Question

2. Tensile and fully reversed loading fatigue tests were conducted for a certain steel alloy and revealed the tensile strength and endurance limit to be 1200 and 550 MPa, respectively. If a rod of this material supply were subjected to a static stress of 600 MPa and oscillating stresses whose total range was 700 MPa, would you expect the rod to fail by fatigue processes? Use the Gerber relation for the analysis.

Answer 1

Given that:

Tensile and fully reversed loading fatigue tests were conducted

  and endurance limit to be 1200 and 550 MPa, respectively a static stress of 600 mpa and osxillating

the range was 700 MPa, would you espect therd

Tensile strength $\sigma$ rt = 120 mpa

Endurance limit $\sigma$ e = 550 mpa

Static stress = 600 mpa
Answeer - Tenside strengthe The tesistance of a material to breeus ing cendertension 400 cotiles Asuming caual d opposite stresy dwuing os Cilation Hence Catensile) = 35ompa & cemp = 3.5ompa how max = 600+ 3550 ix-950 MPa min=600-350 min =25ompa min ta= max- 960-290 ra - 2

od= 700/2 oa 2350 mpa man -amin Tm =- 250+250 Time m=600 mpa wherre o a=streu amplitude oma meen stress ate e corbey contestar reauivalent = 1063.65mpa a applied û desthan itensite strength of matericel but more than endu stanie elind- .. thus the material will not fall under tensile Woading but the material will undevy fatigue Loading