It is demonstrated that complex cyclic loads have a positive effect of fretting damage, making the fatigue life shorter than those in constant normal loading conditions.
It is found that the simultaneous enhancement of tensile strength and elongation can be obtained by only one ECAP pass; the optimum fatigue strength of 460 MPa can be gained by two ECAP passes; while further increasing the number of ECAP passes made the fatigue properties worse.
He further stated that NSB had controlled only part of the axle and that if proper tests had been made, the fatigue would have been discovered.
Discontinue routine medications that are no longer appropriate near the end of life that may be making the fatigue worse (eg, antihypertensives, cardiac medications, diuretics, etc).
Improved stress-intensity factor equations for a corner crack at the edge of an open hole under remote bending were used to make the fatigue-life calculations.
This method can serve as a kind of virtual experimental vehicle as well, which makes the thermal fatigue simulation test more controllable and predictable.
The development of the engineering application of welding techniques in the industries of building engineering, civil engineering, aerospace manufacturing, and offshore exploitation makes the research on the fatigue life of welded steel structures a problem with the utmost importance.
