Roughening of Fracture Surfaces: the Role of Plastic Deformations

Details Roughening of Fracture Surfaces: the Role of Plastic Deformations Roughening of Fracture Surfaces: the Role of Plastic Deformations

2003-12-28

arxiv.org/abs/cond-mat/0312669v1

Physics

Condensed Matter

Materials Science

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.92.245505

Post mortem analysis of fracture surfaces of ductile and brittle materials on the $\mu$m-mm and the nm scales respectively, reveal self affine graphs with an anomalous scaling exponent $\zeta\approx 0.8$. Attempts to use elasticity theory to explain this result failed, yielding exponent $\zeta\approx 0.5$ up to logarithms. We show that when the cracks propagate via plastic void formations in front of the tip, followed by void coalescence, the voids positions are positively correlated to yield exponents higher than 0.5.

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