6) Plastic deformation in a ductile machine ch question 10 points element causin

Question

6) Plastic deformation in a ductile machine ch question 10 points element causing separation into multiple pieces a. Ductile rupture b. Buckling c. Brittle fracture d. Fatigue 1) Plastic deformation amplified by high temperature operation over time a. Fretting b. Cavitation corrosion c. Creep d. Thermal shock stress e. Surface erosion Plastic deformation in a ductile machine element causing separation due to crack propagation a. Ductile rupture b. Fatigue c. Fretting d. Spalling 7) Static normal loads between two curved surfaces in contact producing significant plastic flow and permanent surface discontinuity a. Spalling b. Galling c. Brinelling d. Yield e. Corrosion 2) 8) surface damage due to metal particles dislodging because of excessive dynamic rolling pressure between two machined parts a. b. Spalling c Galling d. Galvanic Corrosion 3) Which failure is not wear? a. Corrosive b. Fretting c. Cavitation d. Adhesive massive surface destruction between two moving machine parts a. Rupture b. Fatigue c. Impact d. Galling 9) Plastic deformation in a ductile machine element a. Fretting b. Yield c. Brinelling d. Buckling e. Rupture 4) Localized surface attack on metallic machine part resulting in holes or irregular patterns a. Pitting Corrosion b. Fatigue c. Adhesive Wear 10) Surface damage caused by small vibration at a joint that was un-intended a. Wear b. Fatigue c. Fretting d. Creep e. Galling 5)

Explanation / Answer

1 (c) Creep In materials science, creep  is the tendency of a solid material to move slowly or deform permanently under the influence of mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods.

2(c)Brinelling is a material surface failure caused by Hertz contact stress that exceeds the material limit. It usually occurs in situations where a significant load force is distributed over a relatively small surface area. Brinelling typically results from a heavy or repeated impact load, either while stopped or during rotation, though it can also be caused by just one application of a force greater than the material limit.Brinelling can be caused by a heavy load resting on a stationary bearing for an extended length of time. The result is a permanent dent or "brinell mark".

3(c) Cavitation

4(d)Ductile materials exhibit massive amounts of plastic buckling or deformation in comparison to brittle materials. In ductile fracture, the crack grows at a slow pace and is accompanied by a great deal of plastic deformation.

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