Third party funded individual grant
Acronym: Mass-Presshärten
Start date : 01.12.2024
End date : 30.11.2026
Failure under plane strain represents a critical condition in sheet metal forming due to the occurring minimum of formability. The failure characteristics are traditionally determined using the Nakajima test. This test is friction-induced and exhibits biaxial pre-stretching of the strain paths. The hydraulic bulge test with an elliptical die (HBTe) offers the possibility to compensate these disadvantages and thus achieving a higher accuracy in failure prediction. Accordingly, several configurations of elliptical dies were investigated and the influence of the geometric design parameters on the plastic material behavior was analyzed. Based on this, a dimensioning window was derived for the generation of a strain path with the most ideal plane strain possible.
Failure under plane strain represents a critical condition in sheet metal forming due to the occurring minimum of formability. The failure characteristics are traditionally determined using the Nakajima test. This test is friction-induced and exhibits biaxial pre-stretching of the strain paths. The hydraulic bulge test with an elliptical die (HBTe) offers the possibility to compensate these disadvantages and thus achieving a higher accuracy in failure prediction. Accordingly, several configurations of elliptical dies were investigated and the influence of the geometric design parameters on the plastic material behavior was analyzed. Based on this, a dimensioning window was derived for the generation of a strain path with the most ideal plane strain possible.