fig2

Figure 2. (A) The influence of different bending angles θ and curvature radius R on compressive strain in flexible devices. (B) The flexibility tests conducted by commercial leather and fabric softness testers^[23]. Copyright 2019, Elsevier. (C) Quantify strain through clamp measurement^[24]. Copyright 2023, Elsevier. (D) Electrochemical measurement with different stretching ratios controlled by clamps^[25]. Copyright 2020, Wiley.