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Illustrations of different bond-strength testing methods. (a) Tensile strength measurement with adhesive. (b) Cylinder-based tensile strength measurement with a specially designed PDMS piece. (c) Double-substrate bonding-based tensile strength measurement. (d) String-based tensile strength measurement. (e) Pushing-based shear strength measurement. (f) Pulling-based shear strength measurement. (g) Peeling test. (h) T-peeling test. (i) Leakage test. (j) Burst test.
