Asymmetric crack wake plasticity – a reason for roughness induced crack closure

• Published in: Acta materialia Vol. 52; no. 15; pp. 4493 - 4502
• Main Authors: Pippan, R, Strobl, G, Kreuzer, H, Motz, C
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 06-09-2004; Elsevier Science
• Subjects: Condensed matter: structure, mechanical and thermal properties; Electron backscattering diffraction; Exact sciences and technology; Fatigue crack propagation; Fatigue, brittleness, fracture, and cracks; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Roughness induced crack closure; Electron backscattering diffraction; Fatigue crack propagation; Roughness induced crack closure; Grain size; Crystal orientation; Roughness; Crack closure effect; Theoretical study; Mechanical properties; Iron; Experimental study; Dislocations; Fracture surfaces; Plasticity; Crack tip; Property structure relationship; Copper
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2004.06.014

Asymmetric arrangement of geometrically necessary dislocations in the wake of a crack tip induces a mismatch of fracture surfaces. It can explain the occurrence of the roughness induced crack closure far behind the fatigue crack tip. The asymmetric arrangement of geometrically necessary dislocations is verified by local crystal orientation measurements on fatigue crack in the near threshold regime in Cu and Fe.