Fracture mechanical evaluation of the material HCT590X

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. In contrast to strength calculation the fracture mechanics assumes the existence of cracks which might further propagate due to the operational load. First, the present paper illustrates the general procedure of a fracture mechanical evaluation of fatigue cracks in order to assess practical damage cases. Fracture mechanical fundamentals which are essential for the calculation of the stress intensity factors K-I and the experimental determination of fracture mechanical material parameters (e.g. threshold Delta K-I,K-th 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 and selected crack problems. Hereby, the main focus is on the material HCT590X as it is the essential material being investigated by TRR285.

Automated summary

Strength calculation and fracture mechanics are essential for reliable, strength-compliant and fracture-resistant design, as well as prevention of damage cases. This paper explains the general procedure of fracture mechanical evaluation for fatigue cracks and provides detailed explanations of fracture mechanical fundamentals for stress intensity factor calculation and experimental determination of material parameters. Fracture mechanical evaluation is conducted for different materials and selected crack problems, with a focus on material HCT590X being investigated by TRR285.