Fatigue quiz - 1 Mention atleast three methods by which fracture occurs Slow application of external loads Rapid application of external loads Cyclic or

Fatigue quiz - 1 Mention atleast three methods by which...

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1. Mention atleast three methods by which fracture occurs Slow application of external loads Rapid application of external loads Cyclic or repeated loading Time dependent deformation under constant load 2. What is fatigue? How does it occur? Fatigue is the phenomenon of failure of a material under cyclic loading. It is a problem that effects any component or part that moves. 3. Mention three factors that are necessary to cause fatigue fracture Applied stress of sufficient magnitude Large variation or fluctuation in applied stress Sufficiently large numbers of cycles of the applied stress 4. What is endurance limit? How is it measured in practice? The maximum stress that can be applied repeatedly over 10^8 cycles without fracture. 5. Mention three factors affecting fatigue life Types of loading, surface roughness, uneven cooling, grain size, evironmental conditions 6. What is stress concentration?
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Unformatted text preview: A location in an object where stress is concentrated. ie. holes, cracks, notches, sharp corners. 7.Mention three types of fatigue testing Tension-compression Tension-tension Irregular or random Sheet and plate bending Sample factures when the applied stress is below endurance limit F Fatigue loading reduces the yield strength of a material T Fatigue failure can be caused by a constant steady load F Fatigue fails in a ductile manner only in ductile materials F Existence of a notch on the test specimen helps to increase the fatigue life F 90% of all fractures are caused by high rates of loading F Only materials that move are affected by fatigue T Airplane wings are not affected by fatigue F 9 Identify the specimen that will fail first The one with hole 10. What are two different marks seen on a fracture surface caused by fatigue? Beachmarks and Striations...
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