aluminum for roof

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Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO).

The strength and durability of aluminium alloys vary widely, not only as a result of the components of the specific alloy, but also as a result of heat treatments and manufacturing processes. A lack of knowledge of these aspects has from time to time led to improperly designed structures and gained aluminium a bad reputation.

One important structural limitation of aluminium alloys is their fatigue strength. Unlike steels, aluminium alloys have no well-defined fatigue limit, meaning that fatigue failure eventually occurs, under even very small cyclic loadings. This implies that engineers must assess these loads and design for a fixed life rather than an infinite life.

Another important property of aluminium alloys is their sensitivity to heat. Workshop procedures involving heating are complicated by the fact that aluminium, unlike steel, melts without first glowing red. Forming operations where a blow torch is used therefore require some expertise, since no visual signs reveal how close the material is to melting. Aluminium alloys, like all structural alloys, also are subject to internal stresses following heating operations such as welding and casting. The problem with aluminium alloys in this regard is their low melting point, which make them more susceptible to distortions from thermally induced stress relief. Controlled stress relief can be done during manufacturing by heat-treating the parts in an oven, followed by gradual cooling—in effect annealing the stresses.

The low melting point of aluminium alloys has not precluded their use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region.

Another alloy of some value is aluminium bronze (Cu-Al alloy).


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Q:When you mix sodium hydroxide with water then add aluminum hydrogen gas is given off, is this from the water?
Aluminium does not normally react with water because of a surface coating of the highly unreactive Al2O3 that forms on exposure to atmospheric oxygen. In the presence of strong base, however, this compound dissolves due to complexation by hydroxide, similarly to how silver chloride dissolves in ammonia. Al2O3(s) + 2OH-(aq) + 3H2O(l) ----- 2[Al(OH)4]-(aq) Once this has occured, aluminium metal, a very strong reducing agent, is exposed to water. 2Al(s) + 6H+(aq) ----- 2Al3+(aq) + 3H2(g) Even though the solution is alkaline, there is still a low concentration of H+ formed by the autoprotolytic dissociation of water. The Al3+ formed then reacts with hydroxide to produce more [Al(OH)4]-. Yes, the hydrogen gas is from the water.
Q:Will copper and an aluminum solution react? *BEST ANSWER POINTS!?
Figure out the Eknots using a chart. Cu -- Cu2+ = Enot of ? Al3+ --- Al = Enot of ? It needs to be positive to spontaneously react. I believe from memory that Al -- Al3+ is 1.3volts, so the reverse is negative. Meanwhile Cu is something under .5 volts, so it won't be enough to make the reaction work. This is further understood because aluminum requires a lot of energy to smelt from the oxide (which is the reverse reaction of Al3+ -- Al that you're talking about here) Secondly, do your homework man, it's REALLY obnoxious to add the why or why not and phrase everything exactly as your homework asks. Try to ask a question about the topic so you actually learn. For example, what are reduction potentials in terms of, for example, Cu --- Cu2+
Q:Can you paint aluminum foil using acrylic paints?
i use aluminum foil to mix colors on and when it dries it DOES stick, however, it will scratch off really easy. just try experimenting. what do u need the foil for? maybe you can try the aluminum foil leaves? the flakes that you put ontop on the art instead of under it. that way you can glue it on and dont have to worry about it scratching off. foil looks beautiful on paintings :) how it turns out great
Q:Why is aluminum preferred over iron-based alloys in the aerospace and?
Aluminum is chosen in aerospace because it is light weight. Iron is preferred in structures here on earth because of its strength and suitability to endure gravity for a long period of time.
Q:How much does one atom of aluminum cost?
You have : ---------------- V = aluminum volume in one roll = ( L ) ( W ) ( t ) V = ( 500 ft ) ( 1.5 ft ) ( 0.94 mil ) ( 1 in / 1000 mil ) ( 1 ft/12 in ) V = 0.05875 ft^3 m = aluminum mass = ( d ) ( V ) m = ( 168 lbm/ft^3 ) ( 0.05875 ft^3 ) = 9.87 lbm m = ( 9.87 lbm ) ( 453.6 g / 1.0 lbm ) = 4477 g n = moles of aluminum in one roll = m / M n = ( 4477 g ) / ( 27 g/mol ) = 165.8 moles Al N Al atoms = ( n Al ) ( NAVO ) N Al atoms = ( 165.8 mol ) ( 6.022 x 10^23 atoms / mol ) N Al atoms = 998.5 x 10^23 Al atoms C* = cost per atom = cost of aluminum roll / number of aluminum atoms in one roll C* = ( 4898 cents ) / 998.5 x 10^23 atoms ) C* = 4.91 x 10^-23 cents per Al atom --------------- Please award Best Answer to the most correct and most helpful response to your question. C* =
Q:why could aluminum pot be repaired by knocking the aluminum sheet into the pot but not being bonded by glue?
the oxidation rate of aluminum's surface is very quick, so we cann't use the method of tin welding, and the cost of argon arc welding is very high,so aluminum pot's repair usually uses riveting. aluminum has low hardness and good ductility, so it can be repaired by tightly knocking, without the bonding of glue. general glue will decomposed in open fire, if we bond pot by glue, the pot after repair won't be able to endure high temperature.
Q:Why aluminum reacts slowly with dilute acids?
rethink your question, is non sensical at this point.
Q:why can aluminum sheet after oxide film removal react quicker with hydrochloric acid?
the reason is very simple, the original aluminum sheet has a layer of dense oxide film AI2O3, which has prevented the inner aluminum sheet from reacting with hydrochloric acid. but after oxide film removal, aluminum sheet will directly contact hydrochloric acid, generating H2.
Q:A solid aluminum ingot weighs 71.0 N in air.?
first find the volume of your aluminium. youll need this when analyzing the bouant force F(b). the sg of aluminum is 2.7 and the density of water is 1000 kg/m^3 so the density of aluminum is 2.7x1000=2700kg/m^3. the mass is 71N/g = 7.237512742 kg. so volume of our piece of aluminum = mass/density = 0.0026805603 m^3 now analyze the forces being applied to the system. There are three, the force of gravity F(g), the buoyant force F(b) and the tension T. Tension and buoyant force push up, gravity pulls down. the system will be at rest since the rope is holding it at rest. so T + F(b) - F(g) = 0 T + (Volume aluminum X density water X g) - (MAss of aluminum x g) = 0 T + (0.0026805603x1000x9.81) - (71 N (given in problem)) = 0 Solving for T, T = 44.70370346 N = 45 N using sig figs.
Q:Status of aluminum sheet F
Status of aluminium plateThe F is free, and the aluminum sheet state is not limited. It is suitable for the products which have no special requirement for the working hardening and the heat treatment conditions in the forming process. The mechanical properties of the products in this state are not specifiedO is an annealed state, that is, a fully soft state, suitable for fully annealed products with minimum strength

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