Complete the tollowing sentences $($one word tor each empty space$).$

Fatigue

is the stress level that produces the rupture of the specimen after a

certain number of cycles.

Fatigue

number of cycles required to cause the specimen to break at a specified

stress level.

Superficial treatments that improving the surface finish of the part, for example by polishing,

reduces the presence of stress concentrators and significantly

fatigue life.

When the materials are subjected to wide ranges of temperature variation, they tend to

increase or decrease their volume, if there is a restriction to change their dimensions, thermal

stresses will occur that will produce cracks in the part,

its fatigue life.

Corrosion produces pitting on the surface of the parts that can become stress concentrators, causing the appearance of

surface cracks, so the effect of corrosion will be to

the fatigue life.