Question

fea

b) List the four material properties needed to perform a FE analysis using a bilinear material. c) Describe the boundary conditions needed to impose a symmetry plane when using shell elements.

Answer 1

b) the basic material needed to be known for accurate finite element analysis are ;

• youngs modulus of elasticity and yield strength
• bulk and shear modulus
• poisson's ratio
• density

c) the symmetry boundary condition defines a mirror face/surface .it should only be used if the physical object or geometry and the expected flow field pattern of the developed solution are mirrored along that surface.    By taking advantage of symmetry or anti-symmetry,the size of the analysis domain can be reduced,at least by a factor of two.the reduction in analysis domain could mean the difference between keeping the analysis in core,and swapping in and out of memory during the analysis,or a finer mesh can be used in the reduced analysis domain resulting in a more accurate analysis than a coarsely meshed full model with a comparable node and element count .the boundary conditions are the places where the structure interacts with the environment either through the application of an external force or through some restraint that is imposing a displacement.