Abstract
A front-tracking finite element method is used to compute the evolution of a crack-like defect that propagates along a bi-material interface by stress driven corrosion. Depending on material properties, loading, and temperature, simulations predict five possible behaviors for the flaw: (a) The notch may blunt, so that a fatigue threshold exists for the composite; (b) The flaw may branch out of the interface, and thereafter propagate as a stable notch; (c) The notch may branch out of the interface, and then progressively sharpen at its tip, with both the notch tip curvature and stress approaching unbounded values; (d) The flaw may propagate as a stable notch parallel to the interface; (e) The notch may propagate parallel to the interface, but with the tip curvature and stress progressively increasing without limit. The range of material parameters and loading conditions that leads to each type of behavior is calculated. For conditions where steady-state interfacial notch growth occurs, the tip velocity is computed as function of material and loading.
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Tang, Z., Bower, A. & Chuang, TJ. Numerical simulations of the growth and deflection of a stress-corrosion notch on the interface between two reactive solids. International Journal of Fracture 127, 1–20 (2004). https://doi.org/10.1023/B:FRAC.0000035070.99093.77
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DOI: https://doi.org/10.1023/B:FRAC.0000035070.99093.77