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29 December, 20:00

2. Annealed low-carbon steel has a flow curve with strength coefficient of 75000 psi and strain-hardening exponent of 0.25. A tensile test specimen with a gauge length of 2 in. is stretched to a length of 3.3 in. Determine the flow stress and the average flow stress that the metal experienced during this deformation.

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  1. 29 December, 22:41
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    Flow stress = 9390Psi

    Average flow stress = 4173.33Psi

    Explanation:

    Given:

    Strength Coefficient = 75000psi

    Strain hardening Exponent = 0.25

    Gauge length = 2inches

    Stretch length = 3.3 inches

    Flow stress, Yf = 75000 * ln (3.3/2) * 0.25

    Yf = 75000 * ln (1.65) * 0.25

    Yf = 75000 * 0.5008 * 0.25

    Flow stress = 9390Psi

    Average flow stress = 75000 * 0.5008 * (0.25/2.25)

    Average flow stress = 4173.33psi
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