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Part of the book series: Engineering Application of Fracture Mechanics ((EAFM,volume 5))

Abstract

Preliminary remarks. One of the major problems in analyzing the strength of materials is the so-called ‘size effect’. Despite the numerous research efforts, this effect is still not completely understood. Two important aspects of size effects are:

  1. (1)

    Uncracked structures show an increase in brittleness when their size is increased, and

  2. (2)

    Notched (or cracked) structures become less sensitive to the presence of mechanical imperfections when their size is decreased and they tend to behave in a more ductile fashion.

These two effects have been known for a long time, but it is only recently that a consistent explanation could be given in terms of Fracture Mechanics concepts. The two fundamental failure modes known classically are brittle fracture and plastic collapse both of which may occur depending on the combination of the load and geometric variables. Although Plastic Limit Analysis can be applied to treat the failure of structures due to excessive distortion and Linear Elastic Fracture Mechanics to the onset of rapid fracture, both of these disciplines apply only at the global scale level. They cannot address failure by yielding and fracture [1–9] that is the rule in practice rather than the exception.

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Carpinteri, A. (1986). Fracture testing and design. In: Mechanical damage and crack growth in concrete. Engineering Application of Fracture Mechanics, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4350-6_8

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  • DOI: https://doi.org/10.1007/978-94-009-4350-6_8

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