Simplified calculation method for pressure-impulse curve under blast load

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (13) : 224-232.

CHEN Jun-jie1, GAO Kang-hua1, Sun Ao2

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Abstract

Pressure-impulse (P-I) curves can be used to quickly assess damage effect of members under blast load. Based on motion equations of equivalent single-degree-of-freedom system and structural deformation of the elastic perfectly-plastic model, damping effect was considered in traditional energy method, and damping energy dissipation was calculated by using image method. The asymptote equations of quasi-static region and impulse region of P-I curves was obtained, and the fitting formulas for dynamic region of P-I curves were obtained through a large amount of calculation. The proposed simplified calculation formulas matched the P-I curves well, which were obtained by structural analysis of Newark method. The the rationality of the proposed method was verified. The calculation results show that the values of impulse asymptote and quasi-static asymptote decrease with the increase of ductility. The values of impulse asymptote and quasi-static asymptote increase with damping ratio, and damping ratio has obvious effect on impulse asymptote.

Key words

pressure-impulse curve / single-degree-of-freedom system / elastic perfectly-plastic model / damping effect / damage assessment

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CHEN Jun-jie1, GAO Kang-hua1, Sun Ao2. Simplified calculation method for pressure-impulse curve under blast load[J]. Journal of Vibration and Shock, 2016, 35(13): 224-232

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