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. 2023 Mar 3;9(9):eade7375. doi: 10.1126/sciadv.ade7375

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Fig. 5. — (A) The stress-stretch curve. (B) Snapshots of a membrane with a precut in four states of deformation. (C) A polarized light micrograph of the crack tip. (D) The resistance curve. (E) Contours of strain E_YY observed using DIC. Both BP and TPU are imaged for comparison. (F) The concentration factor of strain E_YY at distance X from the crack tip measured in the undeformed state. In the fracture test, the number of samples, n = 3. Thickness of samples, t = 0.31 ± 0.04 mm (means ± SD).