account in the prediction method. Required material properties were obtained from fatigue tests under constant stress amplitude and two-step loading. In order to investigate applicability of the life prediction method, axial load controlled fatigue tests of rolled bolt-nut joints were carried out. Experiments indicated that the predicted results were in good agreement with the experimental results.View full abstractDownload PDF (595K) -
Toshikazu SHIBUYA, Terutaka KAI, Kikuo KISHIMOTO, Hirotsugu INOUE, Ken ...2003 Volume 69 Issue 687 Pages 1545-1551
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn this study, we consider the elastic contact problem of half-space indented by flat and rigid punch with arbitrary cross section. The contact area of the punch is transformed into an unit circle by Schwarz-Christoffel mapping transformation. In the mapping plane, we assume the contact stress by the series terms with singularity. The coefficients of terms in the series are determined by using least square method. In each case of regular flat and polygonal punches such as pentagonal, hexagonal, octagonal ones and so on, we obtain the contact stress distribution approximately so that the displacements are constant in the contact area. In the case of regular flat and square punch with round corners, we obtain similar results. Then, we give the approximate expressions of contact stress for the flat and rigid punch with arbitrary cross section.View full abstractDownload PDF (1009K) -
Chiaki IHARA, Takeyuki TANAKA2003 Volume 69 Issue 687 Pages 1552-1558
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe mechanism of mode I fatigue crack propagation that the crack propagation consists of the initiation of the cleavage mode crack and the opening of it is proposed by the use of renewal stochastic damage accumulation model for crack propagation, in which the parameters are explained based on the dislocation density and the elastic energy of dislocation. The calculated results of ΔKeff for da/dn agree with the experimental ones. ΔKeffth is calculated under the condition that the energy of cleavage crack initiation is equal to the one given from the outside. The plastic zone size is calculated in consideration with the number of dislocation on the each slip line contained in it.View full abstractDownload PDF (690K) -
Yusuke / KIMURA, [in Japanese]2003 Volume 69 Issue 687 Pages 1559-1566
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSA defect consisting of missing cell walls in a honeycomb structure causes the cell walls ahead of the defect to be loaded more heavily than any others. In this paper, the stress concentration in the honeycomb core due to the defect was analyzed by using finite element method. First, the effect of the defect size on the tensile stress concentration was analysed. Based on numerical results it is found that this effect is approximately equal to that of a crack with length of (n+0.3)w, where n being number of defect cells and w the cell width, in an elastic solid. It is also found from the results of numerical analysis that there exists bending stress concentration in the cell walls ahead of the defect as well as the tensile stress concentration and the bending stress is generally larger than the tensile stress in the first cell wall ahead of the defect. An approximate method for calculating the bending stress concentration was proposed. Also, the interference effect of two defects was discussed.View full abstractDownload PDF (778K) -
Dai-heng CHEN, Kenichi KOHANAWA, Isao SAKAUCHI2003 Volume 69 Issue 687 Pages 1567-1573
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn this paper the stress singularity at the corner of a T-shaped junction is studied by eigenfunction expansion method. In the eigenfunction expansion method, the stresses in each plate are approximated by a plane stress state, and the antiplane deformation is also taken into account. The eigenequation for the asymptotic behavior of stresses around the coner tip is given in an explicit form for the case of γ = 180°. It is different from the analysis in which the antiplane deformation isn't taken into account that the eigenvalue is a complex with real part equating 0.5. The obtained results are verified by numerical results of the finite element method.View full abstractDownload PDF (647K) -
Nozomu SAKURAI, Haoyu HUANG, Toshiyuki TAKAGI, Tetsuya UCHIMOTO2003 Volume 69 Issue 687 Pages 1574-1580
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThis paper describes improvement of an arrayed multi-coil probe of eddy current testing for steam generator tubes which was previously reported by the authors. Owing to the multi-coil arrangement, the present probe can detect cracks in the whole round of the tube without rotation, which leads to speedy scan of tubes. However, the authors confirmed the existence of leas sensitive zone in the previous paper. In this paper, arrangement of element coils was considered with the help of numerical simulation so as to eliminate less sensitive zones. Experiment with use of the improved probe showed that maximum decrease of crack signals was improved to be 5% from 20% due to the change of coil arrangement in the probe. In addition, it was confirmed that the present probe can detect a outer defect of 20% in steam generator tubes with simulated support structures which are noise sources.View full abstractDownload PDF (1058K) -
Hiroshi OKADA, Yasuyoshi FUKUI, Noriyoshi KUMAZAWA2003 Volume 69 Issue 687 Pages 1581-1588
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn this paper, formulations for the analysis of particulate composite materials whose particles undergo particle fracture/interface debonding or stress induced phase transformation. The formulations are developed based on a boundary element based homogenization technique where the influences of differences in elastic properties between matrix and particles and transformation strains are accounted for by using analytical expressions. Macroscopic stresses are computed based on the homogenization method. Hundreds of particles which undergo particle fracture/interface debonding or stress induced phase transformation are placed in a unit cell for the homogenization analysis. Thus, quasi-smooth macroscopic stress-strain curves can be generated based on particle fracture/interface debonding or phase transformation criterion for each particle. 650, 125, 35 and 3 particle modeles are analyzed in this paper.View full abstractDownload PDF (921K) -
Masatoshi MIKI, Tsutao KATAYAMA, Hidetake YAMAMOTO2003 Volume 69 Issue 687 Pages 1589-1594
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe solid-air composites will be proposed to make a new movement of the composite material design. The purpose of the present study is to investigate the static load dispersion function caused by the internal hydrostatic pressures by applying numerical analysis. To simplify the evaluation of the static load dispersion, it was supposed the admissible stress field, where each stress field in closed cells is individual and two different stress fields being in both sides of a cell wall satisfy the equilibrium of forces through the cell wall. Non-linear deformation under in-plane indentation of the solid-air composites was incrementally simulated by using the finite element formulation based on displacement method. It was shown that the assumption of admissible stress field on the interfacial load transmission is useful in evaluating the static load dispersion because the numerical results were well in agreement with the experimental ones.View full abstractDownload PDF (895K) -
Eiji NAKAMACHI, Naofumi YOKOYAMA, Kohei FUJITA, Yipping CHEN, Kiminori ...2003 Volume 69 Issue 687 Pages 1595-1600
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe crystal plasticity finite element (FE) method, by employing a crystalline ODF data and "Orientation Probability Assignment Method", has been applied for textural design of a dual phase high-strength and high-formability sheet steel. At first, the texture characterization of ferrite, martensite and dual phase steels were carried out by using EBSD and ODF analyses. Second, an optimum textural design algorithm is proposed to find an artificial texture of dual phase steel sheet, by combining ferrite and martensite phases, which shows high strength and high formability, through cylindrical cup deep drawing and VDI benchmark forming process simulations.View full abstractDownload PDF (1038K) -
Kazuyoshi TSUCHIYA, Toshiaki KITAGAWA, Yuji OKUDA, Eiji NAKAMACHI2003 Volume 69 Issue 687 Pages 1601-1605
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSPb(Zr, Ti)O3 piezoelectic material (PZT) has been utilized for a microactuators or microsensors, because of a higher power and a larger displacement than the other piezoelectric materials such as BaTiO3. But, there remains the difficulty to find a best materil process of a very thin film actuator. In this study, PZT thin films were deposited onto a heated Invar alloy substrate by using a high temperature RF magnetron sputtering appoaratus. When the ceramic target is used, the deposition rate and crystal structure of the film has strongly affected by the position of substrate against the target, as well as the temperature, the gas flow rate, the composition of target, and so on. We found the best position of substrate against the target to have a high-deposition rate and an optimum crystal structure, such as within 40∼70% distance from a center of the target in the radial direction. The crystalline structure of deposited PZT in this region was also measured by XRD. The largest intensity of crystal plane (110) PZT Perovskite structure was observed.View full abstractDownload PDF (832K) -
Yasuhiko NAKANISHI2003 Volume 69 Issue 687 Pages 1606-1612
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn the process of topology optimization, topology of a structure is, in general, changed in succession. In this paper, a method of inferring the change of topology is proposed. This method makes it possible to impose constraint conditions upon topology of the structure. Topological constraint conditions can be expressed by homology groups. As a numerical example, topology of a plate is optimized using an artificial model (the density approach) under topological constraint conditions that (I) the structure is not divided into pieces during the optimization process, and (II) the number of holes is less than or equal to the prescribed number. As a result, it was found that (1) topological constraints were correctly satisfied by the proposed method, (2) the least useful members tend to be removed by topological constraints, and other ones are reinforced, and (3) the strain energy of structures obtained under certain topological constraints is somewhat higher than that of ones without topological constraints.View full abstractDownload PDF (1020K) -
Kohei YUGE, Susumu EJIMA, Junichi ABE2003 Volume 69 Issue 687 Pages 1613-1620
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn this paper, we propose a topology optimization method of a structural members for crash-safety by using density approach. This method is based on the generalized layout optimization method and design variable is a virtual isotropic material whose properties are functions of the element density. Since this virtual material is isotoropic, we can employ a well known flow theory in a crash analysis and make the calculation time much shorter than the generalized layout optimization method with the homogenization mehod which requires a complex material database for the elasto-plastic stress-strain relation of a porous material. Moreover, we also utilize the MPI (Mesaage Parallel Interface) of parallel computing to reduce the calculation cost. Several numerical examples are shown to verify the present method.View full abstractDownload PDF (1325K) -
Masanori KIKUCHI, Jun SASAKI2003 Volume 69 Issue 687 Pages 1621-1627
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe three kinds of fracture specimens are tested under different constraint conditions. One is 3 PB (Three Point Bending) specimen, another is CCT (Center Cracked Tension) specimen, and the third one is called CCB (Center Cracked Bending) specimen. It is shown that the roughness of fracture surface and J-R curve are different from each other largely. And, the three 3 PB specimens with the different initial crack length are tested. It is shown that J-R curve is different from each other. They are the effect of constraint condition. In this study, the dimple fracture process is simulated by the finite element method using Gurson's constitutive equation, and the crack tip stress fields are obtained. The fracture pattern and J-R curve qualitatively agree with those of experiments, and the dimple fracture is well simulated.View full abstractDownload PDF (1650K) -
Masayoshi SHIMIZU, Takahito GOSHIMA2003 Volume 69 Issue 687 Pages 1628-1634
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSIn the present paper, temperature dependence of damage on CFRP laminates subjected to collision of steel ball was considered from viewpoint of impact load and impulsive stress. The histories of impact load and transverse stresses in a CFRP laminate are analyzed theoretically by means of three-dimensional theory and Hertzian analysis of contact with anisotropic thermoviscoelastic property. Impact damages were generated by collision of steel ball under various thermal conditions. As a result, the maximum of transverse stresses subjected to collision of steel ball are influenced by impact load and they suddenly decrease over the primary glass transition temperature. When transverse stresses are compared with delaminations, large transverse shear stress occurs in the direction where delamination progresses greatly. Therefore the direction to progress of a delamination is explained by the transverse shear stress distribution. And the transverse stresses and delamination areas are small under high thermal environments.View full abstractDownload PDF (776K) -
Kyoji HOMMA, Suguru KUSANAGI, Sayuri MURAKAMI2003 Volume 69 Issue 687 Pages 1635-1640
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSAn automatic system of ultrasonic inspection with a multi-layered neural network software to adhesive surface defects between CBN segment chips and a disk periphery has been developed to serve the guarantee of the quality of the grinding wheel. The network was used to contrive the accuracy improvement of the inspection. The waveforms reflected from the adhesive location of either prescribed artificially exfoliated defect or non-defect were investigated in detail to distinct the characteristics of the waveform. The network learned preferentially with both defect and non-defect waveforms, and also the improvement of the network learning compensated the amplitude of the wave near the edges was implemented. The inspection was performed to the grinding wheel with being unknown defects by using the learned network. Inspection results supported that the inspection system contributes the decision of the adhesive integrity of the CBN grinding wheel.View full abstractDownload PDF (992K) -
Mitsuo NIINOMI, Toshikazu AKAHORI, Jong-heon KIM, Hirokazu TAJIMA, Tak ...2003 Volume 69 Issue 687 Pages 1641-1648
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSAlthough research and development of biomaterials, such as an artificial bone, are done recently, it cannot be said yet that research of bones is enough. There is, in particular, still very little knowledge about fracture toughness of bone and the effect of microstructure on fracture toughness of bone. The effects of microstructure, slit introduction direction and slit tip radius on fracture characteristics of bovine compact bone were investigated in present study. On the fracture toughness value, Anterior and Lateral in which indeterminate form of osteons exit were higher than Posterior and Medial in which round form of osteons exist, as well as the case of L-C specimens was higher than the case of C-L specimens. In addition, such a high value is shown as a slit tip radius becomes larger. However, the fracture toughness value is higher in the specimen with fatigue precrack than in the specimen with slit. The difference in the fracture morphology of osteon is observed according to the slit direction.View full abstractDownload PDF (1456K) -
Takaaki SUZUKI, Eiji MATSUMOTO2003 Volume 69 Issue 687 Pages 1649-1656
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSMagnetic and mechanical rate-type constitutive equations are derived by taking into account of the magnetoelastic couplings. The proposed magnetic constitutive equations can involve the conventional typical magnetic models extended to the stress dependence. From the structure of the constitutive equations, it is shown that the stress magnetization effect can be derived from the stress dependency of the magnetization and the magnetostriction curves. For a typical ferromagnetic material, the Basso-type extended Preisach model is employed in the magnetic constitutive equation and the coefficients of the constitutive equations are identified by the magnetization and the magnetostriction tests of nickel under several stress levels. Simulated stress magnetization effect is found to agree with the experimental result better than the simulated result using the other typical magnetic model, i.e. the extended Jiles model.View full abstractDownload PDF (983K) -
Rongguang WANG, Mitsuo KIDO, Naoki MORIHIRO2003 Volume 69 Issue 687 Pages 1657-1663
Published: November 25, 2003
Released on J-STAGE: February 21, 2008
JOURNAL FREE ACCESSThe wetting characteristics of micro-droplets of distilled water on natural mica and pretreated (wet polishing, air oxidation and water immersion) metals surfaces were observed with an atomic force microscope (AFM) in AC non-contact mode. The micro-droplets were more stable than the macro-droplets in ambient air. The micro-wettabilities were higher than the macro-ones for all specimens and the scatter of values was large. A thin liquid layer of adsorbed water and organic contaminants was found on the chromium surface in ambient air. Micro-droplets deposited by post-wetting always occupied positions with little or none organic contaminant, which might explain the observed higher wettability for micro-droplets than macro-droplets.View full abstractDownload PDF (1033K)
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