Preparing the Standardization of the In-Plane Torsion Test

Funding: AiF/FOSTA
Project: 21137 N/P1320
Contact: Fabian Stiebert M. Sc.

The in-plane torsion test (IPTT) is a material characterization method which can determine flow curves under pure shearing up to high degrees of deformation.

In order to enable a broader industrial use of the IPTT, a standardization of the test procedure needs to be established and a test specification has to be prepared. For this purpose, the influence of different process parameters as well as the influence of the sample manufacturing and sample geometry on the test results will be investigated. Based on these results, suitable test conditions for a standardized test procedure will be defined. By an analytical examination of smooth clamping surfaces it can be shown that when using the same clamping force an annular clamping surface can increase the transmittable torque compared to a full clamping surface. However, due to the machine-related limitation of the clamping force, this torque is not sufficient to test materials up to high strains without slipping. For this reason, different clamping surface geometries are examined in a further step with regard to their suitability.

Test setup and influences on the results of the in-plane torsion test