Experimental study on mechanical behavior of double-layer toughened sandwich glass with two-side simple support

To study the mechanical behavior of double-layer toughened sandwich glass with two-side simple support under out-of-plane bending, a total of sixty-four specimens with different test parameters were experimentally investigated in this paper. The main parameters of specimens include thickness of single layer, supporting width, and loading length. It was demonstrated that the specimens failed with all pieces of cracks combined together as an entire unit rather than to separate into a large number of glass fragments. What's more, the cracks appeared only in the lower layer of the toughened sandwich glass, extending in a way similar to the spider web. The ultimate bending strength and bending stiffness of the toughened sandwich glass are enhanced with the increase of the thickness of single layer, the supporting width, and the loading length. Among the above parameters, the thickness of single layer plays a leading role in enhancing the ultimate bending strength and bending stiffness of the toughened sandwich glass. Nevertheless, the supporting width only has a slight effect on improving the ultimate bending strength and bending stiffness. Based on the bending theory of thin plates, the simplified design formulas were presented to evaluate the ultimate bending strength of double-layer toughened sandwich glass with two-side simple support under out-of-plane bending, which was verified to be reasonable and accurate.