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Keywords: viscoelastic stiffeners, composite plate, blast load, dynamic response, stiffened plate.

Summary

In this study, the dynamic response of unstiffened and stiffened laminated plates subjected to blast loading is investigated both experimentally and numerically. The dynamic response of the plate for different stiffener configuration is analysed. Within the context of the experiment, an unstiffened plate is manufactured and tested. In modal tests, with the help of a hammer set and accelerometer, the first natural frequency of the plate is obtained. The unstiffened composite plate is also modelled using ANSYS to help the comparison of results obtained from experimental results. In modal tests, experimental results are considerably close to the results obtained from the free vibration analysis performed using ANSYS. Blast load experiments are also conducted with unstiffened plates used in modal tests. In the experiments, blast loads are obtained using a cylindirical shock tube. A composite plate is placed in front of the shock tube with clamped edges. The increase in air pressure in the shock tube results in a tearing of the membrane at the end of shock tube, and pressurized air is impinged on the laminated composite plate. The strain on the plate is obtained from the strain gauges placed on the back side of the plate and the pressure distribution is obtained from the pressure sensors placed on the front side of the plate with respect to time. A pressure function on the plate is formed to simulate the blast load experiments numerically using the the experimental pressure distribution. This pressure function is used for the transient analysis of all plates in this study. First of all, transient analysis for the unstiffened plate is performed and the strain time histories are compared with the experimental results. Then, composite plates with different configurations of stiffeners are modelled and analysed under the blast load. As a core, 10 mm thick polypropylene honeycomb core with a high damping ratio is used to model the stiffeners. Strain- time and displacement-time histories are obtained from the finite element analysis.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 93 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: Paper 277 Dynamic Response of a Laminated Composite Plate with Viscoelastic Stiffeners subject to Blast Load O. Acar Ezer, D. Kececi Balkan, H.S. Türkmen and Z. Mecitoglu Faculty of Aeronautics and Astronautics, Istanbul Technical University, Maslak, Turkey doi:10.4203/ccp.93.277 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Dynamic Response of a Laminated Composite Plate with Viscoelastic Stiffeners subject to Blast Load", in , (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 277, 2010. doi:10.4203/ccp.93.277 Keywords: viscoelastic stiffeners, composite plate, blast load, dynamic response, stiffened plate. Summary In this study, the dynamic response of unstiffened and stiffened laminated plates subjected to blast loading is investigated both experimentally and numerically. The dynamic response of the plate for different stiffener configuration is analysed. Within the context of the experiment, an unstiffened plate is manufactured and tested. In modal tests, with the help of a hammer set and accelerometer, the first natural frequency of the plate is obtained. The unstiffened composite plate is also modelled using ANSYS to help the comparison of results obtained from experimental results. In modal tests, experimental results are considerably close to the results obtained from the free vibration analysis performed using ANSYS. Blast load experiments are also conducted with unstiffened plates used in modal tests. In the experiments, blast loads are obtained using a cylindirical shock tube. A composite plate is placed in front of the shock tube with clamped edges. The increase in air pressure in the shock tube results in a tearing of the membrane at the end of shock tube, and pressurized air is impinged on the laminated composite plate. The strain on the plate is obtained from the strain gauges placed on the back side of the plate and the pressure distribution is obtained from the pressure sensors placed on the front side of the plate with respect to time. A pressure function on the plate is formed to simulate the blast load experiments numerically using the the experimental pressure distribution. This pressure function is used for the transient analysis of all plates in this study. First of all, transient analysis for the unstiffened plate is performed and the strain time histories are compared with the experimental results. Then, composite plates with different configurations of stiffeners are modelled and analysed under the blast load. As a core, 10 mm thick polypropylene honeycomb core with a high damping ratio is used to model the stiffeners. Strain- time and displacement-time histories are obtained from the finite element analysis. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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