Transactions of the American Electrochemical Society Volume 16
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...The diameter used in the calculations is the mean of several readings with micrometer calipers. The tests were made on a Riehle 10o, ooo-lb. power-driven machine. The load was applied very slowly and the beam kept in balance. The yield point was obtained with dividers, and was taken as that point at which a perceptible permanent stretch had taken place. This was checked by the drop of the beam. The summary of the results of these tests is given in the Tables I and II and in Plates I and II. The detailed data are not given, also no account is taken of bars which showed abnormal results, due to flaws, etc. The results enumerated are the yield point, the ultimate strength, the percentage of elongation in 2 inches and the percentage of reduction of area at fracture. In order to show the consistency of the data there is also given the maximum and minimum values for each of the above items, together with the average of these items for the number of samples enumerated in a separate column. The plates are plotted from the averages of the tables and it is not to be expected, considering the many variables which might arise, in tensile strength tests, that any series wHl give a simple curve. It is merely hoped to show the tendency of the increasing percentages of copper. The values of the yield point, ultimate strength, elongation and reduction of area are designed as points used in plotting the curves by the appropriate letters Y, U, E and R. Unannealed. From the curves of Table I, it will be noted that the rise in the ultimate strength and the elastic limit is almost a linear function of the percentage of copper. The ultimate strength increases from 61,180 lbs. per sq. in. at 0.1 per cent. copper to 132,400 lbs. at 7 per cent. The yield point..
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- 13 Sep 2013
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