The elasticity and resistance of the materials of engineering . The head of the eye bar (one is shown in elevation in ) requires the greatest care in its formation. It is imperfect Art. 75.] EYE BAR HEADS. 645 unless it be so proportioned that when the eye bar is tested tofailure, fracture will be as likely to take place in the body ofthe bar as in the head—in other words, unless its efficiency isunity. In Fig. 2 the head of the eye bar, or link, is supposed to beof the same thickness as that of the body of the bar whosewidth is w. ^. B-4-G- M K If t is the thickness of the bar, so
The elasticity and resistance of the materials of engineering . The head of the eye bar (one is shown in elevation in ) requires the greatest care in its formation. It is imperfect Art. 75.] EYE BAR HEADS. 645 unless it be so proportioned that when the eye bar is tested tofailure, fracture will be as likely to take place in the body ofthe bar as in the head—in other words, unless its efficiency isunity. In Fig. 2 the head of the eye bar, or link, is supposed to beof the same thickness as that of the body of the bar whosewidth is w. ^. B-4-G- M K If t is the thickness of the bar, so that wt is the area of itsnormal section, then t is almost invariably included betweenthe limits of y^w and yiw. In fact these extreme values areeach too extreme for the full resistance of the bar, althoughthey are sometimes used. These ratios, as well as the diameterof the pin in terms of w^ can only be determined by experi-ments on full-sized bars. A large number of such experimentshave been made both in this country and in Great Britain, andwhile the resistance of the bar as a whole depends to a con-siderable extent on the mode of manufacture or formation ofthe head, it has been found that for the best proportioned headt should range from y^w to Y^w, and the diameter, <-/, of thepin from ^iv to w. It is extremely difficult to reach more than a general ideaof the condition of stress in an eye bar head, although an ap-proximate mathematical treatment of the question may befound in the Trans. Am. Soc. of Civ. Engrs., Vol. VI., 1877
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