Reliability assessment of a bi-material notch: Strain energy density factor approach |
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Authors: | Jan Klusák Zdeněk Knésl |
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Institution: | Institute of Physics of Materials, Academy of Sciences of the Czech Republic, ?i?kova 22, 616 62 Brno, Czech Republic |
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Abstract: | Joints of different materials have many applications in structural engineering and microelectronics. In the present contribution the joint is modelled as a bi-material notch. The singular stress field near the notch tip is investigated. Depending on the notch geometry and materials, the stress field can have one or two singularities. It is shown that to study the problem of a crack onset at the notch, both terms have to be taken into account. Criteria for the direction and for crack nucleation are formulated. The approach utilizes the knowledge of the strain energy density factor distribution in a bi-material notch vicinity. |
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Keywords: | Bi-material interface Notch General singular stress concentrator Stability criterion Strain energy density |
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