Temperature-dependence mechanical characteristics investigation of Cu wire and corresponding high strain rate plasticity behaviors enabled by Johnson-Cook constitutive model

The temperature-dependence mechanical characteristics of 4N Cu wire with 25, 30 and 38 mu m diameters are investigated via the utilization of micro-tensile tests. Measured data revealed that the concerned mechanical characteristics, Young's modulus and yield stresses, are significantly degraded under high testing temperature, and the variation of aforementioned characteristics degradation are almost linear proportional to the temperature increment. Trapezoidal and standard triangle loop formation of Cu wire are simulated based on the finite element method, the simulated looping profiles of Cu wires are compared to the Au wires and the Cu wire is regarded as the improved solution for the high loop height wire formation. Moreover, the Johnson-Cook constitutive model is utilized to describe the plasticity of Cu wire in accordance with the experimental data under different temperature levels. Accordingly, the comprehensive mechanical characteristics' investigation of 4N Cu wire are systemically demonstrated and explored.