Uniaxial High Strain Rate Tension Method Using Pulsed Magnetic Pressure
摘要
The mechanical properties of the materials depend on strain rate and there are various methods for testing mechanical properties with different strain rates. In this work we consider uniaxial high strain rate tension methods using pulsed magnetic pressure as a source of mechanical impact. In these methods pulse current generators (PCG) is discharged onto the magnetic system creating strong magnetic field. The geometry of magnetic system in the first method is a spiral coil near conductive disk connected to the sample, the other consist of flat closely spaced copper conductors that are placed inside gaps of the samples. Experiments were performed and finite element modelling was done. Pulsed magnetic field and pressure of the magnetic systems were calculated in the Comsol Multiphysics environment. Dynamic mechanical deformation of the samples is calculated in ANSYS AutoDyn software. Experiments were done on the oxygen-free high thermal conductivity (OFHC) copper and TiNi samples with strain rates in the range of 2000–7000 1/s. Registration of the deformation process using high speed camera or laser with photodetector were done. Modifications of the uniaxial tension using flat conductors, which allow to simplify analysis of the results and the preparation of the samples were made.