Stretchable electronic devices are desirable for the next application of electronic devices such as stretchable sensors, stretchable energy storage devices, and humanmachine interfaces. Also, stretchable electronic systems require a stretchable metal circuit on the elastomeric substrate for electrical connection to components. The stretchable circuits fabricated by Cu foil lamination on the thermoplastic polyurethane (TPU) film are investigated with various zigzag-patterned circuit designs. The various circuit designs are simulated by finite element analysis (FEA) for fatigue life prediction and the simulation results are compared with experimental results. The 6 types of zigzag-shaped circuit designs with different corner patterns are investigated. The thicknesses of the Cu electrode and TPU substrate are 18 μm and 50 μm, respectively. The stretchability of Cu stretchable circuits is evaluated by the uniaxial tensile test with 10% elongation. Also, the equivalent plastic strain is calculated for fatigue life prediction. The number of stretch cycles to failure increased as decreasing the equivalent plastic strain obtained by FEA. The tendency of crack propagation and fatigue life prediction are well agreed with FEA results. Thus, it is considered that modifying the circuit patterns of the strain concentration area is the most important to enhance the mechanical reliability of stretchable circuits.

可伸缩电子设备对于诸如伸缩传感器，可伸缩能量存储设备和人机界面之类的电子设备的下一个应用是期望的。而且，可拉伸的电子系统需要在弹性体基底上具有可拉伸的金属电路，以电连接到部件。通过各种锯齿形电路设计研究了通过铜箔层压在热塑性聚氨酯（TPU）薄膜上制造的可拉伸电路。通过有限元分析（FEA）对各种电路设计进行仿真，以预测疲劳寿命，并将仿真结果与实验结果进行比较。研究了具有不同拐角图案的6种之字形电路设计。Cu电极和TPU基板的厚度分别为18μm和50μm。通过具有10％伸长率的单轴拉伸试验评价Cu可拉伸电路的可拉伸性。同样，计算等效塑性应变以预测疲劳寿命。延伸至破坏的循环次数随着减少FEA获得的等效塑性应变而增加。裂纹扩展趋势和疲劳寿命预测与有限元分析结果完全吻合。因此，认为改变应变集中区域的电路图案对于增强可拉伸电路的机械可靠性是最重要的。裂纹扩展趋势和疲劳寿命预测与有限元分析结果完全吻合。因此，认为改变应变集中区域的电路图案对于增强可拉伸电路的机械可靠性是最重要的。裂纹扩展趋势和疲劳寿命预测与有限元分析结果完全吻合。因此，认为改变应变集中区域的电路图案对于增强可拉伸电路的机械可靠性是最重要的。