For a reliable, strength-compliant and fracture-resistant design of
components and technical structures and for the prevention of damage
cases, both the criteria of strength calculation and fracture mechanics
are essential. Thereby, the comparison of the effective load with
strength parameters enables the prevention of strength failure. In
contrast, fracture mechanical failure is caused by defects and cracks
which initiate and/or propagate under the operational load. The present
paper illustrates the general procedure of a fracture mechanical
evaluation of fatigue cracks in order to evaluate practical damage
cases. Fracture mechanical fundamentals which are essential for the
calculation of the stress intensity factors K
and the experimental determination of fracture mechanical material
parameters (e.g. threshold Δ K against
fatigue crack growth, crack growth rate curve) are explained in detail.
The subsequent fracture mechanical evaluation on the basis of the local
stress situation at the crack tip and the fracture mechanical material
data is executed for different materials (e. g. HCT590X) and selected
crack problems.
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