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Finite element (FE) simulations of membrane size effect on the uniformity of the stretch. Tensile strain fields (a) and (b) and extracted stretch ratio (c) within a 40 mm × 40 mm PDMS membrane. Tensile strain fields (d) and (e) and extracted stretch ratio (f) within a 40 mm × 20 mm PDMS membrane. Tensile strain fields (g) and (h) and extracted stretch ratio (i) within a 40 mm × 14 mm PDMS membrane. The data plot path is 14 mm along the middle of membrane.
