Abstract
The maximum opening stress and minimum energy density criteria were adopted and modified in order to predict the path of a crack at the interface of two homogeneous, isotropic and elastic solids. The results obtained from the analytical (elastic) solution are compared with these from a FEM analysis (elastic-plastic case) but only for the maximum opening stress criterion. The elastic-plastic analysis revealed that crack advance along the interface is dictated from a combination of critical normal and shear stresses. Experimental data for the Si3N4)Fe/Si3N4 system support this result and indicate the limitation of the elastic solution. For the case of crack advance in one of the two adjacent materials, the comparison between analytical and numerical results has revealed similar values for the crack propagation angle. Comparison of the two criteria with experimental data taken from the Si3N4/Fe/Si3N4 system shows very good agreement between theory and experiment.
Work carried out within the Commission research and development programme.
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Stamos, V., Kostopoulos, V., Peteves, S.D. (1998). Fracture Criteria for Interface Cracks. A Case Study. In: Bellosi, A., Kosmač, T., Tomsia, A.P. (eds) Interfacial Science in Ceramic Joining. NATO ASI Series, vol 58. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1917-9_23
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DOI: https://doi.org/10.1007/978-94-017-1917-9_23
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