Astani Dept Seminar: Scaling of Fracture in Quasibrittle Structures

March 8, 2011 Qiang Yu Northwestern University Abstract: Quasibrittle Materials, which include concrete, fiber composites, tough ceramics, bone and many other engineering materials, are widely used in the fields of civil engineering, aerospace engineering, mechanical engineering and bio-engineering. A salient feature of quasibrittle material is that its constituents are brittle and, due to heterogeneity, its fracture process zone is not negligible compared with the structure size. The consequence is that the structure strength (nominal stress at failure) is size dependent. Statistical studies showed that if size effect is ignored in concrete design, the failure probability may increase by orders of magnitude, eg, from 10-6 to 10-3. Therefore, the proper scaling of quasibrittle structure strength is of great importance for structural safety and reliability.In this study, the scaling of fracture in shear of RC beams, at reentrant corners, and in metal-composite hybrid joints is investigated theoretically, experimentally, and numerically.



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