Introduction to Multiaxial Fatigue Analysis

Most structures are prone to local multiaxial stress or strain states. Estimation of durability gets even more difficult, if non-proportional stresses are present.

The seminar starts with an introduction to basics of multiaxial fatigue including handling of three dimensional stress or strain states. Transformation of stress states in rotated coordinate systems is necessary to use different multiaxial fatigue theories together with finite element models.

In case of low-cycle fatigue, plasticity models are necessary to calculate the multiaxial stress-strain behaviour in notches. Basic understanding of multiaxial plasticity effects, i.e. different effects of hardening, is covered as well. The quality of a very simple plasticity model and an overview about available plasticity models in finite element software will be explained.

Estimating multiaxial fatigue data will also be discussed using different examples.

Different stress, strain and energy-based parameters for the estimation of damage as well as techniques to handle multiaxial stress-strain behaviour will be introduced. Critical plane, integral methods or incremental fatigue methods will be presented as an overview to give an ideal about the large amount of methods from multiaxial fatigue research. A demonstration on the performance of some selected parameters with respect to multiaxial low cycle problems including the elastic-plastic notch-strain analysis will finish this chapter.

Multiaxial fatigue counting requires special methods compared to uniaxial cycle count. Some alternatives will be presented. Examples on multiaxial fatigue as handled in commercial codes will finish up this lecture.

Agenda:

Introduction to Multiaxial Fatigue

• Effects and Consequences
• Multiaxial Stress and Strain
• Plasticity Models
• Cycle Counting
• Selected Damage Parameters (Stress, Strain and Energy Based Concepts)

Dier Kursunterlagen werden in deutscher bzw. englischer Sprache zur Verfügung gestellt.
Für alles ACENTISS Academy Kurse gelten die speziellen AGB'S und die AGB's der ACENTISS GmbH. Diese sind auf der Internetseite zu finden.
Die Mindestanzahl pro Kurs beträgt 3 Personen, die maximale Teilnehmeranzahl beträgt 10 Personen.
Die Kurspreise erhalten Sie auf Anfrage.