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A cylindrical specimen of a metal alloy 47.8 mm long and 9.72 mm in diameter is...

A cylindrical specimen of a metal alloy 47.8 mm long and 9.72 mm in diameter is stressed in tension. A true stress of 399 MPa causes the specimen to plastically elongate to a length of 51.9 mm. If it is known that the strain-hardening exponent for this alloy is 0.3, calculate the true stress (in MPa) necessary to plastically elongate a specimen of this same material from a length of 47.8 mm to a length of 57.4 mm.

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