Fatigue of Materials
It is usually more effective to use a macro phenomenological method to model the effects of fatigue mechanisms on fatigue life rather than using a microscopic approach.
Switch motor ON and OFF to verify smooth running. The bending stress for the test is selected and required load or weight is applied on the load hanger. The revolution counter is set to zero before starting the machine and safety guard is used over the apparatus. The fracture time which might occur is estimated and noted.
Finally, (Akbardoost et al, 2017), (Spagnoli et al, 2016) and (Yan et al, 2015) deal with size effect on the fracture resistance of quasi-brittle materials, like natural stones and concrete.
Such measures include: Designs that minimize stress concentration sites, blend grinding of weld profiles and requiring that transitions in thickness be gradual and smooth. Use of controlled rates of heating and cooling rates during start-up and shut-down. Minimizing the frequency of start-ups and shut-downs, particularly “trips.” Minimizing differential thermal expansion in dissimilar metal joints. Where possible, incorporate flexibility that will accommodate differential expansion.
Volume 39, Issue 5, May 2016, Pages 611–623
Volume 39, Issue 11, November 2016, Pages 1337–1351
Statistical aspects of fatigue life and endurance limit
Volume 33, Issue 6, June 2010, Pages 333–344
Andrea Spagnoli, Andrea Carpinteri, Daniele Ferretti, Sabrina Vantadori
Volume 39, Issue 8, August 2016, Pages 956–968