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论文类型：期刊论文

发表时间：2017-07-01

发表刊物：JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：71

页面范围：262-270

ISSN号：1751-6161

关键字：PDLLA/nano-HA composites; Mechanical properties; Compressible hyper-elastic; Constitutive Modeling

摘要：Poly-D-L-lactide/nano-hydroxyapatite (PDLLA/nano-HA) can be used as the biological scaffold material in bone tissue engineering as it can be readily made into a porous composite material with excellent performance. However, constitutive modeling for the mechanical response of porous PDLLA/nano-HA under various stress conditions has been very limited so far. In this work, four types of fundamental compressible hyper-elastic constitutive models were introduced for constitutive modeling and investigation of mechanical behaviors of porous PDLLA/nano-HA. Moreover, the unitary expressions of Cauchy stress tensor have been derived for the PDLLA/nano-HA under uniaxial compression (or stretch), biaxial compression (or stretch), pure shear and simple shear load by using the theory of continuum mechanics. The theoretical results determined from the approach based on the Ogden compressible hyper-elastic constitutive model were in good agreement with the experimental data from the uniaxial compression tests. Furthermore, this approach can also be used to predict the mechanical behaviors of the porous PDLLA/nano-HA material under the biaxial compression (or stretch), pure shear and simple shear.