Deformation of beam structures in an internal explosion

Abstract

Abstract The paper considers the deformation of a hinged beam exposed to the action of an explosive load at the initial stage of an internal explosion, when the excess pressure increases according to the third degree of time. With this law of load change, the rate of its increases all the time, which leads to an increase in dynamism. Analytical expressions are obtained for the deformation value and its velocity, both at the growth stage and at the pressure drop. The case of transition of elastic deformation to plastic deformation both at the stage of load growth and decline is considered. The decline was approximated by a linear function of the start time of the decline. Calculations have shown that the deformation rate increases significantly towards the end of the lifting stage. If plastic deformation occurs at the stage of lifting close to its end, the coefficient of plasticity is close to 10 or more. If plastic deformation occurs at the stage of decline, the coefficient of plasticity varies between 1.4÷2.