Implementation of a Shell Element with Pressure and Void Effects Into DYSMAS

A shell formulation was developed from a three-dimensional solid. Tile shell element has four comer nodes at which there are three displacements and three rotations as nodal degrees of freedom, and includes both transverse shear and transverse normal deformations. Tile element utilizes reduced integration along the in-plane axes and fill integration along the transverse axis. Tile formulation incorporates the Gurson constitutive model for void growth and plastic deformation. An algorithm for stable solutions of the nonlinear constitutive equations is also developed. Hourglass mode control is provided by adding a small fraction of internal force determined through fill integration along the in-plane axes and reduced integration along the transverse axis. Implementation into both a specialized research finite element program and DYSMAS, a derivative of DYNA3D, is discussed. Numerical examples are provided to verify the accuracy of the new element and to show the importance of the transverse normal stress, void effects on plastic strain, and the necessity of applying a drilling moment.Naval Postgraduate School Monterey CA is the author of 'Implementation of a Shell Element with Pressure and Void Effects Into DYSMAS' with ISBN 9781423541820 and ISBN 1423541820.