NISA-COMPOSITE

NISA II/COMPOSITE is a powerful capability in the NISA II program for solving static, dynamic, and buckling problems for structures made of composite materials. The specification of fiber orientations for modeling curved surfaces is one of the outstanding features of the program. Three elements for modeling layered composite structures are: 3D layered composite shell, 3D layered sandwich shell, and 3D layered solid (overlay). There is no restriction on the number of layers or the lamination sequence. The thickness and the fiber angles can vary from node to node. The material properties can be temperature dependent and interlaminar stress calculation is supported. Failure theories included are: Maximum atress, Modified Hill-Mises, Tsai-Wu, adn R-factor.

The layered composite shell accounts for extensional-bending & bending-twisting coupling and transverse shear deformation. The sandwich shell allows multiple cores with more than two face sheets. The sandwich construction need not be symmetrical. The 3D solid element is assumed to be composed of several laminae: haveing variable thickness, different material properties or lamination angles.

Kant S. Kothawala, Ph.D.

President & CEO