PSI - Issue 13

Katharina Dibblee et al. / Procedia Structural Integrity 13 (2018) 322–327 Katharina Dibblee et al./ Structural Integrity Procedia 00 (2018) 000 – 000

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Fig. 5. Lifetime prediction for an induction hardened cog wheel compared to a cog wheel with homogeneous material properties

4. Conclusion

The crack growth simulations presented here show that fracture mechanical material grading in the component has a significant influence on the crack propagation behaviour. In addition to the stresses prevailing at the crack front, it is essential to take into account the locally varying material properties and the local material grading limit in relation to the gradation orientation to crack growth direction. Only by observing these conditions it is possible to make a realistic, safe design of fracture-graded structures.

References

ASTM, 2008. Annual book of ASTM standards. Section 3: Metals test methods and analytical procedures, Volume 03.01. Metals - Mechanical testing,elevated and low-temperature tests. Metallography, E 647-08. Brill, S., Schibisch, D.M., 2014. Induktives Härten versus Einsatzhärten – ein Vergleich. In: Elektrowärme International, Fachbericht 3, pp. 67-75. Fulland, M., 2003. Rißsimulationen in dreidimensionalen Strukturen mit automatischer adaptiver Finite-Elemente-Netzgenerierung. Fortschritt Bericht VDI, Reihe 18: Mechanik/Bruchmechanik, Volume 280, VDI-Verlag, Düsseldorf. Schöllmann, M., Richard, H.A., Kullmer, G., Fulland, M., 2002. A new criterion for the prediction of crack development in multiaxially loaded structures. In: International Journal of Fracture, Volume 117, pp. 129-141. Schramm, B., 2014. Risswachstum in funktional gradierten Materialien und Strukturen. Fortschritt-Bericht VDI, Reihe 18: Mechanik /Bruchmechanik, Volume 339, VDI-Verlag, Düsseldorf. Schramm, B., Richard, H.A., Kullmer, G., 2016. Theoretical, experimental and numerical investigation crack growth in fracture mechanical graded structures. In: Engineering Fracture Mechanics, Volume 167, pp. 188-200.