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The key to the self-protecting behaviour is a geometric transformation of the crack shape under load, from an ellipse elongated across the loading direction to one elongated along it, which greatly reduces the stress concentration at the crack tips.
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Flaws change shape under load, cutting stress concentration at the corners
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Theodor Ackbarow et al., “Alpha-Helical Protein Networks Are Self-Protective and Flaw-Tolerant”, PLoS ONE 4, e6015 (2009), doi:10.1371/journal.pone.0006015; Abstract. Scope: Alpha-helix network model with a central crack under mode I tension
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Theodor Ackbarow, Dipanjan Sen, Christian Thaulow, Markus J. Buehler. Alpha-Helical Protein Networks Are Self-Protective and Flaw-Tolerant. PLoS ONE 4, e6015 (2009). doi:10.1371/journal.pone.0006015
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We show that the key for these self protecting properties is a geometric transformation of the crack shape that significantly reduces the stress concentration at corners.
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