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Volume 21, Issue 161
Displaying 1-14 of 14 articles from this issue
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Tsuneshichi TANAKA, Shuji HATTORI1978 Volume 21 Issue 161 Pages 1557-1564
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThis is a second report of authors aiming to clarify the mechanism of the initial increase of the plastic strain amplitude Δεp of low carbon steels under fatigue load. Close observations showed that a sharp increase of Δεp took place after a gradual growth, and this gradual growing process had been analyzed in the first report by developing the interaction models between dislocations and solute carbon atoms under repeated load. Therefore, in this report, a sharp increase of Δεp is theoretically dealt with by establishing a multiplying model of dislocation loops from the Frank-Read sources whose activation took place following the cease of the increase in the length of the movable dislocation lines upon reaching the strong pinning points. It is shown that the derived theory satisfactorily explains the experimental trend.View full abstractDownload PDF (831K) -
Kichiro ENDO, Kenjiro KOMAI, Kazuhiro KIMURA1978 Volume 21 Issue 161 Pages 1565-1570
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSFatigue tests of pre-cracked specimens of a mild steel have been conducted in 1%NaCl solution at various cycle frequencies, and an application basis of cathodic protection to decrease crack propagation rate and the damage due to hydrogen embrittlement have been discussed. The efficiency of cathodic protection depends extraordinarily upon stress cycle frequency. At a high cycle frequency the application of cathodic protection does more harm than good. The benefit of cathodic protection can be expected at a frequency lower than 100 c/min. However, there exists an optimum potential for cathodic protection, that is E =-0.8 V vs. SCE, to suppress the crack rate in corrosive environment. The application of excess cathodic current which was beneficial in a smooth specimen should be avoided to prevent corrosion fatigue of a cracked material even if it is ductile.View full abstractDownload PDF (1046K) -
Toshiaki HARA, Toshikazu SHIBUYA, Takashi KOIZUMI, Ichiro NAKAHARA1978 Volume 21 Issue 161 Pages 1571-1575
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe problem considered is one of determining the stress field in the vicinity of an annular crack embedded in the infinite elastic solid under bending. The solution is obtained by assuming that the displacement component on the crack face may be expressed in the form of appropriate Fourier series and then the resulting system of integral equations to the problem of solving the infinite system of algebraic equations. The numerical results given in the paper include the stress intensity factors, and the stress and displacement distributions. The effect of the crack on the stress produced in the solid by an asymmetric normal loading is also considered.View full abstractDownload PDF (487K) -
Ryuichiro IDE, Fusahito YOSHIDA, Eiryo SHIRATORI1978 Volume 21 Issue 161 Pages 1576-1582
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSCyclic creep behaviors of material have generally been studied by the load controlled tension-compression low-cycle fatigue tests. The results obtained by the load controlled tests include the effect of the increase of the maximum tensile stress due to the progress of axial strain, in addition to the effect of cyclic softening of the material. To separate the two effects clearly, true-stress controlled cyclic tension-compression tests are made with brass and the results obtained are compared with those by the load controlled tests. Cyclic creep curves under true-stress controlled condition are found to consist mainly of the primary transient and the secondary steady stages, with lack of the tertiary accelerating stage. Cyclic creep characteristics are formulated as a function of the maximum cyclic stress and the number of cycles. A criterion of the unstable fracture under cyclic creep is also given.View full abstractDownload PDF (618K) -
Toshiaki HARA, Toshikazu SHIBUYA, Takashi KOIZUMI, Ichiro NAKAHARA, Ta ...1978 Volume 21 Issue 161 Pages 1583-1587
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn this paper, we measured the deformation of the free surface of a thick elastic plate indented by rigid, circular or arbitrary polygon-shaped punches, and showed experimentally that the surface deformation by the punch in the polygonal shape is good agreement with the result for a circular punch by the use of the conformal mapping technique.View full abstractDownload PDF (548K) -
Hiroo MIYAIRI, Masahiro NAGAI, Atsuyoshi MURAMATSU1978 Volume 21 Issue 161 Pages 1588-1594
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSSandwich construction is composed of hard polyurethane foam(PUF) as core and glass-mat FRP(GRP) and aluminium(Al) as facing. The flexural fracture and mechanical properties of this nonsymmetrical sandwich construction are examined. The behaviors of flexural fracture of GRP/PUF/Al sandwich construction, which is loaded with GRP on tension side, are examined for flexural stress, strain etc. to consider the elasto-plastic deformation of GRP, and are numerically analyzed using a flexural load-deflection diagram of this sandwich construction. The flexural experiment has been made for comparing with the results of theoretical analysis on the mechanical properties of this sandwich construction. And this analytical method applied to the process of flexural fracture can be practical enough for the estimation of flexural strength and theoretical flexural load-deflection diagram.View full abstractDownload PDF (852K) -
Toshio HATTORI, Kozo IKEGAMI, Eiryo SHIRATORI1978 Volume 21 Issue 161 Pages 1595-1601
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe rotating strength of a circumferentially fiber-reinforced disc depends on the radial strength of disc material. Increasing the rotating strength of the disc of a given composite material requires to reduce the maximum radial stress as much as possible. The utilization of the hoop effect of the outer fiber layer of high elastic modulus, as a method of reducing the radial stress, is theoretically investigated and experimentally confirmed with glass-carbon fiber-reinforced hybrid discs. Applicability of the circumferentially fiber-reinforced disc as the flywheel is discussed.View full abstractDownload PDF (797K) -
Toshihiro IRIE, Gen YAMADA1978 Volume 21 Issue 161 Pages 1602-1609
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThis paper studies the free vibration of a circular plate whose deflection, rotation and torsion are elastically supported at some points located inside the plate or on the circumference. Regarding the reactive forces and moments at all points as unknown harmonic exciting loads, the stationary response of the plate to these loads is derived. The natural frequencies and the mode shapes of the plate are calculated by determining the unknown quantities with use of constraint conditions at the supports. Applying the method to a circular plate supported at some equispaced points of equal radii, the natural frequencies and the mode shapes are calculated numerically. From the result of this study, it is concluded that the natural frequencies of the plate become larger with an increase in the stiffness and the number of supports, but they do not vary monotonously according to the location of the supports.View full abstractDownload PDF (684K) -
Kazuyasu MATSUO, Shigetoshi KAWAGOE, Tatsunori OGAWARA1978 Volume 21 Issue 161 Pages 1610-1617
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSAn experimental study has been performed of the starting process of a supersonic Ludwieg tube with a diaphragm or a quick-opening valve located downstream of the nozzle. The starting times of the steady flow in the supply tube and in the nozzle are compared with the results of the upstream valve configuration reported in the previous paper. The starting process of the nozzles with a downstream valve is calculated by a method of one-dimensional characteristics, assuming an instantaneous opening of the valve, and the mechanism of the starting process is discussed for the case where starting shock waves are produced and for the case where a supersonic flow is established in the nozzle without producing the shock waves.View full abstractDownload PDF (921K) -
Hiroshi KATO, Keizo WATANABE, Kotaro NAYA1978 Volume 21 Issue 161 Pages 1618-1625
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSTo study the characteristics of the fluid flow near a rotating disk in dilute polymer solutions, the oil film and the tracer techniques were employed. The flow angle of the boundary-layer on the rotating disk was measured using the oil film technique, and the correlation between the flow angle and the coefficient of the frictional moment was discussed. The velocity distribution of the laminar boundary-layer of an enclosed disk was measured using the tracer technique, and the boundary-layer characteristics of the dilute polymer solutions were made clear.View full abstractDownload PDF (1372K) -
Hiroyuki HASHIMOTO, Tamotsu MATSUYA1978 Volume 21 Issue 161 Pages 1626-1633
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSAn experimental study has been carried out to investigate a radial outflow type of air-water two-phase swirling flows in a short vortex chamber. The high speed two-phase swirling flow has been measured by the sampling probe over a wide range of feed water flow rates, qualities, pressures and exhaust flow rates from the outer wall. As a result the fluid dynamic performance of radial outflow type, that is, flow patterns, void fractions, velocity distributions and the effects of centrifugal separation are made clear. It is also made clear that the fluid dynamic performance can be improved by the application of the radial outflow to a vortex type-two-phase MHD power generator rather than the radial inflow.View full abstractDownload PDF (864K) -
Yukio MIZUTANI, Kazuaki YANO1978 Volume 21 Issue 161 Pages 1634-1641
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe blowoff and blowout behaviors and the mechanism of attachment to the burner port were examined experimentally for coaxial-flow jet diffusion flames, paying attention to the effects of the rim thickness, velocity combination and swirl intensity. A recirculating flow is formed in the wake of the burner rim, which plays a major role in the process of flame attachment especially for thick-rim burners. The blowout and blowoff limits, therefore, are expressed in a universal form in terms of the momentum flux ratio of the fuel jet to the coaxial air stream and of the velocity of the latter, since the momentum flux ratio governs the configuration of the recirculation zone whereas the latter is related to the intensity of shear or turbulence in and around the recirculation zone.View full abstractDownload PDF (851K) -
Kenji MATSUURA, Kazuo TERASAKI, Ichiro WATANABE1978 Volume 21 Issue 161 Pages 1642-1651
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe behavior of three kinds of apex seals against the trochoidal surface was analyzed experimentally by measuring in synchronization with each travel of the seal along the surface, the change in electrical resistance between an electrically insulated sliding surface of an apex seal and the trochoidal surface. The results of this experiment revealed that a temporary lift-off of the apex seal from the trochoidal surface and inadequate contact of the mutual sliding surfaces could be observed under various load and speed conditions and they are explained by dynamic calculations.View full abstractDownload PDF (1276K) -
Hiroaki FUNABASHI, Kiyoshi OGAWA, Mikio HORIE1978 Volume 21 Issue 161 Pages 1652-1659
Published: 1978
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe equations of motion of arbitrary moving links and the constraint equations of pairs have been generally derived with consideration of the elastic deformations of pairing elements and frictions, which make it possible to construct systematically the equations of motion of plane multilink mechanisms with clearances. The dynamic characteristics of a slider-crank mechanism with a clearance have been theoretically and experimentally analyzed, revealing the influences of the clearance and the crank speed upon the relative motions between the pairing elements, input torque and output displacement.View full abstractDownload PDF (1043K)
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