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kalpakjian and schmid, problem 8.131. a 20-mm-diameter drill is being used on a drill press operating at 300 rpm. if the feed is 0.125 mm/rev, what is the material removal rate? what is the mrr if the drill diameter is tripled? 5 points

Sagot :

Remember that the original gage length of the specimen determines the percent elongation, which is defined by equation (2.6) on page 33.

Only the real and engineering necking strain as well as the true fracture strain may be determined. As a result, we are unable to determine the specimen's % elongation. We should also note that the elongation depends on gage length and increases with gage length. The starting and final gage lengths affect the specimen's % elongation. Regardless of the initial gage length, the specimen will uniformly (and permanently) lengthen as it is drawn until necking starts. The specimen will therefore always have a certain finite extension. However, take note that the contribution of localized elongation (also known as necking) will diminish as the specimen's gage length is raised.

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