Abstract
The stresses and deformations in an isotropic laminated plate (steel plate adhered to acrylic plate with different thicknesses) due to impact were analyzed. In-plane stresses were obtained with good accuracy by the plate bending theory. To obtain the out-of-plane stresses, in-plane stresses were substituted into the three-dimensional dynamic theory of elasticity and a numerical integration method was employed. This method is called an approximated three-dimensional theory in this paper. When the plate was impacted on the acrylic side with a long steel bar, an almost circular delamination was created on the interfacial boundary layer of the laminated plate. In the experimental record of the impact force history, a clear signal could be recognized at the creation of the delamination. Employing the data of the experimental impact load history as input for the numerical calculation, out-of-plane stresses on the interfacial layer were obtained. The size of the circular delamination were considered in terms of the resultant shear stress on the boundary layer.
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