Indentation limit for the bending process from design point of view: • The upper limit for indentation depth is max. 0.5mm based on the limit for continuous undercuts No. 1.7 acc. to EN 5817, ref./27/. Additionally, there shall be a smooth surface transition from the indentation to the unaffected material. • The requirements with respect to plastic strain (see below for the total sum and above for the plastic strain resulting from the indentation) and limits for fabrication shall be fulfilled and might lead to stricter limits for the max. depth of the indentation than from design point of view.