A Handbook of Testing; Materials - By C.A.M. Smith

A Handbook of Testing; Materials - By C.A.M. Smith

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...is known as Poisson's Eatio, and is usually designated by the letter m. As the lateral strain is very small, it is exceedingly difficult to measure it accurately by direct method. Hence the most usual way is to obtain the moduli of elasticity and rigidity in the manner already stated, and calculate m from the following equation: --E-2C The following table gives mean values of in for some of the more usual metals: --Torsional Experiments on Wire.--The value of the shear modulus can be determined in the case of wires by two methods--(a) by static deflection and (b) by torsion vibration. Fig. 92 shows the first method in diagrammatic outline. A wire is first pulled taut by being fixed at its lower end and attached to a tightening screw at the top. To the wire is attached a light brass drum carrying a scale divided in degrees. A light cord is passed once or twice round the drum and over two fixed pulleys. To the ends of the cords are attached small scale pans or weight hooks. Equal weights are placed in the scale pans, and the twist of the wire observed by reading the movement of the circular scale relative to a fixed pointer. The twisting movement is, of course, the product of the weight in one scale pan into the diameter of the drum. C is obtained from the formula--f, = 584M7, id where M is the twisting movement in lbs. inches, I the length of wire in inches, 0 the deflection in degrees, and d the diameter of the wire. Fig. 93 shows the very simple form of apparatus used to determine C by torsional vibrations. The wire is fixed as before, and carries near its lower extremity a light brass tube. Four other pieces of tube are provided, each exactly one quarter of the length of the long tube, and made to slip inside it. Two of the short pieces are...
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Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236655141
  • 9781236655141