Torsion test
A test method where rod-shaped material specimens are twisted by a moment about their longitudinal axis. It determines shear strength and twisting behavior under torsional load.
Physical-Chemical Mechanism of Action
During the torsion test, a specimen is twisted around its longitudinal axis, creating stresses. These stresses can be distributed along the entire specimen and affect material behavior under shear loading.
Metallurgical Relevance & Welding Risks
The torsion test is important for determining the shear strength of a material. Too low a value can lead to cracks or deformation, while too high a value can overstress the material and lead to fractures. In welding, it is crucial that the stresses in the microstructure are not too high, as this could impair strength.
Workshop Practice & Instructions
A special machine is used for the torsion test that can measure the torque and rotation of the specimen. Specimens should be made from the same material as the final component. It is important that the specimens are properly prepared and mounted to obtain accurate results. When welding, the material should be handled so that it is not overstressed, which can be ensured by careful selection of the welding process and parameters.