•In this chapter, general tools and
procedures, not specific to a particular source of nonlinearity, but useful for
achieving convergence and post processing results are introduce:
A.Building
a Nonlinear Model
B.Analysis
Settings
C.Postprocessing
Nonlinear Results
D.Workshops
What is different about building a
nonlinear model vs. a linear model?
•In some
cases, there will be no
difference!
–A model undergoing mildly
nonlinear behavior due to large deflection and stress stiffening effects might
need no modification with regards to geometry set up and meshing.
•
•In other
cases, you must include special features:
–Elements with special
properties (such as contact elements)
•Covered in Chapter 3 & 4
–Nonlinear Material data
(such as plastic stress-strain data)
•Covered in Chapter 5 & 6
–Include geometric features
to overcome singularities that cause convergence trouble. (i.e. add radius to
sharp corner for example)
•
•You might
also need to give special attention to:
–Load and boundary condition
limitations under large deflection
–Mesh control considerations
under large deflection
Element
technology options under large deflection with nonlinear materials
•It is important to note the orientation of
loads and its effect on the structure in large-deflection analyses:
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