Influence of Residual Stresses on Threshold Values for Crack Propagation Through an Interface Between Two Materials

Abstract:

The article deals with the behaviour of a fatigue crack propagating across a bi-material interface. A stability criterion for the crack touching the bi-material interface, taking into account the residual stresses closing the crack faces is formulated. The linear elastic fracture mechanics is assumed to apply and the finite element method is used in the calculations. The criterion proposed is applied to determine the fatigue threshold stress for crack propagation across the interface. It is shown that the threshold values for crack propagation are influenced by the residual stresses closing the crack and by the specific combination of the elastic constants of the materials used. The results contribute to a better understanding of the failure of structures with bi-material interfaces (protective layers, composite materials, etc.).

• Periodical: Key Engineering Materials (Volumes 324-325)
• Pages: 1153-1156
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.324-325.1153
• Online since: November 2006
• Authors: Luboš Náhlík, Pavel Hutař, Zdeněk Knésl
• Keywords: Bi-Material Interfaces, Critical Stress, Plasticity-Induced Crack Closure, Residual Stress

References

[1] K.Y. Lin and J.W. Mar: Int. Journal of Fracture, 12 (1976), p.52.

[2] S.A. Meguid, M. Tan and Z.H. Zhu: Int. Journal of Fracture, 73 (1995), p.1.

[3] Z. Knésl: Int. Journal of Fracture, 48 (1991), p. R79.

[4] Z. Knésl, L. Náhlík and J. C. Radon: Comput. Mater. Science 28 (2003), p.620.

[5] W. Elber: Engng. Fracture Mechanics, 2 (1970), p.37.