Abstract
We examine the performance of the node-based approximation with constant strain triangular (CST) finite elements employed in the nodal-integration finite element method (NI-FEM). First, the NI-FEM, which is characterized by the node-based approximation with CST FE mesh, is briefly reviewed and is extended by means of a penalty-based mesh connection technique at material interfaces. Then, we examine its performance against shear locking and volumetric locking problems with the increase of DOFs and the sensitivity of the approximation to the distortion of elements in comparison with the standard FEM. Also, the studies are made on the capabilities of reproducing the stress concentration at free surfaces and the displacement/traction continuity as well as the discontinuous strains at material interfaces in composite materials.
