A Method of Measuring Shear Modulus from -424° to 70°F
Figure 1 illustrates the apparatus for shear-modulus measurements. The specimen to be tested is secured to two concentric stainless steel cylinders. One of the specimen ends is inserted into a brass adapter which screws into a brass fitting soldered to a cylinder 8½ in. long and 2 in. in diameter with 0.1-in. wall thickness. The other end is secured to a small adapter which also screws into a brass fitting soldered to a cylinder 61/8 in. long, of 1½ in. diam, and 0,07 in. in wall thickness. Figure 2 illustrates how each end of the specimen is attached to an adapter. The outer cylinder Is soldered to a stationary brass plate which rests on a one-liter glass dewar. A couple is applied to the inner cylinder by means of slotted brass weights placed on pans. This vertical force is transformed to a horizontal force through a set of pulleys attached to the brass plate. The weight pans are held up with constantan wires which are attached to slots soldered to brass sectors.
KeywordsShear Modulus Outer Cylinder Ballistic Missile Brass Plate Torsion Specimen
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