Abstract：Using the nonlinear finite element software LS-DYNA,a flange connection structure’s 3D finite element model was built. The nonlinear coupling among a flange disk,a bolt connection and a flange gasket was realized using the penalty function method. The pre-tightening force loading of bolt connection was realized using the temperature load method. The ALE multi- matter fluid-solid interaction algorithm was adopted to study the dynamic response characteristics of a flange structure under blast impact loads. The effects of shock wave’s incident angle,bolt connection’s pre-tightening force and flange gasket’s thickness on a flange connection structure’s dynamic features were studied considering flange gasket being alloy steel and rubber under the action of blast impact loads. The results showed that flange disk is the main energy-dissipation component; bolt connection is mainly affected by incident angle of shock wave; effects of shock wave’s incident angle on an alloy steel flange gasket are smaller; under the action of high pressure compression wave,the flange disk produces non-uniform compression deformations relative to bolt connection; a thicker flange gasket is not always better than a thinner one be,reducing properly flange gasket’s thickness can improve the anti-impact capacity of flange connection structures.
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