Multi-leaf springs resist breaking thanks to rebound clips. Here’s why.
What are those bands that are around your leaf springs?
They are called rebound clips.
A leaf spring does not break when it is being compressed, it breaks when the load is suddenly released.
As the spring is being compressed with a load, each leaf is supported by the leaf below it.
When that load is suddenly released (like going over a bump) a leaf would not be supported by any other leaf if it were not for the rebound clip holding the group of leaves together.
Remember: a group of leaves are stronger than a single leaf.