Structural instabillity under residual stress

Especially slender and thin structures like beams and plates can suffer structural instability. Up to now buckling and bifurcation are mainly investigated under the action of external loads. But instability may also occur under proper internal loads. Those residual stresses are generated by, e.g., thermal loading or by fitting constraints. Examples of thermal loading are friction or eddy current disk brakes. Under severe conditions the residual stresses are in the plastic range and, consequently, elastic-plastic stability has to be regarded because permanent buckling happens.

The aim of the research is the development of adequate stability criteria for elastic-plastic buckling of thin structures under residual stresses and their application to the technically relevant boundary value problems.

Already considered examples are disk brakes with elastic and elastic-plastic residual stresses and with different supporting conditions as well as shrink fits with plastically pre-stressed zones.

For further information on this project in cooperation with the Deutsche Forschungsgemeinschaft please contact C. Krempaszky.