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## Homework Statement

Given two wires of gauge length 100mm and 200mm

They are loaded to fracture in tension

The 100mm sample extends by 15mm

The 200mm sample extends by 25mm.

I need to use this information to

**calculate the nominal strain at which necking commences in the wires**

## Homework Equations

These are the relavent equations i can find in my notes relating to necking, stress/strain, true stress/strain

we are also told, the true stress/strain curve generally represented by,

where n is the work-hardening exponent

"necking" in a sample started when the value of the true strain is equal to the work hardening exponent, i.e.,

## The Attempt at a Solution

Im not so sure where to start with this as there are no forces given or areas. I assume we have to use the two sets of data to equated these terms and cancel them out.