In Service Material Effects (10)

Question 1

Cyclic Loading

Answer 1

Repeated or fluctuated stresses below the tensile strength

- Application is on areas of pre-existing localized stress and fatigue and initiate Fatigue Cracking

Question 2

Cyclic Loading

Answer 2

That application of additional stress on a repeated basis that will cause the dislocation of atoms at the point of stress.

• Stress loading can be above or below the elastic limit
• Sharp edges, notches, keyways etc
• from tearing, grinding, cracks, laps, pits

Question 3

Cyclic Loading

Answer 3

That application of additional stress on a repeated basis that will cause the dislocation of atoms at the point of stress.
- Stress loading can be above or below the elastic limit

Question 4

Constant Static Loading

Answer 4

Steady load that is applied to a material or structure that does not fluctuate.

Question 5

Overstress

Answer 5

Load that exceeds the ultimate strength of a material applied in a single application causing sudden catastrophic failure.

Question 6

The Environmental Effects

Answer 6

Weather even ultraviolet sunlight can have detrimental effects

Question 7

The Environmental Effects

Answer 7

Weather even ultraviolet sunlight can have detremental effects

Question 8

Operational Wear

Answer 8

The application of cyclic or static loading working in concert or independently depending on movement of parts during operation that causes sudden material degradation.
- Abrasion, Erosion, Friction

Question 9

Corrosion

Answer 9

Deterioration of metals by a chemical reaction.
- Liquid, Gas or combination
Caused by
- Direct chemical action
- Electrochemical action
Mediums: water, brine, acids, alkaline, caustic fumes, bacteria (exotic)