On completion of this tutorial you should:

• Recognise the stress and strain tensors and the components into which they can be separated.
• Know how to diagonalise a stress tensor for plane stress, and recognise what a principal stress tensor is and why principal stress tensors are useful.
• Understand what a yield criterion is and how it can be used.
• Have an appreciation of different yield criteria and the materials for which they are appropriate.

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