. Transactions. ve pieces, representing steels ofvarying hardness, were then tested slowly in tension and the stress-strain diagram plotted. Five similar pieces were also tested in an impactmachine with a recording device for drawing the stress-strain the ductility varied in the five specimens, it was hoped to find theeffect of this variation under static and dynamic loads. Description of Impact Machine A general view of the impact machine as arranged for this test isgiven in Fig. 2. The tup A, weighing 960 lb. (435 kg.), is connected to J. J. THOMAS AND J. H. NEAD 119 the crosshead
. Transactions. ve pieces, representing steels ofvarying hardness, were then tested slowly in tension and the stress-strain diagram plotted. Five similar pieces were also tested in an impactmachine with a recording device for drawing the stress-strain the ductility varied in the five specimens, it was hoped to find theeffect of this variation under static and dynamic loads. Description of Impact Machine A general view of the impact machine as arranged for this test isgiven in Fig. 2. The tup A, weighing 960 lb. (435 kg.), is connected to J. J. THOMAS AND J. H. NEAD 119 the crosshead B by the test specimen C. The test is made by raising thecrosshead and tup to the upper position and then releasing a hydraulicclutch K, causing the crosshead, tup, and test specimen to fall as oneunit. After falling ft. ( m.) the crosshead B strikes the stops Sbut the tup A continues to fall, due to its inertia, and the test specimen isbroken in tension by a suddenly apphed load. A pencil P attached to. Fig. 2.—General view of impact machine. the tup A describes a curve on a revolving drum D, the surface speed ofwhich is determined from a sine curve described by a small motor 3 shows the details of the recording mechanism. The pencilP is shown in contact with the drum D and the sine curve is shown faintlyat X. The weight A falls between the guides G, and when the pencil Pcomes into contact with the revolving drum D it describes a curveFig. 4 shows a side view of the recording apparatus. The motor Y 120 STATIC AND DYNAMIC TENSION TESTS ON NICKEL STEEL drives drum D; the curve described by the falUng weight is shownfaintly at Z. The time-recording motor M is operated as follows: At a certainpoint in the descent, a brass strip attached to the falHng weight makescontact with two other brass strips R, thus completing a circuit througha magnet placed just behind the end of a stj-lus attached to the shaft
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
