Here's some constructive criticism for the OP:
Stressing a METAL component to its yield point will result in plastic deformation, anything beyond that risks fracture.
So: NO, there is not a single magic component that will give you what you are asking for. What you are going to need is a complex system of springs & levers to indicate when the pivot is about to break.
Basically you are looking for a torque wrench.
Why does the handle have to be made from metal?
SHARPEN IT LIKE YOU LOVE IT, USE IT LIKE YOU HATE IT
Official plea to Sal: Can we PLEASE get a DLC Yojimbo 2? PLEASE!!?