Damage accumulation mechanisms during dynamic compressive failure of boron carbide. Issue 13 (October 2022)

• Record Type: Journal Article
• Authors: Koch, Brendan M.L.; Li, Haoyang; Lo, Calvin; Ligda, Jonathan; Hogan, James David
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 13(2022)
• Page Start: 5522
• Page End: 5537
• Publication Date: 2022-10
• Subjects: Boron carbide -- Split Hopkinson pressure bar -- Digital image correlation -- Damage -- Strain-rate dependency; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.05.052
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: This paper explores the compressive response of two grades of boron carbide across a range of strain rates between 10 2 to 10 3 s −1 . Using ultra-high-speed photography to perform digital image correlation in conjunction with strain gauges, the evolution of apparent elastic moduli was tracked through the failure process. Analysis of damage metrics shows that the two most important measures of damage accumulation in these materials are apparent changes to shear modulus and Poisson's ratio, rather than only apparent changes to Young's modulus as is commonly assumed in the literature. For one grade of the boron carbide the range of strain-rates studied also included a transition from quasi-static-type failure behavior where bulking was not a significant factor, to dynamic-type failure where bulking became a significant influence on failure; this transition was linked to material-specific fracture mechanisms. For the other grade of boron carbide, only dynamic-type failure was seen in this strain-rate range, suggesting that the transition point was at a lower strain-rate.