01 January 1970 0 6K Report

For AA 6061-T4, In uniaxial tensile testing the "uniform elongation" or the strain at which the necking starts to occur is around 0.15. If I understand the forming limit curve (FLC) correctly, the leftmost major strain in FLC (i.e, the major strain at which necking starts to appear under uniaxial loading) must be 0.15 too. But that is not the case, It is always higher than the uniaxial fracture strain as its shown in attached images (i.e 0.3), What is causing this? Ain't the uniaxial loading path in FLC the same thing as uniaxial tensile testing?

I am refering to Article Aluminum Alloy Sheet-Forming Limit Curve Prediction Based on...

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