Biaxial machines are used to apply different loads on flat and rounded samples through different load transfer mechanisms, such as tension, pressure, and so on. These devices are among the modern requirements that are used to simulate the realistic loading conditions experienced by structures and mechanical parts, as it was usual to conduct mechanical tests using uniaxial equipment such as universal testing machines, and then failure theories are applied using these results to find specifications of parts Mechanical under complex stress loading conditions. 

As a result of the advancement of stress analysis methods, this led to a better understanding of the behavior of different materials under complex loading conditions and contributed to reducing the use of safety coefficients in mechanical designs. Therefore, it was necessary to find practical methods to examine the behavior of materials under these complex conditions. The biaxial examination device was one of these important ways to implement this.

The idea of ​​the device revolves around adapting the axial tensile and fatigue testing device to a biaxial testing device, as this mechanism enables the application of static and/or repetitive tensile or pressure force (fatigue) using a flat sample on two perpendicular ends of the sample at the same time with the possibility of using the device as a precedent Its custom is as a uniaxial tensioning device after lifting the mechanism.