title: Fracture modes under uniaxial compression in hydroxyapatite scaffolds fabricated by robocasting.
abstract: The fracture modes of hydroxyapatite (HA) scaffolds fabricated by direct-write assembly (robocasting) are analyzed in this work. Concentrated HA inks with suitable viscoelastic properties were developed to enable the fabrication of prototype structures consisting of a 3-D square mesh of interpenetrating rods. The fracture behavior of these model scaffolds under compressive stresses is determined from in situ uniaxial tests performed in two different directions: perpendicular to the rods and along one of the rod directions. The results are analyzed in terms of the stress field calculated by finite element modeling (FEM). This analysis provides valuable insight into the mechanical behavior of scaffolds for bone tissue engineering applications fabricated by robocasting.
authors.affiliation: Departamento de Electrónica e Ingeniería Electromecánica, Universidad de Extremadura, Avda de Elvas s/n. 06071 Badajoz, Spain. pmiranda@unex.es
authors.forename: Pedro
authors.initials: P
authors.lastname: Miranda
authors.forename: Antonia
authors.initials: A
authors.lastname: Pajares
authors.forename: Eduardo
authors.initials: E
authors.lastname: Saiz
authors.forename: Antoni P
authors.initials: AP
authors.lastname: Tomsia
authors.forename: Fernando
authors.initials: F
authors.lastname: Guiberteau
mesh_terms: D001672:Biocompatible Materials; D019245:Compressive Strength; D017886:Durapatite; D020342:Finite Element Analysis; D008962:Models, Theoretical; D013314:Stress, Mechanical
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite