Fracture behavior of Alumina-Tricalcium phosphate-Titania composites for bone tissue reconstruction. (1st October 2021)

• Record Type: Journal Article
• Authors: Barkallah, Rachida; Taktak, Rym; Yan, Zhu; Zaïri, Fahmi; Guermazi, Noamen; Bouaziz, Jamel; Zaïri, Fahed
• Is Part Of: Engineering fracture mechanics. Volume 255(2021)
• Publication Date: 2021-10-01
• Subjects: Bioceramic composites -- Structure-property relationship -- Stress intensity factor -- Opening/shearing modes; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2021.107959
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Crack resistance of biocomposites with different Al2 O3 -TCP-TiO2 configurations. Pure shearing effects identified using an anisotropic damage model. Toughening mechanism correlated to microstructure observations. Abstract: In the present work, the fracture behavior of bioceramic composites for bone tissue reconstruction is evaluated under opening/shearing modes using an approach combining experiments and numerical computations. Different microstructure configurations of the biomaterials are examined in the aim to improve the crack resistance by considering as constituents commercial Alumina (Al2 O3 ), synthesized Tricalcium phosphate (β-TCP) and commercial Titania powder (TiO2 ). The effects of TCP and TiO2 additives on the fracture toughness of Al2 O3 -TCP-TiO2 composites are studied using Cracked Straight Through Brazilian Disc specimens. An anisotropic stress-based damage model, implemented into a finite element program, is used to compute the patterns of the two competitive damage modes and to identify the loading angle resulting in pure shearing mode effects in the bioceramics. The implication of additives in the crack resistance improvement of Al2 O3 -TCP-TiO2 composites is then highlighted under both opening mode and shearing mode. The toughening mechanism of optimal Al2 O3 -TCP-TiO2 composites is further analyzed by X-ray diffraction and Scanning Electron Microscopy.