In wrench moment axis design

material mechanics theory is usually applied

which leads to actual failure torque far lower or higher than the design value and causes the wrench moment axis to fracture in safety zone or still work beyond safety zone.The mining wrench moment axis is designed by applying the elastic mechanics

mechanics of elasticity and plasticity with the help of FEM in order to make the design failure torque more close to the actual failure torque and improve the precision of design failure torque.The reliability of the design results is further validated by the torque experiment.