Abstract
After a brief introduction, various fracture mechanics concepts and fracture criteria are examined and their relative merits are discussed. There are two distinct aspects of fracture in the case of several practical materials exhibiting nonlinearity. These are, crack extension and crack growth. Sih’s criterion for predicting the crack extension direction and critical fracture load can be applied for non-self-similar crack extension unlike Griffith’s criterion which was based on self-similar crack extension.
Fracture toughness testing of many practical alloys indicates that most of the effects due to plasticity can be attributed to the phenomenon of slow crack growth. Several of the proposed crack growth laws are examined in this paper and it is shown that the results obtained using the plastic energy method of Lee and Liebowitz have been successfully applied to several uniaxial and biaxial loading cases.
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© 1982 Martinus Nijhoff Publishers, The Hague
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Liebowitz, H., Lee, J.D., Subramonian, N. (1982). Concepts of Linear and Nonlinear Fracture Mechanics. In: Sih, G.C., Zorski, H. (eds) Defects and Fracture. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-7520-3_14
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DOI: https://doi.org/10.1007/978-94-011-7520-3_14
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