Hello!

I’m currently using create to simulate deformable objects and have some questions about this, someone can help me? thanks! ^__^

-What are the fundamental equilibrium equations implemented and solved by Create? Are they default Continuum Mechanics Cauchy-like equations? Do you have any references for those equations?

-What kind of solvers do you use? Explicit dynamic ones? Where can we find the formulation or even the references for the equations that have been implemented? Even just references to the names of the methods would help us.

-What kind of finite elements are implemented? First-order finite element shape functions? Is there any different FE implemented?

-How boundary conditions are applied? And how it relates to the different types of meshes?

-How does the constitutive/material behavior is implemented?

-What constitutive models are implemented? What nonlinear constitutive models are available? Can we select the ones that we want to use?

-What material laws are available (the one-dimensional relation between strains and stresses)? Can we tweak them? For instance, could we enter an experimental material strength curve?

-Where can we find the definition, with references to the actual equations, of each physics parameter of a deformable body?

-Is there any material or structural failure model implemented?

-On the UI there are basically two elastic/material parameters, the Young Modulus, and the Poisson. What does Create mean by elasticity damping and damping scale? If the constitutive models are nonlinear, there is a lack of additional phenomenological parameters to set up the equations. How does the simulation inherit the physical behavior?

-Why does the mesh refinement impact so much the physical behavior of the solid? The refinement does add additional degrees of freedom in the discrete models and enhances the kinematics of the FE model, but the impact is so big that it seems that the constitutive behavior is also influenced. In the end, it seems that the analyst needs to identify a trade-off between mesh refinement and material constants, which is not something usual. Not only that, even if one sets really high values for the elastic constants (i.e., an undeformable material), the deformation still would be expressive if the mesh is really fine. So, how does the implementation works underneath this behavior?

-Can we extract strains and stresses from the models? Would Create display a default FEA color map or even general state and dual variables values of the initial/boundary value problem

-Mass and damping seem to be major components in Create. There are some damping and mass parameters to be input by the user. We didn’t find technical information about those parameters. Do you have any reference for the general equilibrium equations and where those parameters are used in the formulation/implementation?

-What contact models are implemented? There is a dynamic friction parameter, so is the contact a frictional contact model? Is there any reference for the equations?