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By J. O. Bird and P. J. Chivers (Auth.)

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Vi) Point Ε gives the maximum load which can be applied to the specimen and is used to determine the ultimate tensile strength (UTS) of the specimen (often just called the tensile strength). « n f f y j n m f n U T S = load original cross-sectional a r e a (vi) Between points Ε and F the cross-sectional area of the specimen decreases, usually about half way between the ends, and a w a i s t or n e c k is formed before fracture. 56 The percentage reduction in a r e a increase in length during test to destruction original length xlOO% T h e percentage reduction in area provides information about the malleability of the material (see para.

Examples include: (i) a pillar supporting a bridge is in compression; (ii) the sole of a shoe is in compression; (iii) the j o b of a crane is in compression. e. one producing compression, will decrease the length of the material on which it acts. 2 Shear force 6 Shear is a force which tends to sHde one face of the material over an adjacent face. 2. (ii) a guillotine cutting sheet metal, or garden shears each provide a shear force, (HI) a horizontal beam is subject to shear force, (iv) transmission joints on cars are subject to shear forces.

Examples include: (i) the rope or cable of a crane carrying a load is in tension; (ii) rubber bands, when stretched, are in tension; (iii) a bolt; when a nut is tightened, a bolt is under tension. e. one producing tension, increases the length of the material on which it acts. (b). Examples include: (i) a pillar supporting a bridge is in compression; (ii) the sole of a shoe is in compression; (iii) the j o b of a crane is in compression. e. one producing compression, will decrease the length of the material on which it acts.

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