Question

Your company is designing a part that will see a cyclically applied load, before calculating the number of cycles till failure you need to determine the endurance limit. Determine the endurance limit on the given loading, geometry, and material.

Given Data:

Sut = 800 MPa

Sy = 310 MPa

Operating temperature = 55 degrees C

Surface Finish: Forged

Specimen Rotating? No

Cross-section: Rectangle

b = 40 mm

h = 40 mm

Reliability = 90%

Stresses	Min(MPa)	Max(MPa)	Mean(MPa)	Amp(MPa)
Axial	0	0	0	0
Bending	-20	10	-5	15
Torsion	-10	10	0	10
Von Mises	65.34	93.62	14.5	79.41

Answer 1