Affiliation:
1. Rensselaer Polytechnic Institute Department of Mechanical Aerospace and Nuclear Engineering, , 110 8th Street, Troy, NY 12180
Abstract
Abstract
This article aims to investigate the characteristic microstructure-based failure mechanisms observed during the fracture cutting of age-varying bovine cortical bone. To this end, orthogonal cutting experiments are performed on cortical femoral bones harvested from three distinct bovine age groups, viz., young (∼1 month), mature (16–18 months), and old (∼30 months). Fracture cutting is induced at a depth of cut of 70 μm and a cutting velocity of 800 mm/min by using two distinct tool rake angles of +20 deg and 0 deg. The nanoindentation studies and porosity analysis show key differences between microstructural constituents, as a function of age. The high-speed camera images taken during the fracture cutting process provide insight into six dominant microstructure-specific failure mechanisms. These include primary osteonal fracture, woven fracture, and lamellar fracture observed in the plexiform region; and cement line fracture (i.e., osteon debonding), secondary osteonal fracture, and interstitial matrix fracture observed in the haversian regions. In addition to the conventionally reported specific cutting energy metric, a new metric of resultant cutting force per unit crack area and surface integrity are employed here. All cutting responses are seen to be sensitive to age-related microstructural variations and the tool rake angle. In addition to requiring more cutting force, the neutral tool rake angle also results in notable subsurface damage.
Funder
Division of Civil, Mechanical and Manufacturing Innovation
Rensselaer Polytechnic Institute
Subject
Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering
Cited by
2 articles.
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