Recent content by compabaq

I'm modelling the debonding between two interfaces in a 3D model using a cohesive zone. When I was using Implicit, the CSMAXSCRT and CPRESS showed nice, regular behaviour. With this, I mean that the contours are more or less straight over the width of the interface. When I switched to Explicit...

I think that I have found the problem. I was using about a 1000 equally spaced points to define the softening curve. It seems that I needed to have more points towards the end of the softening curve. That region shows an exponential increase (if you plot the table you entered), and the only way...

Hi sandmonstersandy, I have been having the same problem, as my tabular cohesive law is also not breaking. The documentation on tabular cohesive laws is very poor. This is what I have understood and applied: - The damage variable is defined as 1-K/K0, with K0 the stiffness at initiation and the...

Thank you Mustaine3. I will give that a try. The disadvantage for my problem is that cast-iron plasticity only works for isotropic materials. My material is in principle anisotropic. Any ideas for anisotropic materials?

No one that can help me?

Hi guys, I would like to enter the entire stress-strain diagram of a plastic. This diagram is different in uniaxial compression and tension. I have the entire stress-strain diagram available for both, and I'm not worried about what happens in the other directions when the material yields. I do...

Dear Mustaine3, I have been able to implemented it, but it was not clear at all based on that section of the manual. It only mentions that it is implemented in the "General contact framework", but it leaves you to figure out how to implement this specifically. However, knowing this was enough...

I am trying to model a surface-to-surface contact in Abaqus/Explicit. When I add a contact property with "Cohesive Behaviour" and "Damage" defined, then I get the following error message: "The interaction "name" references a contact property (name) that contains the damage or cohesive behaviour...

I have not considered Explicit yet. Do you think this will lead to a more stable solution/convergence?

I am trying to model crack growth in a material using a cohesive interaction. It's basically two symmetric 3D halves that are being pulled apart in the normal direction with a cohesive zone in the symmetry plane. I want to monitor the crack growth as a function of the applied load. This works...

Thanks for the advice Mustaine3 and jmetzy34.

I was not using any mass scaling. In the meantime, I was able to resolve the issue by spreading the displacement over a large time. In my improved simulations, the kinetic energy is negligible compared to the internal energy (at most 1/1000). Are there any other energy-related checks that I...

This is what I did before I started using the smooth amplitude function. If you do this, then you create shock waves the moment you start and stop applying the constant velocity. This is normal, as you need to apply an infinite acceleration to get to your target velocity in an infinitely small...

I'm trying to model a dynamic process, but in the first step I need to start by pre-straining my model to a static equilibrium. I have attempted to achieve this equilibrium by applying the displacement in a very gradual way. I have done this using a smooth amplitude, spread over a relatively...