NISA Composite
NISA II/COMPOSITES is an integrated part of the general purpose
finite element program NISA II. The elements of NISA
II/COMPOSITES can be used with all the elements of NISA -
including isotropic (or orthotropic) shells, solids, beams, spars,
mass, and spring elements and thus complete analysis capability is
available for all composite and hybrid structures.
The NISA/COMPOSITE element library includes: These
elements have no restriction on the number of layers, and each
layer may have different thickness, orientation angle and material
properties. The lamination may be symmetric or unsymmetric. For
shell elements, transverse (interlaminar) shear deformation and
`bending extensional' coupling are included.
THREE-DIMENSIONAL LAYERED COMPOSITE SHELL - The
element is composed of several layers of orthotropic materials with
varying thicknesses and material properties. The Tsai-Wu and Hill-
Mises failure theories are available for these elements.
THREE-DIMENSIONAL SANDWICH SHELL - In sandwich
composite elements, the face sheets are thin which resist
extensional and inplane shear deformation and a thick
corematerial which resists transverse shear. The face sheets
themselves can be made of laminated composites and the core
may be orthotropic. Multiple cores of more than two face sheets are
allowed and the sandwich construction need not be symmetrical.
THREE-DIMENSIONAL COMPOSITE SOLID (OVERLAY)
ELEMENT - In this element, solid is assumed to be composed of
several lamina, each lamina may have different material properties
and lamination angles. Each group of lamina is considered as a
solid element. The normal stress and interlaminar shear stress are
most accurately determined at any desired location. The element is
capable of predicting displacement and stress variations, including
edge effects accurately.
Highlights of the Element Library
- Consistent or lumped mass formulations for dynamic analysis
- Deformation dependent concentrated force and follower
pressure for non-linear analysis.
- Material nonlinearity with elastoplastic material model
- Specified nodal temperatures with temperature gradients
through thickness.
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