Question
Asked Oct 28, 2019
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A tensile test specimen has a gage length = 3.0 in and
diameter 0.75 in. Yielding occurs at a load of 38,000 lb. The
corresponding gage length 3.01 03 in (neglect the 0.2 percent
yield point). The maximum load of 54,000 lb is reached at a gage
length 3.453 in. If the specimen necked down to a diameter
0.645 in, determine the percent reduction in area (round to the
nearest whole %).
40
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A tensile test specimen has a gage length = 3.0 in and diameter 0.75 in. Yielding occurs at a load of 38,000 lb. The corresponding gage length 3.01 03 in (neglect the 0.2 percent yield point). The maximum load of 54,000 lb is reached at a gage length 3.453 in. If the specimen necked down to a diameter 0.645 in, determine the percent reduction in area (round to the nearest whole %). 40

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Expert Answer

Step 1

The cross sectional area of the rod is,

Substitute the values,

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AD 4 A(0.75in) 4 0.442in2

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Step 2

The area of the specimen necked is,

Substitute the values,

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4 A =(0.645 in) 4 - 0.327 in

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Step 3

Find the percentage reduction of the spec...

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A-A -x100 A д% 0.442 in2-0.327in -х100 О% 0.442in2 -26.0%

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