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Evaluation of dynamic SIF during crack propagation in layered plates having property variation along the crack front

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Abstract

The present study emphasizes understanding the crack propagation in layered structures under dynamic loading conditions when the property jumps occur across the crack front. Layered plates were made by joining polymethylmethacrylate (PMMA) and epoxy sheets using an epoxy-based adhesive (Araldite). Single edge notched (SEN) specimens were subjected to dynamic loading using a modified Hopkinson bar setup. An array of strain gauges installed on surfaces of specimen was used to record the strain history in the layers during crack propagation from which the dynamic stress intensity factor (SIF) during crack propagation was evaluated. Photographs of the propagating crack front were also simultaneously captured using a high-speed imaging camera to obtain the crack tip location history in each layer.

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Acknowledgements

The author acknowledges the High-Speed Experimental Mechanics Laboratory (HSEML) at IIT Kanpur for performing the experiments. The author is also thankful to Prof. P. Venkitanarayanan for providing the valuable guidance during the experiments. The author acknowledges the financial support of Aeronautical Research and Development Board, India through grant number DARO/08/1051679/M/I. The author also acknowledges the financial support through grant number SR/FST/ERII-003/2006 under the FIST program by Department of Science and Technology, Government of India for the ultra-high-speed camera. The author also thanks Anjani Kumar Varshney for providing MATLAB code for dispersion correction in polymeric bars.

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  1. Department of Mechanical–Mechatronics Engineering, The LNM Institute of Information Technology (LNMIIT), Jaipur, Rajasthan, India

    Servesh Kumar Agnihotri

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Correspondence to Servesh Kumar Agnihotri.

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Agnihotri, S.K. Evaluation of dynamic SIF during crack propagation in layered plates having property variation along the crack front. Sādhanā 45, 136 (2020). https://doi.org/10.1007/s12046-020-01345-x

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