Abstract
Laser speckle interferometry method can measure strain and displacement of material without contact. But, this method has a week point about the accuracy when applied to the rough surfaced object. Then, in this paper, laser speckle interferometry method was applied to measure the elastic properties of Hot-Dip Zn coated steel that has rough surface. The results are as follows.
1) Apparent Young's modulus of Hot-Dip Zn coated steel decreases with the increase of galvanized layer.
2) The Young's modulus of the (δ1+η) mixture layer and columnar layer, estimated by the compound rule and the multiple regression analysis, became 45.0GPa and 62.3GPa, respectively.
3) According to the above conclusions, the laser speckle interferometry method can be applied to measure the elastic properties of rough surfaced composite specimens.
