Explicit Dynamic Finite Element Method for Failure with Smooth Fracture Energy Dissipations

Abstract EN

A numerical method for dynamic failure analysis through the phantom node method is further developed.

A distinct feature of this method is the use of the phantom nodes with a newly developed correction force scheme.

Through this improved approach, fracture energy can be smoothly dissipated during dynamic failure processes without emanating noisy artifact stress waves.

This method is implemented to the standard 4-node quadrilateral finite element; a single quadrature rule is employed with an hourglass control scheme in order to decrease computational cost and circumvent difficulties associated with the subdomain integration schemes for cracked elements.

The effectiveness and robustness of this method are demonstrated with several numerical examples.

In these examples, we showed the effectiveness of the described correction force scheme along with the applicability of this method to an interesting class of structural dynamic failure problems.