Numerical Modelling of Plasticity Induced Crack Closure with Rough Fracture Surfaces

Abstract:

A two-dimensional elastic-plastic finite element model was built to simulate the closure of a long fatigue crack with arbitrarily shaped crack faces. The model growth is simulated by the successive mesh splitting along the crack path defined by element edges. To obtain a realistic morphology of the fracture surface, fatigue crack growth experiments with CT specimen made from AISI 304 stainless steel were performed and fracture surface topology was determined using a single camera and a depth-from-focus method. Simulated closing loads and closure lengths for the cracks with rough and smooth faces and for plane-stress and plane-strain conditions are compared. A mismatch of rough crack faces, resulting in an additional contact, is visualized.

• Periodical: Key Engineering Materials (Volume 827)
• Pages: 7-12
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.827.7
• Online since: December 2019
• Authors: Aleš Materna*, Hynek Lauschmann, Jan Ondráček
• Keywords: AISI 304 Steel, Crack Profile, Depth from Focus, Fatigue Crack Growth, FEM, Roughness Induced Crack Closure

References

[1] K.-Y. Jhang: Int. J. Precis. Eng. Manuf., Vol. 10 (2009), p.123–135.

[2] W. Elber: Eng. Fract. Mech., Vol. 2 (1970), p.37–45.

[3] K. Minakawa and A. J. McEvily: Scr. Metall., Vol. 15 (1981) p.633–636.

[4] R. Pippan and A. Hohenwarter: Fract. Eng. Mater. Struct., Vol. 40 (2017), p.471–495.

[5] P. Grossmann: Pattern Recognit. Lett., Vol. 5 (1987), p.63–69.

[6] Y.-C. Chiou: J. Mar. Sci. Tech., Vol. 18 (2010), p.122–129.

[7] R.C. McClung and H. Sehitoglu: Eng. Fract. Mech., Vol. 33, p.237–252.