20403 低温下で動的負荷を受ける高分子材料の強度評価(実験力学的手法による生体・材料・製品の評価(1),OS.7 実験力学的手法による生体・材料・製品の評価)

概要

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High polymer materials are used in the various fields, they will be expected to increase usage of severe load and temperature conditions in the future. Therefore, to expand the range of use of high polymer materials further, it is necessary to understand the fracture characteristic by the temperature dependence. In this study, the specimens are three kinds of high polymer materials, polycarbonate and polyethylene-terephthalate, polymethyl-methacrylate. The crack model assumed V notch. The experiment temperatures were assumed to be a room temperature, 0, -10, -20, -30 and -40℃. The dynamic stress intensity factor was determined by using caustics method and impact three-point bending test. The strength of materials in low temperature was evaluated by calculating the dynamic stress intensity factor. As a result, with the drop of temperature, the maximum value of the dynamic stress intensity factor showed the tendency to reduce in all the materials.
2009-03-05