311 生分解性ポリ乳酸の破壊特性の負荷速度依存性

概要

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PLA, poly (lactic acid), was molded under different conditions to fabricate PLA samples of different crystallized structures. Mode I fracture toughness was then evaluated at five different loading-rates using two kinds of testing systems. It is interesting to see that for the materials molded at 130℃, the fracture toughness dramatically increased as loading-rate increased up to (10)^3mm/min, and rapidly decreased at 1m/s. It should be noted that the toughness obtained at 1m/s was almost equivalent to that evaluated at 1mm/min. Microstructures of the molded samples and fracture surfaces created at different loading-rates were also observed using optical microscopes. Dependence of loading-rate and microstructure on the fracture toughness was discussed on the basis of those experimental results.
一般社団法人日本機械学会の論文
2002-09-20