Temperature Coefficient of the Moduli of Metals and Alloys Used as Elastic Elements (Classic Reprint) - Softcover

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Excerpt from Temperature Coefficient of the Moduli of Metals and Alloys Used as Elastic Elements

Brombacher and. Me1ton used a torsion pendulum to determine the temperature coefficient of the modulus of rigidity and the effect of stress and heat treatment 011 both the modulus and the temperature coefficient. This method has serious disadvantages. In selecting a more suitable experimental method consideration was given to the practical necessity of obtaining temperature control by means of a liquid bath and to the desirable possibility of obtaining the data on both moduli from the same specimen of a given material. This led to the use of helical spring specimens. Two springs of the given mate rial and of the same design were coupled together and (a) stressed in tension to obtain the temperature coefficient of the rigidity modulus and (b) stressed in twist to obtain the temperature coefficient of Young' 8 modulus of elasticity. While under each type of stress the change 111 the deformation of the springs of the coupled system was measured as the temperature of one of the springs was varied while that of the other spring was maintained constant. The use of two springs was necessary to eliminate lateral vibration and to a large extent the effect of elastic afterworking or drift. If the two springs were exactly alike the drift would not change the deflection of the springs since their actions opposed each other.

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