Calculate Proportional Limit of Alloy Bar

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To calculate the proportional limit of an alloy bar, one must use the stress-strain relationship derived from the given load and dimensions. The proportional limit is determined by identifying the maximum stress that the material can withstand while still exhibiting linear elastic behavior. The user successfully calculated the modulus of elasticity and Poisson's ratio before seeking clarification on the proportional limit. After some discussion, the user resolved their query independently. Understanding the relationship between stress, strain, and material properties is crucial for accurate calculations.
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I am given the length, elongated length, original diameter and reduced diameter of a alloy bar, and the load carried. I need to calculate the mod of elasticity, poisson's ratio and the proportional limit for the material. Got the first 2, how do I calculate the proportional limit? My book it quite vague, as if its obvious, which I'm sure that it is but I missed it, can anyone tell me what i need to do? Thanks
 
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nevermind, I got it
 

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