Nonlinear Structural Response of Laminated Composite Panels Subjected to Blast Loadings

Halit Türkmen,Oğuz Borat,Zahit Mecitoğlu

doi:10.3390/mca1010126

Halit Türkmen, Oğuz Borat + Show 1 more

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https://doi.org/10.3390/mca1010126

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Abstract

'This paper presents a theoretical analysis and correlation with numerical results of the displacement time histories of laminated composite panels exposed to normal blast shock waves. Nonlinear dynamic equations of the cylindrically curved laminated panels are derived by the use of the Lagrange equations in the frame of Love's theory of thin shells. The governing equations of the laminated curved panel are solved by Runge-Kutta method. In addition, ANSYS finite element software is used to obtain displacement time history numerically. The effect ofloading conditions and geometrical properties is examined on the dynamic behavior.

Highlights

Advanced composites are being used in many applications ranging from aircraft and submarines to pressure vessels and automotive parts
The early published work was that of Hopkinson [I] in which he outlined his theory for using scale models with the statement: "If two structural systems, identically similar except in size, be subjected to blast loading from two explosive charges whose weights are in proportion to the cube of the ratio of the linear dimensions of the two structures, the behavior of the two structural systems will be identically similar with the distorsions scaling as the ratio of the linear dimensions."
Theoretical and numerical results are obtained for different radii of curvature of the three layered circular cylindrical shell, such as 25cm, 50cm and lOOOOcm(for flat panels)

Summary

Introduction

Advanced composites are being used in many applications ranging from aircraft and submarines to pressure vessels and automotive parts. The air blast load which is produced after detonation within a tube consists of several pulses of very complex waveform. The waveform is complex because of the complication of the shock waves. The assesment of the effects of the explosives on structural systems was apparently not studied systematically until World War I. The early published work was that of Hopkinson [I] in which he outlined his theory for using scale models with the statement: "If two structural systems, identically similar except in size, be subjected to blast loading from two explosive charges whose weights are in proportion to the cube of the ratio of the linear dimensions of the two structures, the behavior of the two structural systems will be identically similar with the distorsions scaling as the ratio of the linear dimensions."

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