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Inside this Book – Suppose a scale-pan attached to the top of a strut or bottom of a tie and the other end fixed. Let a weight be put in contact with the pan, but be otherwise supported so as to exert no stress on the piece, and the next instant let it rest all its weight on the piece, then will the weight do work against the resistance offered by the straining of the piece till the weight ceases descending and comes to rest, when the piece will be for an Instant at the greatest strain under the circumstances, at a strain greater than the weight can keep it at ; the unstraining of the piece will therefore cause the weight to ascend again, doing work against it to the amount that the weight did in descending, and so the weight will return to its &st position, then begin to descend again, and so oscillate up and down through an amplitude equal to the augmentation. Owing to other properties of the matter, whereby some of the work is dissipated during each strain and restitution, the amplitude diminishes every oscillation, and the weight will finally settle at the middle of the amplitude.
Inside this book –Elementary Applied Mechanics PDF Book by A. W. Thomson – We have as yet only considered the statical condition of strain, i.e., of a body kept in a state of strain by external forces, these forces being balanced by the reactions of the solid at their places of application due to the elasticity, and the forces exerted on any portion of the solid being in equili- brium with the reactions of the contingent parts. Thus when we found that 32,000 lbs. produced a strain of 00063 on a tie rod 100 feet long and 2 sq. inches in area, in all stretching it f ths of an inch, we meant that the weight kept it at that strain ; the rod is supposed to have arrived at that pitch of strain and to be at rest, to be stretched the f th inch, and so (by its elasticity or tendency to regain its original length) to balance the weight.
Elementary Applied Mechanics by A. W. Thomson PDF : eBook Information
- Full Book Name – Elementary Applied Mechanics
- Author of this Book – A. W. Thomson
- Language – English
- Book Genre – Nonfiction, Elementary, Applied Mechanics
- Download Format – PDF
- Size –
- eBook Pages – 544
- Price – Free