Dynamic behavior of stiffened plates under underwater shock loading

Mahmoud M. K. Helal; Fathallah Elsayed

doi:10.3139/120.110744

Article

Dynamic behavior of stiffened plates under underwater shock loading

Mahmoud M. K. Helal and Fathallah Elsayed

Published/Copyright: May 15, 2015

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From the journal Materials Testing Volume 57 Issue 6

Abstract

A numerical investigation has been carried out to examine the behavior of stiffened steel plates subjected to different shock loads resulting from an underwater explosion (UNDEX). The aim of this work is to enhance the dynamic response to resist UNDEX and obtain the optimal configuration for stiffened plates to resist underwater shock loading. A non-linear dynamic numerical analysis of the underwater explosion phenomena associated with different geometrical stiffened steel plates is performed using the ABAQUS/Explicit finite element code. Special emphasis is focused on the evolution of mid-point displacements and velocity. Further investigations have been performed to study the effects of including material damping and the rate-dependent material properties at different shock loads. The results indicate that stiffeners configurations and shock loads affect greatly the overall performance of steel plates and are sensitive to the materials data. Also, the numerical results can be used to obtain design guidelines of floating structures to enhance resistance of underwater shock damage, since explosive tests are costly and dangerous.

Kurzfassung

Für den vorliegenden Beitrag wurde eine numerische Untersuchung durchgeführt, um das Verhalten von versteiften Stahlblechen zu untersuchen, die verschiedenen Schockbeanspruchungen als Ergebnis einer Unterwasserexplosion (Underwater Explosion (UNDEX) ausgesetzt wurden. Das Ziel dieser Forschungsarbeiten bestand darin, die dynamische Antwort solcher Komponenten als Widerstand gegen UNDEX zu verbessern und die optimale Konfiguration für versteifte Platten gegen Unterwasserschockbeanspruchung zu erzielen. Es wurde eine nichtlineare dynamische numerische Analyse der Unterwasserexplosionsphenomäne mit verschieden geometrisch versteiften Stahlblechen durchgeführt, wobei der ABAQUS/Explicit Finite Elemente Code verwendet wurde. Es wurde besonderer Wert auf die Entwicklung der Mittelpunktsverschiebungen und deren Geschwindigkeit gelegt. Weitere Untersuchungen wurden durchgeführt, um die Auswirkungen bei Einbeziehung von Materialdämpfung und verhältnisabhängiger Materialeigenschaften bei verschiedenen Schockbeanspruchungen zu untersuchen. Die Ergebnisse deuten darauf hin, dass die Versteifungskonfigurationen und Schockbeanspruchungen erheblich die Gesamtperformanz der Stahlbleche beeinflussen und eine Sensitivität gegenüber den Materialdaten besteht. Weiterhin können die numerischen Ergebnisse verwendet werden, um Designrichtlinien für Schwimmkörper zu erhalten, die den Widerstand gegen Unterwasserschockbeanspruchung verbessern, zumal Explosionsversuche kostenintensiv und gefährlich sind.

§Correspondence Address, Assistant Professor Mahmoud Helal, Production and Mechanical Design Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt, E-mail: eng_mah_helal@yahoo.com

Assistant Professor Mahmoud M. K. Helal, born in 1978, received his Bachelor and Master degrees in Mechanical Engineering Design in Production Engineering and Mechanical Design Department from Mansoura University, Egypt in 2000 and 2005, respectively. He received his PhD degree in Mechatronics from State Key Laboratory of Robotics and System, Harbin Institute of Technology, China in 2011. Since 2012, he has been with the Robotics Institute at Harbin Institute of Technology, and is now Assistant Professor. He works as an assistant lecture in the Production Engineering and Mechanical Design Department at Mansoura University. His research interests lie in MEMS design assembly, micromanipulation robot and solid mechanics.

Assistant Professor Elsayed Fathallah, born in 1976, received his Bachelor and Master degrees in Civil Engineering from the Civil Engineering Department of the Military Technical College, Cairo, Egypt in 1999 and 2007, respectively. He received his PhD degree from Harbin Engineering University, College of Aerospace and Civil Engineering, China in 2015. He works as an assistant professor in the Civil Engineering Department of the Military Technical College. His research interest lies mainly in the strength of materials and damage as well as the elastic wave theory and its application.

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Published Online: 2015-05-15

Published in Print: 2015-06-01

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https://doi.org/10.3139/120.110744