Engineering, Analysis and Design

Sunday, July 21, 2024

What is Explicit Dynamics in Ansys?

“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 behaviour – Complex contact – Fragmentation – Non-linear buckling. Typical applications are drop tests and impact and penetration. ANSYS Explicit Dynamics analysis software provides simulation technology to help simulate structural performance long before manufacture.

ANSYS explicit dynamics analysis software solutions are capable of solving short-duration, large-strain, large-deformation, fracture, complete material failure, and structural problems with complex contact interactions.


Some Examples

Baseball bat impact test

Non-linear deformation of CV joint boot

Crush test
Drop Test of a container filled with fluid

Methodology to perform Explicit Dynamics Simulations

A time integration method used in Explicit Dynamics analysis system. It is so named because the method calculates the response at the current time using explicit information Once the body is meshed properly, the next step is to define initial conditions or boundary conditions. At least one initial condition is required to complete the setup.

After defining the initial conditions (initial velocity, Angular velocity), the analysis setting has to be maintained as per the problem requirement. In the analysis setting, time steps have to be defined explicitly. The solution time depends on the time steps.

Time steps include;

  • Initial time step
  • Minimum time step
  • Maximum time step
  • Time step safety factor

In case of drop test the standard earth gravity is also taken into account

ANSYS Explicit Dynamics is included in the ANSYS Mechanical Enterprise-level license and is not available as a product by itself

  • It utilises the Autodyn solver within the standard ANSYS Mechanical interface to analyse transient structural events
  • It is used for simulating fracture, cutting, failure, buckling, impact, drop as well as highly nonlinear quasi-static simulations that the implicit APDL-based solvers would struggle to converge
  • Users with an Autodyn level license have access to the Explicit Dynamics interface in Mechanical as a method to preprocess their structural geometry

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