material science mechanical
2007-12-26 14:04:09 · 7 answers · asked by Nayana G 1 in Science & Mathematics ➔ Engineering
Fatigue is an increase in stress due to crack propagation - which leads to eventual failure.
Creep is stress relaxation, the material deforms plastically under stress that is less than the yield strength.. Creep doesn't necessarily mean failure, but it usually isn't good...
Both are similar in that they usually take time to happen.
2007-12-26 14:13:56 · answer #1 · answered by Ron E 5 · 3⤊ 2⤋
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RE:
what is the difference between fatigue and creep? propertis of material?
material science mechanical
2015-08-06 20:35:50 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Fatigue is a result of repeatedly applied loads,generally the loads need to be in excess of some fatigue stress limit,as an example air craft wings,particularly the roots where they join the the mainframe are subject to their strongest stresses at take off and landing and these areas are checked by eddy current,X-ray and sometimes dye-penetrant crack detection at regular intervals,which might be every 1000 landings(more or less often dependant on service.
In creep we are normaly concerned with with long time operation under long time stess at temperatures at or above a half of the melting temperature of the alloy IN DEGREES KELVIN.
In creep the alloy acts as if it were toffee or plasticine.
In fatigue ductile metals act as if they're brittle
2007-12-27 06:24:27 · answer #3 · answered by Anonymous · 2⤊ 0⤋
Lots of great answers already. Also note that fatigue occurs due to fuctuating or reversing loads at a stress level well below the yield point (usually below 60% of yield especially for high strength steels), while creep occurs at a steady and very high load near the yield point (above 80 % of yield).
2007-12-26 17:01:15 · answer #4 · answered by Engineer Dave 3 · 3⤊ 0⤋
Fatigue happens under a repeated (cyclical) load, ie. Repeatedly pressing and releasing a spring.
Creep occurs under constant load, ie. A turbine blade at a power plant that sees very long run cycles of months at a time.
Similar in practice, but the dislocation mechanisms behave differently.
2007-12-26 15:59:25 · answer #5 · answered by Sithlord78 5 · 5⤊ 0⤋
Ron E has most of it.
Also be aware that 'fatigue` comes from
varying loads. It is not a steady state thing.
Creep is flow and occurs under constant load.
2007-12-26 14:37:06 · answer #6 · answered by Irv S 7 · 3⤊ 0⤋
fatigue is when you bend a piece back and forth then it fails like A papen clip, to break it you bend it back and forth.
creep is like when you stand on a pice of wood and it slowliy deforms and then deforms more and more .
2007-12-28 00:58:43 · answer #7 · answered by Anonymous · 0⤊ 1⤋
Hot. Yuck and hubba hubba mean the same when slurred.
2016-03-18 03:40:03 · answer #8 · answered by Anonymous · 0⤊ 0⤋