Fatigue-Fracture Surface of Polycarbonate Subjected to Heating/Cooling Cycles under Longitudinal Confinement

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  • TANAHASHI Mitsuru
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • KOHSAKA Noriaki
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • MORI Masao
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • HATAO Takuya
    Evaluation Technology Research Department, Information and Telecommunication Material Laboratories, Sumitomo Bakelite Co., Ltd.
  • KATSUMURA Akifumi
    Circuitry Materials Research Laboratory, Advanced Reactive Polymers R&D Center, Sumitomo Bakelite Co., Ltd.
  • TAKEDA Kunihiko
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

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Other Title
  • 拘束下での加熱冷却によるポリカーボネートの疲労破面の形態変化
  • コウソク カ デ ノ カネツ レイキャク ニ ヨル ポリカーボネート ノ ヒロウ ハメン ノ ケイタイ ヘンカ

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Abstract

A specimen of bisphenol-A-type polycarbonate (BPA-PC) was firmly held between two copper plates with coefficients of thermal expansion different from that of BPA-PC and subjected to thermal cycles in the temperature ranges of 233 K to 363 K and 218 K to 398 K. The fatigue-fracture surfaces were examined by scanning electron microscopy. The relation among the internal strain of the specimens, temperature range, and fatigue-fracture surface was investigated. The regular and clear wavelike pattern observed on the fracture surface was similar to those of metals, such as steel and aluminum, but it characteristically had two kinds of patterns, i.e., widely and narrowly spaced waves. The number of the patterns was proportional to the thermal cycles. The fracture surface was influenced by the temperature range of the thermal cycle. The width of the crack propagation occurring in the wider temperature range was 5 times as large as that occurring in the narrower temperature range. Polymer chain relaxation did not play an important role in the fatigue phenomena observed in the BPA-PC subject to thermal cycles.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 63 (12), 767-773, 2006

    The Society of Polymer Science, Japan

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