715 HA/PLLA複合材料のプレス加工による力学特性の改善(OS1-2 生分解性ポリ乳酸とポリ乳酸系複合材料の変形と破壊)

概要

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Press process was performed in order to toughen HA/PLLA bio-composite material. Mode I fracture properties and bending mechanical properties of presssed and unpressed HA/PLLA were then evaluated to assess the effect of press process on these properties. FE-SEM was also used to characterize the micro-structural change and toughening mechanism due to pressing. Testing results showed that the bending strength and modulus slightly increased due to pressing; on the other hand, the bending absorbed energy and the mode I fracture property dramatically improved. FE-SEM observation of the fracture surfaces showed that ductile deformation and fracture of PLLA fibrils were enhanced and in addition, interfacial cohesion strength was improved. These microstructural modifications appear to result in the dramatic toughness improvement.
一般社団法人日本機械学会の論文
2007-10-24