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# 3D dynamic simulation

## When to use equation of state models in modeling high velocity impacts?

Tue, 2019-04-16 10:48 - rctronEquation of state models (Mie-Gruneisen equation of state etc) have been widely used to study hydrodynamic response of material during explosive deformation, ballistic impacts for a long time. As far as I understand, a hydrodynamic response is required to be incorporated in a model if the pressure of impact leads to an increase volumetric strength. That is the stress wave speed in the material exceeds the speed of sound in the material (v = sqrt(elastic modulus/density)). Ballistic impacts occur at strain rates close to 10^9 to 10^12/s.

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## When to use equation of state models for modeling hydrodynamic response in metals?

Tue, 2019-04-16 10:45 - rctronEquation of state models (Mie-Gruneisen equation of state etc) have been widely used to study hydrodynamic response of material during explosive deformation, ballistic impacts for a long time. As far as I understand, a hydrodynamic response is required to be incorporated in a model if the pressure of impact leads to an increase volumetric strength. That is the stress wave speed in the material exceeds the speed of sound in the material (v = sqrt(elastic modulus/density)). Ballistic impacts occur at strain rates close to 10^9 to 10^12/s.

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## Professor/Associate Professor/Assistant Professor in Mechatronics with specialization in Mechanics - University of Agder, Norway

Mon, 2018-08-20 03:48 - Morten Kjeld Ebbesen## Export Mass Matrices in Abaqus

Wed, 2014-09-17 04:27 - augustusHello,

I have to export stiffness and mass matrices from Abaqus (dynamical simulation)

and I have been using the commands *Matrix Generate and *Matrix Output

I need to export the matrices for different instants of time (time intervals) and I have noticed that the entries

of the MASS matrices are not equal at different time points.

Is that correct or should the MASS matrices be constant for a dynamical simulation?

many thanks

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## Complicated rotor dynamic simulation with ANSYS/ABAQUS or Madyn 2000

Wed, 2009-07-29 10:44 - phamhuytuan

I have a system as in the Figure. There will have a radial load and a lateral load acting on the circumference of the drum which rotate at around 1000 rpm. I want to investigate the stability of the shaft at this speed. Can ANSYS or ABAQUS simulate this kind of dynamic simulation or is there any other software can solve my problem.

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