What are the failure mechanisms called, if the load is sub-critical?
cyclic fatigue
static fatigue (creep)
Which shapes of sollecitation can be chosen?
Name and give the equations for the following components + the stress ratio:
How are traditional fatigue tests performed?
unnotched samples
homogenous stress
What defines the fatigue limit in a woehler curve?
The stress value below which fatigue does not occur.
What are the stress limits of a goodman diagramm?
yield stress:
What is a Haigh Soderberg diagramm and which lines exist in it?
What are the end points of the lines?
How can the stable crack growth be described mathematically?
m, C =material constants
a=crack length
How can the cycles to failure be estimated?
What is the formula for the stress intensity factor Ki?
What is the stress ratio?
How is delta K calculated for a cyclic exitation?
How is the time to failure calculated?
How is KIc calculated?
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