Abstract
This paper presents two main results. The first result indicates that in materials with broadly distributed microscopic heterogeneities, the fracture strength distribution corresponding to the peak load of the material response does not follow the commonly used Weibull and (modified) Gumbel distributions. Instead, a lognormal distribution describes more adequately the fracture strengths corresponding to the peak load of the response. Lognormal distribution arises naturally as a consequence of multiplicative nature of large number of random distributions representing the stress scale factors necessary to break the subsequent “primary” bond (by definition, an increase in applied stress is required to break a “primary” bond) leading up to the peak load. Numerical simulations based on two-dimensional triangular and diamond lattice topologies with increasing system sizes substantiate that a lognormal distribution represents an excellent fit for the fracture strength distribution at the peak load. The second significant result of the present study is that, in materials with broadly distributed microscopic heterogeneities, the mean fracturestrength of the lattice system behaves as \(\mu _f = \tfrac{{\mu _{_f }^* }} {{(LogL)^\psi }} + \tfrac{c} {L}\), and scales as \(\mu _f \approx \tfrac{1} {{(LogL)^\psi }}\) as the latticesystem size, L, approaches infinity.
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Received: 4 August 2003, Published online: 19 February 2004
PACS:
62.20.Mk Fatigue, brittleness, fracture, and cracks - 46.50. + a Fracture mechanics, fatigue and cracks
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Nukala, P.K.V.V., Simunovic, S. Scaling of fracture strength in disordered quasi-brittle materials. Eur. Phys. J. B 37, 91–100 (2004). https://doi.org/10.1140/epjb/e2004-00033-1
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DOI: https://doi.org/10.1140/epjb/e2004-00033-1