D1.5 Alternative tests to evaluate formability at room and high Temperature – Abstract

In the frame of the FormPlanet, Fraunhofer has develop a testing machine for the frictionless determination of modified of FLC at elevated temperatures, adapting a tensile testing machine. In this report, the strategies carried out by Fraunhofer for the development of this testing machine are described. These strategies include the definition of the requirements for the implementation, the simulation of the specimen geometry and test approach, the design/construction and calibration of the test chamber, verification of the test method for various sheet metals materials and the implementation of temperature-dependent FLC model into FE program and experimental validation.

On the other hand, two advanced tests for measuring improved FLC at room temperature with non-linear strain path have been optimized by COMTES in the project: (a) Biaxial tensile tests (using cruciform specimens) at room temperature; and (b) deep drawing tests. These tests combine the advantage of reproduce almost any linear and non-linear strain path (cruciform) and different stress and deformation state.
The cruciform specimen with necking region located at the center of the specimen was designed using FEM analysis. Uniaxial, plane strain and equi-biaxial tension experiments were performed using DIC system with 3D calibration.