Pendulum Impact Testing: A Century of Progress (ASTM Special by Michael P. Monahan (Editor) Thomas A. Siewert (Editor)

By Michael P. Monahan (Editor) Thomas A. Siewert (Editor)

This particular quantity examines 23 peer-reviewed papers that symbolize the newest all over the world expertise in pendulum influence trying out. Written by way of 50 U.S. and overseas specialists of their box, those papers are equipped into four sections: • history of effect trying out • Reference Energies, computing device balance, and Calibration • effect try tactics • Fracture longevity evaluation from impression try out info STP 1380 marks the a hundred yr anniversary of the discovery of the pendulum effect try out through S. Bent Russell, and the study and standardization efforts of G. Charpy throughout the early a part of the 20 th century. As an extra bonus, reprints of 2 landmark papers written via Russell and Charpy are incorporated during this quantity, describing the advance of the try gear and tactics.

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Extra resources for Pendulum Impact Testing: A Century of Progress (ASTM Special Technical Publication, 1380)

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All dimensions are in inches. Then, by computation, when 103 is the weight of the hammer in pounds, the resilience in inch-pounds per cubic inch of the material, or 103 [ F - (S + C1)] Rl = Lhb Table 19 shows a series of observations just as they were recorded by the observer, and extended in the office. The resilience by gradual load was obtained by breaking the bar in a standard testing machine and accurately measuring the deflections up to the point of rupture. The resilience was then taken as half the product of the load by the maximum deflection.

All bars 2 ins. • 1/4 in. 6 Ibs. 25 By Gradual Load Resilience, in inch-pounds per square inch of section at nick R2 Number of tests made 4 4 . 4 2 115 1 625 . . 1 913 Resilience, in inch-pounds per square inch of section at nick R2 Number of tests made 4 3 1 . 1 527 1 133 1 460 . . NOTE--All from lot No. 1. Ultimate tensile strength, 83 720 lbs. 3% in 75/8 ins. -lbs, per cubic inch, gradual load. " " " " " " " Nickel " Fluid comp. steel Cast Steel " " " 6 6 1 1 2 2 6 6 6 Iron, Norway " Tenn.

Each value given is the average of several tests. In making the impact tests, the following values are obtained by observations: F S C1 L h = = = = = the the the the the initial fall of the hammer in inches. rise after the blow in inches. correction for friction. distance between supports. depth of beam. TABLE 1--Resilience by impact and by gradual load. Cast-iron bars 1 in. , broken flatwise. By Impact Lot or Melt Nos. 1 2 3 4 6 7 Averages By Gradual Load Experiment Nos. 03 ... . . . * L = 24 ins.

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