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Predecessor
Volume 66, Issue 1
Displaying 1-17 of 17 articles from this issue
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[in Japanese]1993 Volume 66 Issue 1 Pages 1
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 2
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 3
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 4
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 5
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 6
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 7
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 8
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 9
Published: 1993
Released on J-STAGE: July 09, 2007
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1993 Volume 66 Issue 1 Pages 10-21
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 22-29
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 30-34
Published: 1993
Released on J-STAGE: July 09, 2007
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[in Japanese]1993 Volume 66 Issue 1 Pages 35-37
Published: 1993
Released on J-STAGE: July 09, 2007
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Takashi AKASAKA, Shigeru KAGAMI, Atsushi HASEGAWA, Manabu HANJYO1993 Volume 66 Issue 1 Pages 38-51
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe lateral stiffness of a multilayer elastomeric bearing under the vertical load is defined by the ratio of the lateral force to the relative displacement between the both end plates in the lateral direction. The buckling load is determined by the limiting condition that the lateral stiffness happens to be lost.
Several analytical studies have been presented up to date on the lateral stiffness by simplifying this laminated structure of steel plates and rubber layers, as a circular composite cylinder having homogeneous material properties.
In this paper, we derived a finite difference equation for the lateral displacement of each steel plate by utilyzing the bending and the shearing stiffness coefficients of a thin rubber layer, and obtained an explicit formula for the lateral stiffness of the elastomeric bearing, from which the buckling strength was determined. Then, we gave further an exact formula for the bending stiffness coefficient of the rubber layer sandwiched by two rigid plates and verified it experimentally.
It is shown that the buckling load calculated by this theory becomes considerably lower than that predicted by the previous theories. Additionally, the shearing stress distribution at the bonded surface between the rubber layer and the steel plate is discussed, providing an approximate formula for the maximum shearing stress.View full abstractDownload PDF (1244K) -
Tomohiro KURAMOCHI, Nobuo KISHI, Takehiko KIKUCHI, Masaru IBONAI1993 Volume 66 Issue 1 Pages 52-59
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe elastomer, poly (epichlorohydrin) (CO), was modified by graft polymerization with methyl methacrylate (MMA). Degrees of grafting increased in proportion to the rises in its monomer concentration, initiator concentration, reaction time and reaction temperature, but decreased in proportion to the rises in the amount of trunk polymer. While graft efficiencies increased in proportion to the rises in its amount of trunk polymer, and decreased by the monomer and initiator concentrations, but were almost constant by various reaction time and temperature. Degrees of grafting increased by a little addition of Lewis acid to this reaction system, but decreased by more addition, and graft efficiencies were almost constant by a little addition, but decreased by more addition. Furthermore, molecular weight of graft chains increased in proportion to the rise in monomer concentration, and number of graft chain increased in proportion to the rises in initiator concentration, reaction time and temperature. As a result of these, the graft polymer which had higher degrees of grafting were modified to harder polymer.View full abstractDownload PDF (792K) -
Tetsuo YOKOYAMA, Kyoko HIRAOKA, Xiao-dan LI1993 Volume 66 Issue 1 Pages 60-66
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe present paper reports a continuation of our study of the effect of the structure of network junction point on the properties of model polyurethane (PU) networks. NCO-terminated prepolymers prepared from polyols (PCL, PPG, and PTMG) and 2, 4-tolylene diisocyanate were end-linked with the mixture of trimethylol propane (TMP) and tris (2-hydroxyethyl) isocyanurate (THEI) of different molar ratios. Dynamic viscoelasticity and repeated stress-strain relationships were measured. With the increase of the content of THEI junction point, main dispersion peak of tanδ of PCL-based PUs broadened in the higher temperature side. Similarly, the peak of PPG-based PUs broadened, but a new peak appeared at around 130°C for THEI 100% system. For PTMG-based PUs, new broad maxima appeared at around 50°C. The dispersion at around 50°C was attributed to the molecular motion of aggregated structure of THEI junction point with polar urethane group in the network chain. The dispersion at around 130°C was attributed to the molecular motion of the aggregated structure of THEI junction points. In the repeated stree-strain test, stress-softening and hysteresis were negligible in the case PCL- and PPG-based PUs. However, in the case of PTMG-based PUs, stress-softening and hysteresis increased significantly with the increase of the content of THEI as a result of micro-inhomogeneity.View full abstractDownload PDF (782K) -
[in Japanese]1993 Volume 66 Issue 1 Pages 67-68
Published: 1993
Released on J-STAGE: July 09, 2007
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