Question

1a. Briefly explain how the fatigue test is carried out.

1b. Briefly explain how the creep test is carried out.

Answer 1

Fati atiqu tshings deginca as Proess of progressite loa a. oce. ' ring in a material Subjec ted to Condi tiom thot predua lctuting stesses and straim at sem poin* Dr Points ơnd lhat mail d» culminate in Cracks or Complut. frac ture atternt number of fluctustiom omunclsue to decrito t test s involuad in cyclic Long se cyclic srese" au normally well below tegeldsti"11h 하 lhe material Ointihal-fatigue damage leadin)カC initiation crack until 1に Asmarig un-Cracked. a Par section Final sdon fra ctur of maini Crass - Srction indey Stresscs to a matenal- ep an alttmotiue Lead These loods de and mans untmaterial fs. 'J f l ot under radation is not Limited to mtals, and most neer materials (Ceィomits , cornfosites, ac krtes Etc.) ) aksusceptible -to -fatigue l of matrials is ameasere et do 7 a measerr tsbitty to sist difor motion , Such abeing Stre tched ,bent Ete Test is high +emperotuuhe frogsessie! deformation at Contant stress 4ligh temperatuur." is a Mlatnet -tem difendert upan matr. , al invovd. Cep rates as used in abusotin metenialsto bo, lars

tjet Enginee ovens o o een Load Load invelves o tensil ecimen unda a Comtont Ls maintained t Conm o stvcun Rimaal or stage-i Seconde or etage !, Tertia tika beginning ot 4にtols, and creep. steady ral oshamtot ot Ti is nea ched Resus lona-to akep increases anti, stage steady "This stoarcis often nderred →t, as, steodal stat, ep , the EReep raa stage lb br ,tedia of 1に。Speurna decreases it. c.oss-set tional area accedati, as Ik sectional da-o a.chny or internal vodig deraseh 1に9トetua asoof gdagen, is allowed →b proceed -hacfuhe uuli oceu Total ctongtio Fractue Tine Chours) Th stes is ally empod to detemine min im um rali in g