4 March 2015 Experimental investigation on fracture of layered plates
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Proceedings Volume 9302, International Conference on Experimental Mechanics 2014; 930215 (2015) https://doi.org/10.1117/12.2080972
Event: International Conference on Experimental Mechanics 2014, 2014, Singapore, Singapore
Layered structures, used in many applications such as windshields, thermal protection systems, heavy armor etc., are comprised of layers having different elastic and fracture properties. Present study focuses on understanding the behavior of cracks in a layered plate oriented in such a way that there are property jumps across the crack front. Two layer plates were fabricated by joining Polymethylmethacrylate (PMMA) and epoxy sheets using an epoxy based adhesive (Araldite). Single edge notched specimens were subjected to mixed mode loading using the asymmetric four point bending configuration. The results of the study indicated that the failure in two layer plates is progressive in nature. Crack extension starts in the most vulnerable layer (epoxy) first and the crack grows in a sequence of jumps and arrests in this layer. Once this crack reaches a particular length the crack in the second layer starts extending resulting in final failure of the plate. Similar sequence of events was observed in the case of dynamically loaded samples. The predictions of the load at which epoxy crack starts growing and the angle at which the crack grows using the maximum tensile stress criteria were in reasonable agreement with the experimentally observed values.
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Servesh Agnihotri, Servesh Agnihotri, Venkitanarayanan Parameswaran, Venkitanarayanan Parameswaran, "Experimental investigation on fracture of layered plates", Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 930215 (4 March 2015); doi: 10.1117/12.2080972; https://doi.org/10.1117/12.2080972

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