Lecture by P. Yadegari on “Fatigue strength of ultra-high strength steels and surface-hardened components”

Lecture by Patrick Yadegari on “Fatigue strength of ultra-high strength steels and surface-hardened components” will be held on-line on Tuesday September 5 at 3PM CET. Its approximate duration is expected 1 hour, but it will depend on the scope of the discussion and the questions of participants. If you wish to take part, please write me to papuga@pragtic.com, so that I could send you the access link to the Zoom platform. Here is the abstract to the lecture:

This presentation will discuss how the methods of the German “FKM-Guideline Nonlinear”, which provides a fatigue strength assessment based on the local strain approach, are extended to be applicable for ultra-high strength steels as well as for surface-hardened components. Various experimental investigations were used to adapt the methods of the guideline to estimate the cyclic material behaviour of higher strength steels, thus allowing the estimation of the cyclic stress-strain curve, mean-stress sensitivity and damage parameter life curves based on ultimate tensile strength. Furthermore, an approach was developed to allow an assessment of structural durability for surface hardened components with regards to the existing procedures of the guideline. Since the failure of these components can originate from both the notch root and the transition area between the low-strength core material and the high-strength surface layer due to the inhomogeneous material properties and the residual stresses present, the proof of structural durability was extended to include a so-called two-point assessment and the consideration of residual stresses.

Similarly to the previous lecture by C. Liang (see the link here: https://www.pragtic.com/lectures.php), the lecture will also be recorded for those who cannot attend at this specific moment.