Hill and BBC Yield Criterion, Hardening Models

[djbenny1]

Sorry - I didn't post according to the template as even though this is a homework/coursework question; it's not as black and white as a question and answer!


I am doing a piece of coursework, or research if you like, for university. The purpose of it is to investigate how the results of FEA models vary from ACTUAL strain test results.

As a part of this I have to use different Yield Criterion (Hill 48 and BBC 2005) as well as different Hardening Models (Ludwik, Swift, Ghosh, Hockett-Sherby and Combined Hocket-Sherby).

I'm just not really sure what these are and how they are different to one another.

I'm kind of lost in translation and I was hoping someone here could help me understand.

This is probably very vague, but being as confused as I am, its hard for me to even ask the question properly so if you need any more information please ask!

Thanks

 

[KataKoniK]

Dear student,

Thank you for reaching out for help with your coursework. It's great that you are conducting research and investigating FEA models and their correlation with actual strain test results.

To begin, Yield Criterion refers to the mathematical equations used to determine when a material will start to deform plastically, meaning it will permanently change shape when subjected to stress. This is important to understand because it affects the accuracy of FEA models. Hill 48 and BBC 2005 are two different yield criteria that are commonly used in FEA simulations.

On the other hand, Hardening Models refer to the mathematical equations used to describe how a material's strength and stiffness change as it is deformed. Ludwik, Swift, Ghosh, Hockett-Sherby, and Combined Hockett-Sherby are all different hardening models that are used to describe different types of material behavior.

The reason there are different yield criteria and hardening models is because different materials behave differently under stress. For example, a soft material like rubber will have a different yield criterion and hardening model compared to a hard material like steel. Additionally, different manufacturing processes can also affect the material's behavior, which is why it's important to consider different yield criteria and hardening models in FEA simulations.

I hope this helps to clarify the concepts of yield criteria and hardening models for you. If you have any further questions or need more information, please don't hesitate to ask. Best of luck with your research!