โ Scribed by David Townsend
No coin nor oath required. For personal study only.
In investigating the subject of the punching of metals, and the consequent flow which occurs, no exact law could be determined, covering all cases, owing to the limited number of experiments made, and also to the want of technical knowledge on the subject. M. Tresca, in La Poinfonnage des Mgtaux, published some experiments on the punching of iron, but his results cannot be accepted as complete and accurate, owing to the fact that the means at his disposal were limited; those that were arrived at, were for the action of a large diameter of punch upon small thickness of metal. His experiments were made with a punch of l'18 inches diameter (30 ram.), on iron plates, the greatest thickness being "669 inch (18 ram.), and the least "1968 inch (5 ram.). He announced, as the result of his investigations, the general law that "when pressure is exerted upon the surface of any material, it is transmitted in the interior of the mass from particle to particle, and tends to produce a flow of metal in the direction in which the resistance is least."
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