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Dimensionless numbers for dynamic response analysis of clamped square plates subjected to blast loading

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Abstract

A dimensionless governing equation of clamped square plates was obtained by introducing dimensional analysis method to the basic governing equations of plates. The dimensionless governing equation includes three different influence aspects on structural dynamic response: the geometry of the structure, the dynamic resistance ability of material and the ratio of dynamic loads to the resistance ability of material. The dimensionless governing equation was applied to the dynamic response study of plates under blast loading, and a new dimensionless number was suggested for clamped square plates under explosion loads. The suggested dimensionless number has clear physical meaning, and the parameters included in the dimensionless number are easy to get. The dimensionless number suggested in this paper was applied to analysis the experimental data of clamped square plates under blast loading. Meanwhile, comparative analysis was proceeded which indicated the dimensionless number suggested in this paper can be effectively used to predict the dynamic response. The results showed the deflection–thickness ratio is in direct proportion to the dimensionless damage number. An empirical expression was obtained which can be used to the prediction of dynamic response of similar clamped plate under different blast loading condition.

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Abbreviations

\(C_{0}\) :

Sound velocity of environment

Dn :

Johnson damage number

\(D_{\mathrm{ex}}\) :

Dimensionless number suggested in this paper

\(E\) :

Elastic modulus

\(E_{\mathrm{e}}\) :

Explosive energy per unit volume

\(H\) :

Plate thickness

\(I\) :

Impulse

\(k\) :

Constant in Cuer formulation

\(L\) :

Plate length

\(M_{{x}}, M_{{y}}\) :

Bending moment per unit length

\(M_{{xy}}\) :

Torsion moment per unit length

\(m_{{X}}, m_{{Y}}\) :

Dimensionless bending moment

\(m_{{xY}}\) :

Dimensionless torsion moment

\(M_{0}\) :

Fully plastic bending moment per unit length \(M_{0}=\sigma _{0}H^{2 }/ 4\)

\(p\) :

Pressure

\(Q\) :

Total explosive energy

\(Q_{x}, Q_{y}\) :

Transverse shear per unit length

\(R\) :

Explosive distance

\(R_{0}\) :

Charge diameter

Rn :

Zhao’s response number

\(t\) :

Time

\(T\) :

Dimensionless time

\(u\) :

Transverse deflection

\(U\) :

Dimensionless transverse deflection

\(V\) :

Explosive volume

\(V_{0}\) :

Initial velocity

\(W\) :

Explosive mass

\(x\), \(y\) :

Coordinate

\(X\), \(Y\) :

Dimensionless coordinate

\(Z\) :

Scale distance

\(\alpha \) :

Constant in Cuer formulation

\(\nu \) :

Dimensionless number suggested by Li and Jones

\(\mu \) :

Mass per unit area

\(\tau \) :

Duration of the impulse

\(\sigma _{0}\) :

Yield stress

\(\phi _{q}\) :

Dimensionless number suggested by Nurick and Martin

\(\rho _\mathrm{s}\) :

Density of structure

\(\delta \) :

Largest deflection of plate

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Acknowledgments

The research reported herein is supported by the National Natural Science Foundation of China (Project No. 11202236) which is gratefully acknowledged.

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Yao, S., Zhang, D. & Lu, F. Dimensionless numbers for dynamic response analysis of clamped square plates subjected to blast loading. Arch Appl Mech 85, 735–744 (2015). https://doi.org/10.1007/s00419-015-0986-7

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