Aiming at problems of damage mode of discharge hole membrane structure caused by high energy blast gas of high pressure vessel being unable to predict accurately and effectively and existing dangerous cases of membrane early breaking and non-membrane breaking, the macro and micro damage characteristics of Q235 steel structure membranes with pre-fabricated damage hole under blast impact load were studied.Based on high-pressure blast device, a series of tests were conducted for the anti-blast damage effect of membranes above mentioned.Combining with test results, quantitative relations among seven-hole gunpowder blast impact load energy release behavior and relevant parameters were explored to provide the theoretical basis for studying membrane damage mechanism, and establish the relation between membrane damaged hole size and peak pressure of blast impact load.Finally, based on the dynamic constitutive relation and failure criterion of J-C model, the membrane failure mode was simulated numerically.The results showed that with increase in blast impact load pressure, membranes with prefabricated hole mainly reveal macro-damage modes, such as, uniform damage holes, edge stress concentration tearing and shear plug; the built energy release relations and the inner correlation between damaged hole size and peak pressure of blast impact load provide a quantitative basis for studying multi-scale damage mechanism; membrane failure forms and damaged hole size obtained with numerical simulation agree well with test results.
Key words
impact /
high pressure vessel /
damage mode /
shear plug
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