title: Hyper-elastic modeling and mechanical behavior investigation of porous poly-D-L-lactide/nano-hydroxyapatite scaffold material.
abstract: 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.
authors.affiliation: School of Chemical Machinery and Safety, Dalian University of Technology, Dalian 116012, Liaoning, China.
authors.forename: Quan Feng
authors.initials: QF
authors.lastname: Han
authors.affiliation: School of Chemical Machinery and Safety, Dalian University of Technology, Dalian 116012, Liaoning, China.
authors.forename: Ze Wu
authors.initials: ZW
authors.lastname: Wang
authors.affiliation: Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Chak Yin
authors.initials: CY
authors.lastname: Tang
authors.affiliation: Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Chi Pong
authors.initials: CP
authors.lastname: Tsui
authors.affiliation: Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Wing Cheung
authors.initials: WC
authors.lastname: Law
mesh_terms: D001672:Biocompatible Materials / Q000032:analysis*; D017886:Durapatite / Q000032:analysis*; D008422:Materials Testing; D049329:Nanostructures / Q000032:analysis*; D011091:Polyesters / Q000032:analysis*; D016062:Porosity; D054457:Tissue Scaffolds
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; C033616:poly(lactide); D017886:Durapatite
keywords: Compressible hyper-elastic; Constitutive Modeling; Mechanical properties; PDLLA/nano-HA composites