Uniaxial tension/compression tests and cyclic bending tests for hardening parameter identification

Paper i proceeding, 2010

An experimental method that frequently has been used for the determination of material hardening parameters is the three-point bending test. The advantage of this test is that it is simple to perform, and standard test equipments can be used. The disadvantage is that the material parameters have to be determined by some kind of inverse approach. An alternative method is the tensile/compression test of a sheet strip. In practice such a test is very difficult to perform, due to the tendency of the strip to buckle in compression. In spite of these difficulties some successful attempts to perform cyclic tension/compression tests have been reported in the literature. In an ideal world both these test approaches should result in the same material parameter set-ups. However, a few writers have reported that there are substantial differences between hardening parameters determined from bending tests and those from tensile/compression tests. These observations have been partly verified by investigations performed by the current authors.