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Topic: Metal Fatigue

Related Topics

Fatigue (material)

Creep (failure mode)

Fracture

Survival analysis

Cold work

Wilhelm Albert

Air safety

Work hardening

Weibull distribution

De Havilland Comet

Metallurgy

Corrosion

De Havilland

	Fatigue (material) - Wikipedia, the free encyclopedia
		In materials science, fatigue is the progressive, localized, and permanent structural damage that occurs when a material is subjected to cyclic or fluctuating strains at nominal stresses that have maximum values less than (often much less than) the static yield strength of the material.
		Fatigue life is influenced by a variety of factors, such as temperature and surface finish, in complicated ways.
		Metal fatigue came strongly to the notice of aircraft engineers in 1954 after three de Havilland Comet passenger jets had broken up in mid-air and crashed within a single year.
	en.wikipedia.org /wiki/Metal_fatigue (1746 words)

	metal, porous - Hutchinson encyclopedia article about metal, porous
		Lightweight metal made by melting metals such as copper, or iron alloys, in a sealed furnace filled with hydrogen, or other gas, under pressure.
		They vary in density from 5% to 75% of the metal and in diameter from 5 micrometres (millionths of a metre) to 10 mm/0.39 in.
		Porous metals were developed in the Ukraine in the 1960s and used in space rockets.
	encyclopedia.farlex.com /metal,+porous (163 words)

	Fatigue
		The number of cycles that a metal can endure before it breaks is a complex function of the static and cyclic stress values, the alloy, heat-treatment and surface condition of the material, the hardness profile of the material, impurities in the material, the type of load applied, the operating temperature, and several other factors.
		The fatigue behavior of a specific material, heat-treated to a specific strength level, is determined by a series of laboratory tests on a large number of apparently identical samples of that specific material.
		Now suppose the fatigue test is halted after 20 to 25% of the expected life of the specimen and a small thickness of material is machined off the outer surface of the specimen, and the surface condition is restored to its original state.
	www.epi-eng.com /BAS-Fatigue.htm (2176 words)

	Metal Fatigue (Site not responding. Last check: 2007-10-21)
		Evaluating the fatigue strength to be used for component design should be carried out using validated material information and with careful consideration of all factors relevant to the stress locations.
		Fatigue considerations are important because the consequent failure is generally sudden and at a stress level much lower than the ultimate stress.
		The fatigue strength is the maximum completely reversed stress under which a material will fail after it has experienced the stress for a specified number of cycles.
	www.royweb.ic24.net /Useful_Tables/Fatigue/Fatigue.html (592 words)

	Metal Fatigue Observed in Mead Paperclips (Site not responding. Last check: 2007-10-21)
		Metal fatigue occurs when a metal is exposed to repeated mechanical stresses and eventually enough chemical bonds in the metal are broken by the mechanical stress so that the metal fractures and breaks.
		One notable example of metal fatigue occurred several years ago to a commercial passenger jet flight to Hawaii.
		Using the value for the minimum number of bends until metal fatigue occurred, I determined that it would be possible to bend one of paperclips 6 times without it breaking (11/2 is approximately 6) and it should begin to exhibit some signs of metal fatigue at this point.
	antoine.frostburg.edu /engin/sem/fatigue.html (411 words)

	Material Technologies Solutions (Site not responding. Last check: 2007-10-21)
		Fatigue is a consequence of a metal undergoing repeated cyclic strain.
		Fatigue damage and the compromise of stability and integrity of the structural member present the constant potential for structural failure and extreme danger.
		FF is a thin piece of metal similar to the material being monitored, consisting of a series of parallel metal strips connected to a common base, much as fingers are attached to a hand.
	www.matechcorp.com /solution.html (972 words)

	Flying Magazine: When Airplanes Feel Fatigued (Site not responding. Last check: 2007-10-21)
		Called the fatigue limit, it is around a third to a half of the tensile yield strength, depending on the material.
		Furthermore, until cracking begins there are no detectable signs of fatigue, which, according to the current hypothesis, build up at the invisible atomic or molecular level, not, as was originally guessed, at the microscopic (but visible) level of the metal’s crystal structure.
		Fatigue tests typically involve inflicting millions, or hundreds of millions, of load reversals upon a sample part of standard shape and surface finish, and generating a curve of stress levels against cycles-to-failure.
	www.flyingmag.com /article.asp?section_id=13&article_id=578 (520 words)

	The SF Site Featured Review: Metal Fatigue
		Metal Fatigue is his debut novel, but it reads like the work of a seasoned pro -- one who hasn't lost the sense of adventure that a fictional world can create.
		Metal Fatigue is, taken at its most simplistic level, a story of the finite lifespan of all things.
		Metal Fatigue is a tough, violent novel of decay and defiance.
	www.sfsite.com /08b/met63.htm (609 words)

	When Metal Lets Us Down
		When metal is stressed beyond its elastic limit or yield point, the result is permanent (or plastic) deformation — when the stress is removed, the metal does not return to its original shape.
		So it is with metal: A tiny and seemingly innocuous nick, scratch or pit may act as a stress riser that concentrates the surface stress enough to cause the part to crack and ultimately fracture.
		Furthermore, while fatigue cracks normally occur at the surface of a metal part where they can readily be detected, a nitrided or shot-peened part may develop subsurface fatigue cracks that cannot be detected during visual or dye penetrant inspections.
	www.avweb.com /news/maint/184271-1.html (3990 words)

	Amazon.com: Metal Fatigue: Computer & Video Games (Site not responding. Last check: 2007-10-21)
		Metal Fatigue takes this convention to the next level by focusing on "combots," giant robots reminiscent of those in various Japanese animated cartoon series.
		Metal Fatigue's concept is innovative both in its modular unit design and in its multilevel battlefields that take place in orbit, on the surface, and underground all at once; but the game's unbalanced units, as well as a few interface problems, cut...
		In Metal Fatigue, you build your standard array of units of any war game (tanks, artillary, missile trucks,etc.) but, the main alure of the game comes from the Combots: giant mechanized robots that beat the living...
	www.amazon.com /exec/obidos/tg/detail/-/B0000296ZN?v=glance (1292 words)

	Sky Ranch Engineering Manual - Excerpts
		Fatigue fractures are the most serious and most common types of failure in machinery.
		Other fatigue failures include the 1988 Boeing 737-200 fuselage failure on Aloha flight 243, and the F-111 wing that failed in 1968 after a few hundred hours (the estimated life was 4,000 hours).
		As a consequence, the engineer must predict the fatigue life of the component and the component must be inspected for fatigue or removed from service.
	www.avweb.com /sponsors/skyranch/enginexe.html (1542 words)

	Strategy Gaming Online - Reviews: Metal Fatigue
		But Metal Fatigue does not have such a license to fall back on, nor did it have any fancy schmancy ad campaigns for exposure.
		But thankfully Metal Fatigue has one weapon under its sleeves that manages to make the formulaic portion of the game less problematic.
		Metal Fatigue tells the story of a galaxy at war due to the presence of some highly valuable planets rich with alien technology (stop rolling your eyes).
	www.strategy-gaming.com /reviews/metal_fatigue/index.shtml (1977 words)

	Swift Metal Fatigue Issues (Site not responding. Last check: 2007-10-21)
		Fatigue is caused by two things: load reversals or cycles, a component being loaded or stressed and then unloaded, and the load or stress applied during these cycles.
		The small skin cracks were probably fatigue or work hardening due to vibration of an unsupported panel.
		As far as fatigue of a major structure component, the only problem I have seen is the horizontal spar crack.
	www.napanet.net /~arbeau/swift/mf.htm (699 words)

	Fatigue Failures
		Metal fatigue is caused by repeated cycling of of the load.
		Metal fatigue cracks initiate and propagate in regions where the strain is most severe.
		Metal fatigue is a significant problem because it can occur due to repeated loads below the static yield strength.
	www.materialsengineer.com /CA-fatigue.htm (337 words)

	Featuring Metal Fatigue Review at ActionTrip
		The real fun in Metal Fatigue comes from cranking up a LAN or Internet game With the abundance of strategy feature, it can be a joyful experience to thresh some of the less experienced strategists around the office...
		Metal Fatigue is one of the rare titles to make that RTS transition from 2D to 3D, and actually succeed in providing a more enjoyable gameplay experience.
		Metal Fatigue was at least to me, a surprise winner.
	www.actiontrip.com /reviews/metalfatigue.phtml (1629 words)

	Metal Fatigue Review for PC - Gaming Age (Site not responding. Last check: 2007-10-21)
		Metal Fatigue uses a three-layer battlefield consisting of air, ground, and underground areas.
		The audio/video aspect of Metal Fatigue is sort of one sided.
		Metal Fatigue is an interesting entry into the real-time strategy genre but one that will ultimately be forgotten.
	www.gaming-age.com /cgi-bin/reviews/review.pl?sys=pc&game=metfat (821 words)

	Fatigue
		(always used with a modifier) boredom resulting from overexposure; "he was suffering from museum fatigue"; "after watching TV with her husband she had a bad case of football fatigue"; "the American public is experiencing scandal fatigue"; "political fatigue".
		Fatigue is a feeling of excessive tiredness or lethargy, with a desire to rest, perhaps to sleep.
		Fatigue can also be quite dangerous when performing certain duties that require constant concentration, such as driving a vehicle.
	www.websters-online-dictionary.com /definition/english/Fa/Fatigue.html (1965 words)

	AVault \| PC \| Metal Fatigue Review (Site not responding. Last check: 2007-10-21)
		Whether it was Transformers or of the Rock 'Em Sock 'Em variety, it's likely that these metallic beings had some sort of spot in your heart at some point or another.
		Countless movies, books and video games have foreseen that the future of humankind is not one of fraternity and mutual understanding, but rather of war and greed.
		Metal Fatigue poses a similar scenario, as 23rd century Earth has been dominated at the hands of large super-corporations called CorpoNations, and their shareholders.
	www.avault.com /reviews/review_temp.asp?game=metalf (1000 words)

	Karl Trek -Metal Fatigue
		When I was a young (19-years-old), newly-minted physicist, my first professional job was testing the metal fatigue properties of various Australian steels at BHP Port Kembla.
		I was fascinated by the concept of metal fatigue.
		Due to metal fatigue, part of the steering linkage had broken.
	www.abc.net.au /science/k2/trek/s100608.htm (1026 words)

	IGN: First Impressions: Metal Fatigue
		In essence, the initial problem with Metal Fatigue is the same problem with almost all RTS games today -- namely, they fear deviation from the traditions established by Westwood and Blizzard.
		Metal Fatigue also has more of a sense of progression than most RTS copies.
		So far Metal Fatigue doesn't have enough going for it to make it stand out in the RTS market, but there are some unique design elements that will keep you entertained at least for a little while.
	pc.ign.com /articles/082/082942p1.html (673 words)

	Metalworking @ MetalworkArt.com (Site not responding. Last check: 2007-10-21)
		Milling is generally done on a milling machine, which is a power-driven machine used for the complex shaping of metal (or possibly other materials) parts, by removing unneeded material to form the final shape.
		In a metalworking lathe, metal is removed from the workpiece using a hardened cutting tool which is usually fixed to a solid moveable mounting called the "toolpost", this arrangement is then moved around the workpiece using handwheels and/or computer controlled motors.
		This is often done by melting the workpieces and adding a filler material to form a pool of molten material that cools to become a strong joint, but sometimes pressure is used in conjunction with heat, or by itself, to produce the weld.
	www.metalworkart.com (2056 words)

	Featuring Metal Fatigue Demo at ActionTrip
		Metal Fatigue is a real-time strategy game that follows the story of three brothers caught up on opposite sides of a war over the riches of long dead alien civilization.
		Set in a fully 3D world with multiple camera angles, Metal Fatigue stands apart from the genre with its numerous innovations: giant, re-configurable Combots 3-Level Play, artificial intelligence from award-winning game designer, Mark Baldwin; and a pre-build phase that gives the player a enough time to establish their base before being attacked.
		In Metal Fatigue, players will manage their units and resources across three levels of play simultaneously.
	www.actiontrip.com /files/demos/metalfatigue.phtml (311 words)

	Metal Improvement Company
		For example, at a 52 HRc (1240 MPa), the fatigue strength of the shot peened specimen is 144 ksi (988 MPa), more than twice the fatigue strength of the unpeened, smooth specimen.
		Comparison of peened and unpeened fatigue limits for smooth and notched specimens as a function of ultimate tensile strength of steel.
		In this case large amounts of surface tensile stress, the seedbed of tensile fatigue cracks, are generated.
	www.metalimprovement.com /met_fatigue.php (443 words)

	Structural Integrity Associates - Metal Fatigue & Fracture Mechanics Course (Site not responding. Last check: 2007-10-21)
		Fatigue of metal components has been shown to be one of the key contributors, if not the prime contributor, to the degradation of aging plant components.
		Metal Fatigue - Fatigue of metal components has been shown to be one of the key contributors, if not the prime contributor, to the degradation of aging plant components.
		Application of modern fatigue design principles, fatigue monitoring, and fatigue management programs permit plants to achieve their design lives and provide the basis for plant life extension.
	www.structint.com /training/mf (472 words)

	Metal Fatigue Cracking
		Metal fatigue is a common cause of structural failures.
		Metal fatigue results in an unexpected and catastrophic failure in use.
		Due to the high number of cycles required for metal fatigue to progress significant damage can occur to the fracture faces of the failed components.
	www.materialsengineer.com /Metal-Fatigue.htm (175 words)

	Sharky Games - '+$ArtG+' - '+$ArtC+' - '+$ArtN+'
		Metal Fatigue does some things well, and might have been a hit a few years ago, but in the competitive RTS market a title needs to be more than good, it has to be nearly error free.
		It is true that MicroProse released a giant robots RTS in MechCommander, but Metal Fatigue, even though coming a couple years later, manages to retain much of the anime feel to robot combat while infusing it with a healthy dose of aggression.
		While the combots are the kings of the Metal Fatigue battlefield, they cannot win wars without their supporting cast.
	www.sharkygames.com /games/reviews/m/metal_fatigue (401 words)

	Seaplane Fleet to Be Tested for Metal Fatigue After Crash - New York Times
		Though many planes are carefully inspected for metal fatigue, it is much harder to find on models that are not extensively used, said John Goglia, an airplane maintenance expert and former member of the safety board.
		One method for finding fatigue before an accident is to spread a dye on the metal, wait for it to seep into cracks and then wipe the surface clean.
		The safety board is probably months away from concluding that metal fatigue was the immediate cause of the Miami crash, said people with experience in its investigations.
	www.nytimes.com /2005/12/23/politics/23plane.html?ex=1292994000&en=d7305d2ef1163d95&ei=5090&partner=rssuserland&emc=rss (766 words)

	Metal Fatigue Details - PC News at GameSpot
		Now that it's been confirmed that Metal Fatigue will in fact be coming to the US via TalonSoft, we've taken a new look at the futuristic real-time strategy game.
		What makes Metal Fatigue stand out from the surprisingly large summer crop of RTS games set in the far future are the giant Combot mechs that dominate the battlefield.
		Another innovation Metal Fatigue brings to the genre is the use of three simultaneous arenas for combat: Ground, orbital, and subterranean levels all need to be controlled simultaneously for optimal resource gathering.
	www.gamespot.com /news/2000/06/22/news_2592951.html (510 words)

	Metal Fatigue & Fracture Mechanics Course
		This two-day course on Metal Fatigue and Fracture Mechanics gives designers and systems engineers an applicable knowledge of in-house design, replacement, or re-evaluation decisions of plant components.
		Fatigue of metal components is one of the contributors to the degradation of aging plant components.
		The metal fatigue portion of this course is designed to increase personnel understanding of the theoretical and practical aspects of fatigue, fatigue failure mechanisms, compliance with regulations, fatigue management tools, and fatigue/cycle monitoring.
	www.hydrocarbononline.com /Content/ProductShowcase/product.asp?DocID={107FD687-2DAD-11D4-8C3D-009027DE0829}&VNETCOOKIE=NO (164 words)

	Metal Fatigue
		The rest of Metal Fatigue, in terms of its RTS components, is uninspired.
		Metal Fatigue is set up in three different levels of play: the orbital level, surface, and underground.
		Winning, even completing a mission, in Metal Fatigue is a challenge of logistics and attention.
	www.gamesfirst.com /reviews/mblackburn/MetalFatigue/mf.htm (822 words)

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