Abstract
The cracking-limit curves and the flaking-limit curves for both linear and complex strain paths have been determined experimentally for polyethylene-, acryl- and PVC-coated steel sheets. The complex strain paths were realized in such way that in the first step of deformation the specimens were in the in-plane condition and during the second step in the out-of-plane condition. It has been found that the cracking-limit curves and the flaking-limit curves are influenced by the strain paths. The height of the cracking-limit curves decreases as the strain ratio ϵ2/ϵ1 increases, whilst the flaking-limit curves are almost the same as the FLDs of the bare (uncoated) steel. The cracks in the zinc layer are nucleated mainly as inter-crystalline and are usually perpendicular to the major-strain direction.
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