Read e-book online Fatigue of Metals PDF

By P. G. Forrest (Auth.)

ISBN-10: 0080097294

ISBN-13: 9780080097299

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The addition of lead to steels to improve machinability may reduce the fatigue strength slightly, the reduction becoming greater with increase in tensile strength [103, 104]. For example, Woolman and Jaques [104] found that the addition of 0T5 to 0-2% lead reduced the fatigue strength by about 2 0 % for a 2 2 steel of 115 tons/in tensile strength, 5 - 1 0 % for a steel of 75 tons/in tensile 2 strength and had no significant effect on steels below 55 tons/in tensile strength. Austenitic stainless steels with high nickel and chromium contents show a distinct fatigue limit and an endurance ratio which is similar to that of other steels of the same tensile strength.

1 3 . General arrangement of the Haigh direct stress fatigue machine. ) The Amsler high frequency Vibrophore is also driven electromagnetically, but unlike the Haigh machine, it operates at the resonant frequency of the vibrating parts. These consist of the main moving mass 1 (see Fig. 14) which vibrates on the specimen 3 and dynamometer 4 connected in series. The output from the impulse generator 13, fixed between the specimen and dynamometer, is amplified and fed-back to the driving magnet 14, thus ensuring a vibration at the resonant frequency.

The specimen is supported between the loading face-plate and a loop dynamometer which is carried on a bridge (not shown in Fig. 12) that traverses the sides of the bed. The bridge can be adjusted by a screw, passing through a boss in the bed, to suit the length of the specimen. The machine is designed to operate slightly below the resonant frequency of the oscillating system. Close speed control is required, therefore, and this is achieved by an electronic relay controlled by an amplitude regulator fitted to the machine.

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Fatigue of Metals by P. G. Forrest (Auth.)


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