LS-DYNA TUTORIAL 15: Shaft Torsion with Mass scaling, Ductile and Brittle Failure

Welcome back to another video in this series. So recently, I watched this video about understanding torsion by @The Efficient Engineer channel, in which I learned how the failure will occur in pure torsion. I decided to attempt to do a simulation and see if I can get the same failure pattern. If you are not interested in the set up of the FE model, you can just skip to the end of this video to see my results.

The torsion is applied on two geometrically identical shafts. The first one is made from Aluminum and the second is from Granite. The infamous Johnson Cook material model was used to describe the ductile behavior of the aluminum. While Johnson Holmoquist is used for the Granite (brittle material model).

In this video, I cover the following:
How to mesh cylindrical solid shaft
How to use MoveCopy command to create new part identities
How to constrain rigid bodies in rotational degree of freedom
How to apply rotational constraints on a rigid body
How to use MAT015_JOHSNSON_COOK material model for a solid part, including failure parameters
How to use MAT110_JOHSON_HOLMOQUIST material model for granite,
How to use mass-scaling explicitly by increasing the density of the material
How to scale up/down the size of your already meshed model|
The material properties are taken from:
- Murugesan, M., & Jung, D. W. (2019). Johnson cook material and failure model parameters estimation of AISI-1045 medium carbon steel for metal forming applications. Materials, 12(4), 609.
- Bal, B., Karaveli, K. K., Cetin, B., & Gumus, B. (2019). The Precise Determination of the Johnson–Cook Material and Damage Model Parameters and Mechanical Properties of an Aluminum 7068-T651 Alloy. Journal of Engineering Materials and Technology, 141(4).
- Shah, Q. H., & Hamdani, A. (2013). The damage of unconfined granite edge due to the impact of varying stiffness projectiles. International Journal of Impact Engineering, 59, 11-17.

Видео LS-DYNA TUTORIAL 15: Shaft Torsion with Mass scaling, Ductile and Brittle Failure канала Ameen Topa