Characterization of shocked beryllium

18th APS-SCCM; 24th AIRAPT

Brown, E.N.^1 ; Cady, C.M.^1 ; Gray, G.T.^1 ; Hull, L.M.^1 ; Cooley, J.H.^1 ; Bronkhorst, C.A.^1 ; Addessio, F.L.^1

Los Alamos National Laboratory, Los Alamos

NM

87545, United States^1

关键词: Assembly features;    Circumferential cracks;    Failure behaviors;    Lagrangian code;    Post mortem;    Radial cracks;    Radial momentum;    Test samples;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112013/pdf
DOI  :  10.1088/1742-6596/500/11/112013

来源: IOP

【 摘 要 】

Explosively driven arrested beryllium experiments were performed with post mortem characterization to evaluate the failure behaviors. The test samples were encapsulated in an aluminum assembly that was large relative to the sample, and the assembly features both axial and radial momentum traps. The sample carrier was inserted from the explosively-loaded end and has features to lock the carrier to the surrounding cylinder using the induced plastic flow. Calculations with Lagrangian codes showed that the tensile stresses experienced by the Be sample were below the spall stress. Metallographic characterization of the arrested Be showed radial cracks present in the samples may have been caused by bending moments. Fractography showed the fractures propagated from the side of the sample closest to the explosives, the side with the highest tensile stress. There was evidence that the fractures may have propagated from the circumferential crack outward and downward radially.