Title:

Development of In-Plane Torsion Testing Fixture and Experiment for Sheet Metal

Double-sided incremental forming (DSIF) is a flexible manufacturing process used to fabricate parts from sheet metal. A sheet is clamped in a rigid frame and formed by two tools at each side with a preprogrammed path. The primary tool follows the programmed path and the secondary tool on the opposite side of the material provides support and helps reduce geometrical deviations. There is a desire to use this process for manufacturing custom biomedical implants, such as cranial plates to repair fractured skulls. For this to be successful, the plastic behavior of the metal under various stress states must be understood. There is a specific interest in characterizing shear deformation. This has been achieved in similar studies using a disc type specimen where the outer radius is twisted in-plane with respect to the center. A specimen and fixture have been designed for this study to interface with an MTS 809 Axial/Torsional Test System. The fixture is capable of testing materials with varying strengths and thicknesses. Digital Image Correlation (DIC) will be used to measure strain. Physical testing of metals including SS316L and CP-Ti will be performed, and results will be compared with finite element (FE) simulations.

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