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Updated: May 9, 2025
The tensile strength of this alloy is usually given as 100,000 pounds to the square inch; but castings of our ten per cent. bronze have stood a strain of 109,000 pounds. It is a very hard, tough alloy, with a capacity to withstand wear far in excess of any other alloy in use.
This arrangement is not now in common use on account of the trouble attending its employment, and at present the saws are merely strained by hammering up the keys. The saw blades had usually a tensile strain of upwards of one tun per inch of breadth of blade.
The one that could apparently phase out almost any electromagnetic frequency up to about a hundred thousand megacycles including sixty-cycle power frequencies was considered to be a particularly cute item. So was the gadget that reduced the tensile strength of concrete to about that of a good grade of marshmallow.
This trouble has been remedied by the 9-thread, taper-cut pipe of the present day, which is tested at the mill to 1,500 pounds pressure, while the average duty required is 1,200 pounds; as the iron used in the manufacture of this line-pipe will average a tensile test strain of 55,000 pounds per square inch, the safety factor is thus about one-sixth.
It has also been found that malleable iron is extended about one ten-thousandth part of its length for every ton of direct strain applied to it. Q. What is the limit of elasticity of cast iron? A. It is commonly taken at 15,300 lbs. per square inch of section; but this is certainly much too high, as it exceeds the tensile strength of irons of medium quality.
The ultimate tensile strength, therefore, of malleable iron is four times greater than that of cast iron, but the crushing strength of cast iron is between three and four times greater than that of wrought iron.
Ef yo' hed lived sixty year ago 'nd men hed told yo' ther wur in common clay a metal ez bright ez silver, ez ductile ez gold, with almost ther tensile strength uv steel; sunthin' thet could be worked inter eny form, indestructible under ther usual destructive agents of ther world, yo' wouldn't ha' believed it, would yo'? Yet it war thar all ther time. Fur thousands of years, men delved in clay.
Tensile strength, about two hundred thousand times that of good steel!" The audience gasped. That seems little to men who do not realize what it meant. An inch of this stuff would be harder to penetrate than three miles of steel! "Our new ship," continued Arcot, "will carry six-inch armor.
When ores of iron require to be brought from oversea places, it is obvious that those which will concentrate to the purest product possible, and which are in other respects specially applicable to the production of grades of steel of exceptional tensile strength, will have the preference.
Because of the sudden tensile strain brought to bear upon tendons in the shocks of concussion, as well as in propulsion of the body, there frequently occurs a rupture of fibers and this we know as sprain.
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