shown Figs. 22.5, 22.6 and 22.7. In strain maps, the behavior that the strain concentration region moves to the right direction is also observed. The strain concentration of the polyurethane resin having the low rigidity is higher than that of acrylic resin. In the bi-material as shown Fig. 22.10, the highest strain concentration occurs in the polyurethane resin at the far region from the interface. The reason is that the deformation near the interface of the polyurethane in the bi-material is constrained by acrylic resin because of the low rigidity of the polyurethane resin. Strain distributions of each strain maps are slightly Fig. 22.6 Displacement distributions along axial direction in polyurethane resin. (a) 15–32 frame, (b) 15–35 frame, (c) 15–38 frame Fig. 22.7 Displacement distributions along of axial direction in bi-material. (a) 15–32 frame, (b) 15–35 frame, (c) 15–38 frame 22 Observation of Dynamic Deformation Behavior Around Interface of Bi-material Using DIC 145
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