fig8

Figure 8. Flexible films with multi-directional stretchable Kirigami patterns. (A) Kirigami sheet with stress-strain characteristics programmed based on the parameters of the cut patterns and the thickness of the film. Reproduced with permission^[73]. Copyright 2019, Wiley-VCH; (B) Pneumatic actuator with pre-programmed motion capabilities using a composite Kirigami-patterned substrate. Reproduced with permission^[74]. Copyright 2021, Khosravi, Iannucci and Li; (C) Mechanical deformation of Kirigami sheets resulting from various combinations of cut patterns on a square flexible sheet. Reproduced with permission^[75]. Copyright 2017, American Physical Society; (D) Tensile deformation of Y-cut PET film and application of a textile sensor patch, developed based on the designed film, to a bent elbow. Reproduced with permission^[76]. Copyright 2019, Association for Computing Machinery. PET: Polyethylene terephthalate.