ANSYS Explicit Dynamics-Introduction to Explicit Dynamics

“Implicit” and “Explicit” refer to two types of time integration
methods used to perform dynamic simulations
• Explicit time integration is more accurate and efficient for simulations
involving
– Shock wave propagation
– Large deformations and strains
– Non-linear material behavior
– Complex contact
– Fragmentation
– Non-linear buckling
• Typical applications
– Drop tests
– Impact and Penetration

Solution starts with a mesh having assigned material
properties, loads, constraints and initial conditions.
• Integration in time, produces motion at the mesh nodes
• Motion of the nodes produces deformation of the elements
• Element deformation results in a change in volume and density
of the material in each element
• Deformation rate is used to derive strain rates (using various
element formulations)
• Constitutive laws derive resultant stresses from strain rates
• Stresses are transformed back into nodal forces (using various
element formulations)
• External nodal forces are computed from boundary conditions,
loads and contact
• Total nodal forces are divided by nodal mass to produce nodal
accelerations
• Accelerations are integrated Explicitly in time to produce new
nodal velocities
• Nodal velocities are integrated Explicitly in time to produce new
nodal positions
• The solution process (Cycle) is repeated until the calculation
end time is reached

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