Numerical simulation study on the effect of different mass flanges on strain growth of cylindrical shell

LS-DYNA software was used to establish the three-dimensional finite element simulation calculation model of cylindrical shell, and the effect of different mass flanges on the strain growth within the elastic response range of shell was analyzed and compared. The research found that: when the flange mass was changed, the radial and circumferential strain first peak value of shell basically did not change, while the axial first peak value changed greatly. The variation trend of strain growth response in radial direction and axial direction is basically the same, but the influence of axial strain growth is larger. Compared with the larger mass flange, the smaller mass flange may cause larger strain growth of the shell. Different flange mass only affects the time of strain growth and different frequency parts of excitation strain response, but hardly affects the appearance time of the "dangerous time domain". The longer the dangerous time domain is, the smaller the strain growth factor is. (paper)