ポリスチレン射出成形品における並走流ウェルドラインの破壊挙動 Fracture Behavior of Adjacent Flow Weldlines in Injection Molded Polystyrene Plates

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Although V-notches at weldlines in injection moldings are regarded as the causes of the reduction of mechanical properties and visual defects, few researchers have investigated the role of V-notches in the fracture behavior of weldlines. The fracture behavior of an adjacent flow weldline occurring behind an obstructive pin in injection-molded polystyrene plates was investigated by a fracture test which followed the technique of the double torsion test. The behavior of crack propagation was quite different between the upstream side and the downstream side of the weldline. There was a distinct boundary point between the sides. We defined the length of the upstream side as weldline length of fracture, <i>L<sub>wf</sub></i>. The crack propagated first in the sub-layer below the V-notch along the weldline and second inwardly from the sub-layer within <i>L<sub>wf</sub></i>. On the other hand, the crack at the sub-layer and that at the inward part propagated simultaneously in the area beyond <i>L<sub>wf</sub></i> similar to non-weld specimens. The fracture behavior had a close relationship to the V-notch shape. The V-notch depth showed little change within <i>L<sub>wf</sub></i>, while the depth decreased drastically in the area beyond <i>L<sub>wf</sub></i>. This relationship suggested that the difference of the fracture behavior was caused by the degree of molecular entanglement at the sub-layer below the V-notch.

収録刊行物

  • 成形加工

    成形加工 16(3), 197-203, 2004-03-20

    The Japan Society of Polymer Processing

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各種コード

  • NII論文ID(NAID)
    10012707364
  • NII書誌ID(NCID)
    AN10278882
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09154027
  • NDL 記事登録ID
    6896211
  • NDL 雑誌分類
    ZP17(科学技術--化学・化学工業--高分子化学・高分子化学工業--ゴム・プラスチックス)
  • NDL 請求記号
    Z17-1254
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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