Development and testing of PMTSMC tensile, torsional, and bending single and composite forming test device

Mechanical testing can elucidate the relationship between material structure and guide the manufacturing process, yet the existing molding process apparatus often lacks sufficient integration of testing conditions, making it challenging to meet the demands of composite working environments. In this study, we developed a comprehensive set of molding test equipment capable of accommodating multiple mechanical load combinations to ascertain the elastic-plastic deformation behavior during the molding process. The testing apparatus comprises components for tension, torsion, and bending, and, through a modular structural design and an integrated communication network, it facilitates multi-mechanical load operations and multi-physical quantity control. This system enables the execution of molding tests under five distinct single or composite loading conditions and allows for the real-time collection of data pertaining to six physical quantities. We conducted test verification using the material from the permanent magnet traction motor stator coil of the China railway high-speed moving train (CR450). The results indicate that the comparative analysis error for individual tests remains within 7%, thereby ensuring the validity of the measurement data. Notably, in the stretching-bending composite condition tests, we observed a decrease in bending force and an increase in bending rebound following tensile loading. In the torsion-bending tests, both the bending force and rebound amount remained largely unchanged after torque application. This device offers valuable insights and mechanical testing support for the development of complex molding process apparatus for both metallic and non-metallic materials.