TESTING TIRED METALS
It has been known for some time that metals are like human beings m getting tired ater prolonged exertion. A piece of metal, for instance, whifch is subject to constant vibration will gradually lose its strength, but will recover it again if it is allowed to remain quiet. Engineers, therefore, attach great importance, to what iB called the "fatigue testing" of metals. It is more important to know at what stage a piece of metal will become overtired and collapse than to know its hardness or its elasticity. The earliest forms of fatigue testing had the drawback that they took a considerable time and were therefore expensive. A British investigator has, however, devised a most ingenious apparatus by which the results of a fatigue test can be obtained m a few minutes instead of a week or two.
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Ashburton Guardian, Volume XLII, Issue 9373, 31 October 1921, Page 5
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141TESTING TIRED METALS Ashburton Guardian, Volume XLII, Issue 9373, 31 October 1921, Page 5
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