very serious in brittle materials and less serious in ductile materials

very serious in ductile materials and less serious in brittle materials

equally serious in both types of materials

seriousness would depend on other factors

static load

dynamic load

impact load

completely reversed load.

straining

fatigue

creep

sudden loading

is greatly decreased by poor surface conditions

remains same irrespective of surface conditions

depends mainly on core composition

is dependent upon yield strength of material

increases the fatigue strength

decreases the fatigue strength

has no influence on fatigue strength

alone has no influence on fatigue strength