1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Calculating Nominal strain at which Necking Occurs

  1. Jan 13, 2010 #1
    1. The problem statement, all variables and given/known data
    Given two wires of guage 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

    2. Relevant 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.,

    3. 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.
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted