Mechanisms of large strain, high strain rate plastic flow in the explosively driven collapse of Ni-Al laminate cylinders

18th APS-SCCM; 24th AIRAPT

Olney, K.L.^1 ; Chiu, P.H.^2 ; Higgins, A.^3 ; Serge, M.^3 ; Weihs, T.P.^4 ; Fritz, G.^4 ; Stover, A.^4 ; Benson, D.J.^5 ; Nesterenko, V.F.^2

Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego

CA

92027, United States^1

Materials Science and Engineering Program, University of California, San Diego, San Diego

CA

92027, United States^2

Department of Mechanical Engineering, McGill University, Montreal

QC

H3A 2K6, Canada^3

Materials Science and Engineering, Johns Hopkins University, Baltimore

MD

21218, United States^4

Department of Structural Engineering, University of California, San Diego, San Diego

CA

92027, United States^5

关键词: Dynamic behaviours;    Finite element simulations;    High strain rates;    Ignition methods;    Intermetallic reaction;    Mechanical loading;    Reactive materials;    Thick walled cylinders;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/13/132002/pdf
DOI  :  10.1088/1742-6596/500/13/132002

来源: IOP

【 摘 要 】

Ni-Al laminates have shown promise as reactive materials due to their high energy release through intermetallic reaction. In addition to the traditional ignition methods, the reaction may be initiated in hot spots that can be created during mechanical loading. The explosively driven thick walled cylinder (TWC) technique was performed on two Ni-Al laminates composed of thin foil layers with different mesostructues: concentric and corrugated. These experiments were conducted to examine how these materials accommodate large plastic strain under high strain rates. Finite element simulations of these specimens with mesostuctures digitized from the experimental samples were conducted to provide insight into the mesoscale mechanisms of plastic flow. The dependence of dynamic behaviour on mesostructure may be used to tailor the hot spot formation and therefore the reactivity of the material system.