Thetermmetalfatiguereferstogradualdegradationandeventualfailurethatoccurunderloadswhichvarywithtime,andwhicharelowerthanthestaticstrengthofthemetallicspecimen,componentorstructureconcerned.Thestaticstrengthistheloadwhichcausesfailureinoneapplication.Theloadsresponsiblearecalledfati