Question: Problems for Chapter 5 5 . 1 An HDPE tensile bar yields at a nominal stress of 2 8 MPa at 8 % extension, beyond

Problems for Chapter 5
5.1 An HDPE tensile bar yields at a nominal stress of 28MPa at 8% extension, beyond which the stress falls to 22MPa as a neck forms. The neck stabilizes with a cross-sectional area equal to 26% of the original area. Sketch a graph of true stress against percentage elongation.
Problems for Chapter 5 5 . 1 An HDPE tensile bar

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