Effects of material rate sensitivity and void nucleation on fracture initiation in a circumferentially cracked bar

Autor:	Brian Moran, C. F. Shih, R. J. Asaro
Rok vydání:	1991
Předmět:	Void (astronomy) Structural material Materials science Carbon steel Metals and Alloys Nucleation Fracture mechanics Strain rate engineering.material Condensed Matter Physics Fracture toughness Mechanics of Materials engineering Deformation (engineering) Composite material
Zdroj:	Metallurgical Transactions A. 22:161-170
ISSN:	2379-0180 0360-2133
DOI:	10.1007/bf03350958
Popis:	The influence of material strain rate sensitivity and void nucleation on crack tip stress and deformation fields has been evaluated for the case of a circumferentially cracked bar. Loading is assumed to occur at two very different rates which correspond to the quasi-static and high rate tests of Couqueet al.[1] A strain rate-dependent version of Gurson’s[2] porous-plastic constitutive theory is used which accounts for microvoid nucleation and for void growth by plastic deformation. A phenomenological fracture initiation criterion is used to model the onset of crack growth for the purpose of simulating the fracture toughness tests performed by Couqueet al. on a 1020 plain carbon steel. The computed results support the conclusions reached by Couqueet al. on relating fracture toughness values obtained at loading rates on the order ofKI = 1 MPa s−1 andKI = 106 MPa s−1.
Databáze:	OpenAIRE
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