Fracture properties of bioabsorbable HA/PLLA/PCL composite material

S. D. Park; M. Todo; K. Arakawa; H. Tsuji; Y. Takenoshita

doi:10.1117/12.621910

12 April 2005 Fracture properties of bioabsorbable HA/PLLA/PCL composite material

S. D. Park, M. Todo, K. Arakawa, H. Tsuji, Y. Takenoshita

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621910
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

Abstract

Hydroxyapatite particle filled poly(L-lactic acid)/poly(e-caprolactone) blend (HA/PLLA/PCL) composite materials were developed by melt-mixing, and their bending mechanical properties and fracture toughness were examined. It was found that the fracture absorbed energy and fracture toughness are maximized with the PCL content of 5wt%. Local plastic deformation of PLLA/PCL matrix is the main mechanism of energy dissipation during fracture. This ductile deformation is considered to be initiated in the surroundings of voids formed due to interfacial debonding at HA/matrix interfaces and phase separation of PLLA and PCL. On the other hand, fracture toughness of HA/PLLA/PCL with the PCL contents of 10 and 15wt% becomes lower than that of HA/PLLA. In these composites, void formation causes severe local stress concentration and therefore degrades the materials rather than improving the fracture resistance.

Citation Download Citation

S. D. Park, M. Todo, K. Arakawa, H. Tsuji, and Y. Takenoshita "Fracture properties of bioabsorbable HA/PLLA/PCL composite material", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621910

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