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.
Interface TYPE7 does not deal with edge to edge impact. The limitation of this interface during
the edge to edge contact is illustrated in Figure 1.
When the mesh is fine enough, edge to edge penetration is often followed by a node to shell
contact. The main problem with edge to edge impact is the locking situations. If
there is a change of load after edge penetration, locking is unavoidable since a
node to surface contact is detected (Figure 2). This usually leads to high penetration; therefore, the analysis
comes to a standstill as time step is reduced. If locking occurs, the use of
interface TYPE11 in this area is necessary to solve the problem.