Forming of metals induces void evolution. Voids lead to a loss of bearing capacity, referred to as damage. Different methods of damage characterization such as the analysis of light optical micrographs, scanning electron microscopy and transmission electron microscopy are available. Each method has advantages with respect to the preferred scale of observation, resolution and sample preparation. A recent method, ion polishing provides the opportunity to observe voids in the nanometer range. However, the mentioned methods reveal only the defect structure. The link between defect structure and changes in the physical properties requires other methods. A recent concept for the determination of the local degraded Young’s modulus on the basis of resonance measurements is presented. The applicability of the investigated methods is highlighted for bulk-sheet metal forming.