Journal of Materials Life Society
Online ISSN : 2185-7016
Print ISSN : 1346-0633
ISSN-L : 1346-0633
Volume 13 , Issue 3
Showing 1-8 articles out of 8 articles from the selected issue
  • Shin-ichi KURODA
    2001 Volume 13 Issue 3 Pages 97-98
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Rikio YOKOTA
    2001 Volume 13 Issue 3 Pages 99-104
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Yasushi UMEDA, Norio SAKAI, Tetsuo TOMIYAMA
    2001 Volume 13 Issue 3 Pages 105-109
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
    Stimulated by the global environmental issues, needs for a new manufacturing paradigm areincreasing. Such a new manufacturing paradigm should drastically reduce materials and energyconsumptions, while maintaining quality of life, product quality, and corporate profits. To investigate the feasibility of such a manufacturing paradigm, life cycle design is an indispensable tool.This article overviews the concepts of “life cycle simulation (LCS) systems”that are currentlydeveloped by various researchers. Case studies using the LCS system illustrate the possibility ofproduct life cycles that can reduce environmental loads while keeping corporate profits. LCS is alsouseful to consider product architecture as well as business strategies.
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  • Hiroshi MITOMO
    2001 Volume 13 Issue 3 Pages 110-113
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Kozi ASADA
    2001 Volume 13 Issue 3 Pages 114-122
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • [in Japanese]
    2001 Volume 13 Issue 3 Pages 123
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Toshio FUKUSHIMA
    2001 Volume 13 Issue 3 Pages 124-132
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
    Physical service life of steel reinforced concrete (RC) components and buildings in the ordinary atmospheric surroundings is reasonably determined by the time when the occurrence of crack and spalling of cover concrete makes serious damage to the daily safety as the results of the progress of neutralization of concrete and the accompanying corrosion of reinforcing steel. If we make effective use of polymeric coating materials, however, the physical service life can be prolonged by their suppressive effects against the progress of neutralization and corrosion. I propose the rational setting methods of physical service life of reinforced concrete treated with polymeric coating materials based upon the concept of equivalent thickness of cover concrete and also equivalent corrosion loss of crack occurrence.
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  • Yasunori SAKTHATA, Masanori HANSAKA, Takao YOSHIKAWA, Naoto MIFUNE
    2001 Volume 13 Issue 3 Pages 133-140
    Published: July 31, 2001
    Released: April 19, 2011
    JOURNALS FREE ACCESS
    As the needs for eco-materials increase, it is essential to study and improve the thermoplastic elastomer because it is a representative recycle material. In order to make clear the practical recycle properties of the styrene type thermoplastic elastomer (TPS) substantially, we studied the changes in the material properties of TPS after it is aged thermally and repeatedly recycled without mixing any virgin component and additive. As a result, the following properties have been revealed. After the first and second thermal aging processes, the strength of TPS increases a little because molecular chains are distributed to fill sparse and weak parts. After the first recycle process, molecular chains restore. After the second recycle process, however, the binding strength of styrene molecular is clearly weakened. Moreover, oxidation-degradation progresses gradually in each thermal aging and recycle process, and the strength of TPS begins to decrease after the third aging process. Keywords Thermdplastic elastomer, Recycle, Styrene block, Etyhlene/butyhlene block
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