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학술저널
저자정보
Carpinteri, Alberto (Department of Structural Engineering and Geotechnics, Politecnico di Torino) Cornetti, Pietro (Department of Structural Engineering and Geotechnics, Politecnico di Torino) Pugno, Nicola (Department of Structural Engineering and Geotechnics, Politecnico di Torino) Sapora, Alberto (Department of Structural Engineering and Geotechnics, Politecnico di Torino) Taylor, David (Department of Mechanical and Manufacturing Engineering, Trinity College)
저널정보
테크노프레스 Structural engineering and mechanics : An international journal Structural engineering and mechanics : An international journal 제32권 제5호
발행연도
2009.1
수록면
609 - 620 (12page)

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In this paper the results of a series of experimental tests upon three-point bending specimens made of polystyrene and containing re-entrant corners are firstly described. Tests involved different notch angles, different notch depths and finally different sizes of the samples. All the specimens broke at the defect, as expected because of the material brittleness and, hence, the generalized stress intensity factor was expected to be the governing failure parameter. Recorded failure loads are then compared with the predictions provided by a fracture criterion recently introduced in the framework of Finite Fracture Mechanics: fracture is assumed to propagate by finite steps, whose length is determined by the contemporaneous fulfilment of energy balance and stress requirements. This fracture criterion allows us to achieve the expression of the generalized fracture toughness as a function of the tensile strength, the fracture toughness and the notch opening angle. Comparison between theoretical predictions and experimental data turns out to be more than satisfactory.

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