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Fracture mechanism of a cylindrical shell cut by circumferential detonation collision 被引量:3
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作者 He-yang Xu Wei-bing Li +4 位作者 Wen-bin Li Qing Zhang Ya-jun Wang Xiao-wen Hong Ying Yang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第5期1650-1659,共10页
The failure mechanism of a cylindrical shell cut into fragments by circumferential detonation collision was experimentally and numerically investigated.A self-designed detonation wave regulator was used to control the... The failure mechanism of a cylindrical shell cut into fragments by circumferential detonation collision was experimentally and numerically investigated.A self-designed detonation wave regulator was used to control the detonation and cut the shell.It was found that the self-designed regulator controlled the fragment shape.The macrostructure and micro-characteristics of fragments revealed that shear fracture was a prior mechanism,the shell fractured not only at the position of detonation collision,but the crack also penetrated the shell at the first contact position of the Chapmen-Jouguet(C-J)wave.The effects of groove number and outer layer thickness on the fracture behavior were tested by simulations.When the thickness of the outer layer was 5e18 mm,it has little effect on fragmentation of the shell,and shells all fractured at similar positions.The increase of the groove number reduced the fracture possibility of the first contact position of the C-J wave.When the groove number reached 7 with a 10 mm outer layer(1/4 model),the fracture only occurred at the position of detonation collision and the fragment width rebounded. 展开更多
关键词 Detonation wave Circumferential detonation collision Fracture mechanism fragmentation control
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Tadpole-shaped Au nano-particles fabricated by laser fragmentation of Au nano-spheres in liquid
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作者 张冲 马佳琪 +4 位作者 朱东东 刘良 王大猛 刘向东 陈明 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第8期63-66,共4页
Tadpole-shaped Au nano-particles with controllable tails are successfully fabricated by simply using laser fragmentation of separated Au nano-spheres in liquid. The optimum laser power densities(1.5–3 GW∕cm-2) can... Tadpole-shaped Au nano-particles with controllable tails are successfully fabricated by simply using laser fragmentation of separated Au nano-spheres in liquid. The optimum laser power densities(1.5–3 GW∕cm-2) can enable part of the individual Au nano-sphere to be re-melted, released, and ultra-rapidly recondensed/crystallized on the outside of the original region. We find that the length of the tail in a tadpole-shaped Au nano-particle significantly increases from about 10 to 25 nm by increasing the laser power density. Benefiting from the unique structural features, the localized surface plasmon resonance(LSPR) absorption spectra of the tadpole-shaped Au nano-particles become broader by increasing the tail length. Moreover, the LSPR absorption band also exhibits a noticeable red shift from about 520 to 650 nm. Our results provide a convenient and valuable strategy to fabricated novel anisotropic-shaped nano-structures with fascinating properties. 展开更多
关键词 shaped fragmentation spheres fascinating controllable anisotropic enable crystallized length fabrication
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