NON-TRADITIONAL BENDING TESTS ON A HOT DIP ZINC COATED STEEL PLATE:KINEMATIC AND STATIC MECHANISM CHARACTERISATION AND COATINGS DAMAGING IDENTIFICATION

摘要

The aim of this work was the analysis of the hot dip zinc coated steel plates mechanical properties by means of a non-tradition bending test performed minimizing both the bending moment differences along the bending axis and the interactions between the clamping system and the specimen coating.A complete kinematic and static mechanism analysis was performed. All the kinematic and static variables were identified in order to completely characterise the specimen deformation mechanism and the stress level. Bending tests were performed both on non-coated and on hot dip zinc coated plates, correlating the measured variables (applied load and crosshead displacement) with the bending moment and the specimen bending angle. Tests are characterised by a good repeatability. Results show a crosshead displacement - load diagrams that depend on the main deformation mechanisms. Furthermore, the mechanical behaviour was influenced by the coating thickness. It can be seen throught the load values increase and the crosshead displacement - load diagram modification.