Journal of The Adhesion Society of Japan
Online ISSN : 2187-4816
Print ISSN : 0916-4812
ISSN-L : 0916-4812
Volume 47, Issue 2
Displaying 1-4 of 4 articles from this issue
Review
Review
Original Paper
  • Yoshia URAHAMA, Mariko SASAKI, Yosuke KATO, Keiko ITO, Yoshinobu NAKAM ...
    2011 Volume 47 Issue 2 Pages 46-52
    Published: February 01, 2011
    Released on J-STAGE: June 30, 2014
    JOURNAL FREE ACCESS
    FID signal of the macroscopic magnetization obtained by measurement of a pulsed NMR is data with very much amount of information of molecular structure,a degree of crystallinity,entanglement,etc. We havecomposed a program of calculating a relaxation spectrum by carrying out numerical differentiation of this FID signal directly.This relaxation spectrum has a close relation to the viscoelastic property of a acromolecule. So, we measured the pulsed NMRand dynamic mechanical analysis of the styrene block co-polymer,and analyzed the relation between a relaxation spectrumand the temperature dependency of a dynamic mechanical analysis (DMA) . As a result,the followings became clear. (1) In a low-temperature region,The temperature where a loss modulus changes is the same as the temperaturewhich thepeak value time of a relaxation spectrum shifts greatly. These results show that pulsed NMR and DMA have measured a flowability change of a macromolecule. (2) The relaxation spectrum of 40 µs or less shows that PS block exists as a hard phase near 100℃. From the result of DMA data, it became clear that the flow have taken place with the state where PS domains are formed,in the polymer with many SI diblock contents.
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Technical Report
  • Akinori NAKAJIMA, Makoto SAITO, Hideyuki HINO, Kenji NISHI, Yasuo SUZU ...
    2011 Volume 47 Issue 2 Pages 53-59
    Published: February 01, 2011
    Released on J-STAGE: June 30, 2014
    JOURNAL FREE ACCESS
    The adhesive connection between steel members has the merits of stress relaxation and damping during the vibration,while the bolted connection does not have. However,due to the variation in strength,the adhesive connection between steel members is not applicable to the steel structures so far.In this research,the fundamental static strength characteristics of the adhesive connection between steel members are investigated by conducting the component test such as the tensile test,the tensile shear test,and the bending and shear test. In this case,acrylic and epoxy adhesive are employed to connect the steel members and the single lap shear test and double lap shear test are conducted in tensile shear test.As a result,it can be found that the shear strength in the single lap shear test is smaller than the one in the double lap shear test and that the shear strength in the bending and shear test is far smaller than the one in the single lap shear test. This is the reason why the adhesive surface is subjected to the normal stress as well as the shear stress due to the bending of the steel plate in the single lap shear test and the bending and shear test.
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