An explicit is solved by calculating results in small time increments or time steps. The size of the time step depends
on many factors but is automatically calculated by Radioss.
Composite materials consist of two or more materials combined each other. Most composites consist
of two materials, binder (matrix) and reinforcement. Reinforcements come in three forms, particulate,
discontinuous fiber, and continuous fiber.
When rupture is modeled and elements are expected to fail, it is important to deal with failed elements defined either
as a master segment, or as slave nodes.
Optimization in Radioss was introduced in version 13.0. It is implemented by invoking the optimization capabilities of
OptiStruct and simultaneously using the Radioss solver for analysis.
A tangential force can be generated when a penetrated node is sliding without friction. This
behavior is due to the gaps overlapping around the edges. Figure 1 illustrates that by the cylindrical gap around the edges, the force
is no longer normal to the shell mid-surface.
Note: No problems were observed in crash simulations, but in metal forming where
friction is very important this can seriously decrease the accuracy.
Comments
It is always advised to
post-process the contact forces. If they are too large, taking into account the
physical understanding, the model must be checked.
To post-process the forces
for symmetric contact, the interface can be split into four interfaces. For example,
for two parts A and B, you can create: