メタノールのＣａｓｅＩＩ拡散に伴うポリメチルメタクリレートの疲労破壊様式の脆性‐延性転移

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タイトル別名
  • Brittle-Ductile Transition in Fatigue Fracture of Poly(methyl methacrylate) Following Case II Diffusion of Methanol.
  • メタノール ノ Case 2 カクサン ニ トモナウ ポリメチルメタクリレート

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抄録

Fatigue tests of poly (methyl methacrylate) (PMMA) were conducted under methanol environment at room temperature using solid cylindrical specimens which had been presoaked in methanol for various periods. A fatigue lifetime 10000 times that of the specimen without presoaking was obtained for the specimens presoaked for periods ranging 8-96 h. Presoaking for longer periods provided a fatigue lifetime only 100 times that of the untreated specimen. Scanning electron micrographs revealed that numerous cracks with fibril structure at their tips, formed by shear deformation, are developed on the surface of each specimen, showing the dramatic increase in the fatigue lifetime. The vestiges of shear flow and shear cracking are seen on its fracture surface. These microscopic observations indicate that the dramatic increase in the fatigue lifetime by presoaking treatment is a transitional process in the fracture mode from brittle fracture dominated by crack (craze) opening to ductile fracture following shear flow. This is brought about by both the softening of PMMA and the generation of internal compressive stress in the surface layer due to case II diffusion of methanol.

収録刊行物

  • 高分子論文集

    高分子論文集 49 (12), 999-1003, 1992

    公益社団法人 高分子学会

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