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. 2020 Aug 26;6(35):eabc0496. doi: 10.1126/sciadv.abc0496

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Strain component E₂ versus distance from the crack y. (B) E₂ at 100 μm from the crack tip when Δ = Δ_c. We compute the average of the data to conclude that the critical strain is 1.04. (C) Crack tip opening angle was determined using the ImageJ angle tool for measurement, where the angle was approximated at the center of the crack tip right before the onset of rupture (critical strain).