General size effect on strength of bimaterial quasibrittle structures |
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Authors: | Jia-Liang Le |
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Affiliation: | (1) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.;(2) Department of Mechanics, Lanzhou University, Lanzhou, People's Republic of China |
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Abstract: | This paper presents a general size effect equation for the strength of hybrid structures, which are made of two dissimilar
quasibrittle materials with a thin and weak bimaterial interface. Depending on the material mismatch and structure geometry,
a singular stress field could occur at the bimaterial corner. For structures with strong stress singularities, an energetic
size effect is derived based on the equivalent linear elastic fracture mechanics and asymptotic matching. For structures without
stress singularities, a finite weakest link model is adopted to derive the size effect. A general scaling equation that bridges
the limits of strong and zero stress singularities is formulated by combining the energetic scaling of fracture of the bimaterial
corner and the finite weakest link model. |
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Keywords: | |
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