Direct and inverse methods applied to the determination of mode I cohesive law of bovine cortical bone using the DCB test

Science & Technology Engenharia e Tecnologia::Engenharia Mecânica Bovine cortical bone mode I 0211 other engineering and technologies Cohesive law Double Cantilever Beam test 02 engineering and technology 0101 mathematics 16. Peace & justice 01 natural sciences
DOI: 10.1016/j.ijsolstr.2017.08.028 Publication Date: 2017-08-31T00:15:18Z
ABSTRACT
Abstract This work addresses the determination of the cohesive law under mode I loading of bovine cortical bone tissue using the Double Cantilever Beam (DCB) test. Direct and inverse methods were proposed to assess the cohesive laws representative of bone fracture under mode I loading. The direct method combines the evolution of the strain energy release rate under mode I loading with the crack tip opening displacement that is monitored by digital image correlation technique. According to this method, the cohesive law is obtained by differentiation of such relation with respect to the crack opening. The inverse procedure is performed through a finite element analysis including cohesive zone modelling, conjointly with a developed optimization algorithm. This identification strategy does not require a pre-established shape of the cohesive law as with the conventional inverse based procedures, which is viewed as a novelty of this work. It was concluded that both methods provide consistent results, being appellative tools concerning systematic and methodical studies dedicated to bone fracture characterization.
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