Dispersion and attenuation effects on stress waves of cylindrical shell in defense layer

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (12) : 195-200.

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Dispersion and attenuation effects on stress waves of cylindrical shell in defense layer

Gao Guang-fa1,2; Li Yong-chi2; Zhao Kai2; Pang You-chao3

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Abstract

Aimed at anti-explosion design in defense engineering, attenuation mechanism and evolution law of stress waves in defense layer which cavities or cylindrical shells were embedded in were focused on. Based on theoretical analysis and numerical simulations, it was found that dispersion and diffraction effect of stress waves were occurred in the concrete material, which significantly weakened the strength of stress waves behind the cavity or shell, and the structure embedding shell has better protection than the structure embedding cavity. Numerical calculations for different radius of the shells were preformed. The results show: the protect effect and scope is amplified as the radius of the shells are increased; and when several shells were horizontally equispacedly arranged in defense layer, the stress peaks of the measure points are obviously less than the minimum of stress peaks of corresponding measure points in the structure that single cylindrical shell was embedded in. all those can be referred to design of advanced defense layer in anti-explosion engineering.

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anti-explosion design / mechanics of explosion / cylindrical shell / defense layer / stress waves

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Gao Guang-fa; Li Yong-chi; Zhao Kai; Pang You-chao. Dispersion and attenuation effects on stress waves of cylindrical shell in defense layer[J]. Journal of Vibration and Shock, 2011, 30(12): 195-200