Nowadays, the construction industry is echoing with the word "Sustainability." Everyone seems to be focused on finding more sustainable design solutions for building structures and objects.
The moment we realized that we would have to work on installing eco-friendly systems to help the planet recover from the damage done by human hand, most new construction projects were required to be eco-friendly.
However, going green isn't as simple as it sounds. It's a huge challenge, and worki
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Mechanics Corner #50
A Journal of Applied Mechanics and Mathematics by DrD
Why You Should NOT Use the D'Alembert's Principle
I think it is safe to say that every engineering student studies both Statics and Dynamics. We are told that Statics is easier than Dynamics, which is often true but not so in all cases. When we get to Dynamics, many teachers, particularly physics teachers, will urge the use of something called D'Alembert's Principle. The
A Journal of Applied Mechanics & Mathematics, #49
A Bad Example
Most of us are inclined to trust an established textbook. We assume (1) the author knows what he is talking about, (2) the book has been carefully vetted by several editors and reviewers, and finally (3) the fact that it is well established in the market means that thousands of other readers have tacitly endorsed it as well. While these assumptions are usually true, they are no guarantee, and they
Governor sensitivity is the ratio of
A. range of speed to the mean speed
B. maximum speed to the minimum speed
C. mean speed to the range of speed
D. effort of governor to the range of speed
E. governor lift to the range of speed
Today, I have a question for readers. I'd like to get everyone who is willing to answer the same question, but also tell me whether you are a practicing graduate engineer or if you currently a student. I think these two groups will answer somewhat differently, so it is important that you identify which one you fall into.
The question is really simple: When you ask for help, what do you really want? Are you asking for someone to step in and solve a problem for you? Or, are you asking for a f
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(a) Describe the steps usually considered in the process of material selection.
(b) How material selection is done using decision theory.
Ans. (a) Like any other aspect of engineering design, material selection is also equally important aspect. Material of part depends on the requirements of the part, number of parts needed, and manufacturing process to be adopted to make the part. The material selection primarily depends upon its properties and several other factors like availa
Temperature has pronounced effect on the properties of zinc and zinc alloys. The creep resistance, in particular, decreases rapidly with increasing temperature. Ductility and general fabricating characteristics increase with temperature. Drawing and forming operation should never be attempted below 20°С. More severe operations can be performed readily at temperatures above 50°C. Zinc alloys become somewhat brittle below 0°C, depending on the particular composition, but recover their normal prope
Season cracking is spontaneous cracking which occurs on exposure to atmospheric corrosion in brass objects with high residual tensile stresses at the surface. It occurs with high-zinc brasses but rarely with 15 per cent zinc or below. Alloys susceptible to spontaneous season cracking will crack when exposed to corrosive conditions under high service stress, even if they are free from internal strains. Season cracking can be prevented by avoiding the production of internal microstresses or by rem
State, with reasons, suitable material for the manufacture of each of the following, giving the approximate composition :
(a) a brass for deep pressed containers; (b) a brass for small machined bolts ; (c) a bronze for the impeller of a sea-water pump.
(a) The suitable brass for deep pressed containers is the admiralty brass containing copper and zinc in the proportion of 7 to 3, with 1% of tin.
The addition of tin to the basic cartridge brass (70% copper, 30% zinc), gives
(a) What is the main difference between a brass and a bronze ?
(b) State the composition, and two common uses of a bronze commonly used in engineering.
(c) What is the general effect of adding a small proportion of (1) phosphorus, (ii) lead, to a bronze ?
(a) A brass is an alloy of copper and zinc, the major constituent being copper. A bronze is an alloy of copper and tin, the major constituent being copper.
(6) A bronze commonly used in engineering and commonly known
(a) Which two elements are alloyed to form a brass ?
(b) What are the differences (i) in composition, (ii) in uses, of an 'alpha' and an 'alpha-beta' brass ?
(a) A brass is essentially an alloy having major constituents as copper and zinc. Minor proportions of elements such as lead and tin may be included to promote special properties.
(b) An alpha brass is an alloy in which zinc does not exceed by 38%. This brass is ductile and, therefore, used for cold-rolled sheets, wire