On the dynamic tensile strength of Zirconium

18th APS-SCCM; 24th AIRAPT

Appleby-Thomas, G.J.^1 ; Hameed, A.^1 ; Vignjevic, R.^2 ; Hazell, P.J.^3 ; Painter, J.^1 ; Cademartori, S.^4

Cranfield Defence and Security, Cranfield University, Shrivenham, Swindon

SN6 8LA, United Kingdom^1

Department of Applied Mechanics and Astronautics, School of Engineering, Cranfield University, Bedfordshire, Cranfield

MK43 0AL, United Kingdom^2

School of Engineering and Information Technology, UNSW Canberra, University of New South Wales, Northcott Drive, Canberra

ACT

2600, Australia^3

University of Genoa, Department of Physics, Chemistry and Industrial Chemistry, Via Dodecaneso 31/33, Genoa

16146, Italy^4

关键词: Complex materials;    Deformation control;    Dynamic behaviours;    Dynamic tensile;    Dynamic tensile strength;    Fcc materials;    Hcp Materials;    Impact stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112004/pdf
DOI  :  10.1088/1742-6596/500/11/112004

来源: IOP

【 摘 要 】

Despite its fundamental nature, the process of dynamic tensile failure (spall) is poorly understood. Spall initiation via cracks, voids, etc, before subsequent coalesce, is known to be highly microstructure-dependant. In particular, the availability of slip planes and other methods of plastic deformation controls the onset (or lack thereof) of spall. While studies have been undertaken into the spall response of BCC and FCC materials, less attention has paid to the spall response of highly anisotropic HCP materials. Here the dynamic behaviour of zirconium is investigated via plate-impact experiments, with the aim of building on an ongoing in-house body of work investigating these highly complex materials. In particular, in this paper the effect of impact stress on spall in a commercially sourced Zr rod is considered, with apparent strain-rate softening highlighted.