Evolution of voids in single-crystal iron under uniaxial, biaxial and triaxial loading conditions

ABSTRACT

We perform molecular dynamics simulations to investigate the void evolution dynamics in single-crystal iron deformed under uniaxial, biaxial and triaxial loading conditions. We find that the void density is highest for the triaxial case while it is lowest for the uniaxial case. The average void growth rate is highest for the uniaxial case while it is lowest for the triaxial case. The individual void volume fraction for the triaxial case evolves with many discrete jumps due to many coalescence events, while it evolves with few discrete jumps for the uniaxial case. For uniaxial and biaxial cases, the shape of the most dominant void is prolate while it is spherical for the triaxial case. The average void spacing of independent voids is highest for the uniaxial case where the void density is lowest, while it is lowest for the triaxial case where the void density is highest. The observations in the manuscript may be useful to develop frameworks for dynamic fracture models for closer comparison with the experiments.

KEYWORDS:

• Void evolution
• single crystals
• extreme strain rate
• molecular dynamics
• iron

Disclosure statement

No potential conflict of interest was reported by the authors.