Magic Angles and Cross-Hatching Instability in Hydrogel Fracture

by: T Baumberger, C Caroli, D Martina, O Ronsin

Physical Review Letters, Vol. 100, No. 17. (2008)

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Abstract

The full 2D analysis of roughness profiles of fracture surfaces resulting from quasistatic crack propagation in gelatin gels reveals an original behavior characterized by (i) strong anisotropy with maximum roughness at V-independent symmetry-preserving angles and (ii) a subcritical instability leading, below a critical velocity, to a cross-hatched regime due to straight macrosteps drifting at the same magic angles and nucleated on crack-pinning network inhomogeneities. Step height values are determined by the width of the strain-hardened zone, governed by the elastic crack blunting characteristic of soft solids with breaking stresses much larger than low strain moduli.

@article{citeulike:2759114, abstract = {The full 2D analysis of roughness profiles of fracture surfaces resulting from quasistatic crack propagation in gelatin gels reveals an original behavior characterized by (i)\ strong anisotropy with maximum roughness at V-independent symmetry-preserving angles and (ii)\ a subcritical instability leading, below a critical velocity, to a cross-hatched regime due to straight macrosteps drifting at the same magic angles and nucleated on crack-pinning network inhomogeneities. Step height values are determined by the width of the strain-hardened zone, governed by the elastic crack blunting characteristic of soft solids with breaking stresses much larger than low strain moduli.}, author = {Baumberger, T. and Caroli, C. and Martina, D. and Ronsin, O. }, citeulike-article-id = {2759114}, doi = {10.1103/PhysRevLett.100.178303}, journal = {Physical Review Letters}, keywords = {defect, gel, interface, structure}, number = {17}, posted-at = {2008-05-05 21:22:46}, priority = {2}, publisher = {APS}, title = {Magic Angles and Cross-Hatching Instability in Hydrogel Fracture}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000100000017178303000001\&idtype=cvips\&gifs=yes}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2759114 TI - Magic Angles and Cross-Hatching Instability in Hydrogel Fracture JF - Physical Review Letters VL - 100 IS - 17 PB - APS N2 - The full 2D analysis of roughness profiles of fracture surfaces resulting from quasistatic crack propagation in gelatin gels reveals an original behavior characterized by (i) strong anisotropy with maximum roughness at V-independent symmetry-preserving angles and (ii) a subcritical instability leading, below a critical velocity, to a cross-hatched regime due to straight macrosteps drifting at the same magic angles and nucleated on crack-pinning network inhomogeneities. Step height values are determined by the width of the strain-hardened zone, governed by the elastic crack blunting characteristic of soft solids with breaking stresses much larger than low strain moduli. KW - defect KW - gel KW - interface KW - structure AU - Baumberger, T AU - Caroli, C AU - Martina, D AU - Ronsin, O PY - 2008/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000100000017178303000001&idtype=cvips&gifs=yes ER -

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