Experimental Researches on the Strength and Other Properties of Cast Iron: With the Development of New Principles; Calculations Deduced from Them; and Inquiries Applicable to Rigid and Tenacious Bodies Generally

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Weale, 1846 - 504 стор.
 

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Сторінка 332 - The strength of a pillar, with one end rounded and the other flat, is the arithmetical mean between that of a pillar of the same dimensions with both ends round, and one with both ends flat. Thus, of three cylindrical pillars, all of the same length...
Сторінка 350 - ... was found to be very small, perhaps not half the strength that the same metal would have given if cast in the form of a uniform hollow cylinder. " A pillar irregularly fixed, so that the pressure would be in the direction of the diagonal, is reduced to one-third of its strength. Pillars fixed at one end and...
Сторінка 350 - In hollow pillars, of greater diameter at one end than the other, or in the middle than at the ends, it was not found that any additional strength was obtained over that of cylindrical pillars.
Сторінка 315 - Art de bdtir) that cubes of malleable iron, and prisms of various kinds of stone, were crushed with forces which were directly as the area, whilst from Mr. Rennie's experiments, both upon cast iron and wood, it would appear that the resistance increases, particularly in the latter, in a much higher ratio than the area, (Mr. Barlow's Treatise, Art. 112).
Сторінка 333 - A long, uniform, cast-iron pillar, with its ends firmly fixed, whether by means of discs or otherwise, has the same power to resist breaking as a pillar of the same diameter, and half the length, with the ends rounded or turned so that the force would pass through the axis.
Сторінка 378 - Effects of Temperature upon the Strength of Cast-Iron. The strength of cast-iron is not reduced when its temperature is raised to 600°, which is nearly that of melting lead ; and it does not differ very widely whatever the temperature may be, provided the bar be not heated so as to be red hot.
Сторінка 338 - ... resisting flexure. When the breaking-weight is one-half the pressure required to crush the pillar, one-half of the strength may be considered available to resist flexure, and the other half to resist crushing. And when the breaking-weight is so great as in the case of short pillars, it may be considered that no part of the strength of the pillar is applied to resist flexure. These two effects may be separated in all pillars by dividing the pillar into two portions, one of which would support...
Сторінка 353 - I have many times sought, experimentally, with great care for the weight producing incipient flexure, according to the theory of Euler, but have hitherto been unsuccessful. So far as I can see, flexure commences with weights far below those with which pillars are usually loaded in practice. It seems to be produced by weights much smaller than are sufficient to render it capable of being measured.
Сторінка 351 - Comparative Strengths of Cast Iron, Wrought Iron, Steel, and Timber. " It resulted from the experiments upon pillars of the same dimensions but of different materials, that if we call the strength of...
Сторінка 308 - This part, which was weaker than the ends, was intended to be torn asunder by a force acting perpendicularly through its centre. The ends of the castings had eyes made through them, with a part more prominent than the rest in the middle of the casting where the eye passed through.

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