scholarly journals Equivalent SDOF Load Transformation Factors for One-Way Members Subjected to Air Blast Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-26
Author(s):  
Yaobei He ◽  
Shaobo Geng ◽  
Yaxin Wei ◽  
Gan Luo ◽  
Xin Gong ◽  
...  
Keyword(s):  
Structural Design ◽  
Near Field ◽  
Blast Loading ◽  
Far Field ◽  
Air Blast ◽  
Simply Supported ◽  
Transformation Factor ◽  
Fixed End ◽  
Air Blast Loading ◽  
Selection Of

The equivalent single-degree-of-freedom (SDOF) load transformation factor expressions of the simply supported, fixed end and simply-fixed one-way members subjected to air blast loading are derived by finite series-expansion method or finite point-fitting method. Moreover, figures are used to show the relative relationship between the load transformation factors KL and the ratio of stand-off distance to structural span (γ). The typical calculation conditions show that the load transformation factors are sensitive to the piecewise function of peak overpressure when γ is less than 0.5. The load transformation factor will be a smooth curve for peak overpressure adopting a single smooth continuous function. For the blast-resistant structural design, if the error of 3% in the elastic stage and 5% in the plastic stage can be allowed, γ = 1.0 is the demarcation point between near field blast and far field blast. In addition, if the error of 0.5% can be allowed, γ ≥ 2.0 can be treated as the far field blast. The calculation results of far field blast show that the values of KL of simply supported, simply-fixed, and fixed-end members are 0.64, 0.58, and 0.54, respectively, which means that the load transformation factor is insensitive to the selection of shape function in vibration mode function or static deflection curve function. The calculation accuracy of KL expression for simply supported beam structure in this paper has been verified through near field blast experiments. This paper provides a clear numerical definition for the distinction between near field and far field explosions. It provides qualification criteria for analyzing explosion categories in blast-resistant structural design and a reference for the selection of theoretical calculation formulas.

scholarly journals Numerical Analysis of Dynamic Response of Corrugated Core Sandwich Panels Subjected to Near-Field Air Blast Loading

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Pan Zhang ◽  
Yuansheng Cheng ◽  
Jun Liu
Keyword(s):  
Dynamic Response ◽  
Failure Modes ◽  
Near Field ◽  
Three Dimensional ◽  
Sandwich Panels ◽  
Blast Loading ◽  
Front Face ◽  
Air Blast ◽  
Solid Plate ◽  
Air Blast Loading

Three-dimensional fully coupled simulation is conducted to analyze the dynamic response of sandwich panels comprising equal thicknesses face sheets sandwiching a corrugated core when subjected to localized impulse created by the detonation of cylindrical explosive. A large number of computational cases have been calculated to comprehensively investigate the performance of sandwich panels under near-field air blast loading. Results show that the deformation/failure modes of panels depend strongly on stand-off distance. The beneficial FSI effect can be enhanced by decreasing the thickness of front face sheet. The core configuration has a negligible influence on the peak reflected pressure, but it has an effect on the deflection of a panel. It is found that the benefits of a sandwich panel over an equivalent weight solid plate to withstand near-field air blast loading are more evident at lower stand-off distance.

scholarly journals The Nonlinear Dynamic Behaviour of Tapered Laminated Plates Subjected to Blast Loading

2012 ◽  
Vol 19 (6) ◽  
pp. 1235-1255 ◽  
Author(s):  
Sedat Susler ◽  
Halit S. Turkmen ◽  
Zafer Kazancı
Keyword(s):  
Dynamic Response ◽  
Nonlinear Dynamic ◽  
Dynamic Behaviour ◽  
Equations Of Motion ◽  
Blast Loading ◽  
Laminated Plates ◽  
Finite Difference Approximation ◽  
Air Blast ◽  
Simply Supported ◽  
Air Blast Loading

In this study, the geometrically nonlinear dynamic behaviour of simply supported tapered laminated composite plates subjected to the air blast loading is investigated numerically. In-plane stiffness, inertia and the geometric nonlinearity effects are considered in the formulation of the problem. The equations of motion for the tapered laminated plate are derived by the use of the virtual work principle. Approximate solution functions are assumed for the space domain and substituted into the equations of motion. Then, the Galerkin method is used to obtain the nonlinear algebraic differential equations in the time domain. The resulting equations are solved by using the finite difference approximation over the time. The effects of the taper ratio, the stacking sequence and the fiber orientation angle on the dynamic response are investigated. The displacement-time and strain-time histories are obtained on certain points in the tapered direction. The results obtained by using the present method are compared with the ones obtained by using a commercial finite element software ANSYS. The results are found to be in an agreement. The method presented here is able to determine the nonlinear dynamic response of simply supported tapered laminated plates to the air blast loading accurately.

Attempts to improve on the V‐hull structural design for air‐blast loading applications

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1499-1506
Author(s):  
Genevieve Langdon ◽  
Andrew Curry ◽  
Vinay Shekhar ◽  
Aashir Siddiqui ◽  
Christopher Murray ◽  
...  
Keyword(s):  
Structural Design ◽  
Blast Loading ◽  
Air Blast ◽  
Air Blast Loading

The influence of different pre-formed holes on the dynamic response of square plates under air-blast loading

2017 ◽  
Vol 78 ◽  
pp. 122-133 ◽  
Author(s):  
Ying Li ◽  
Weiguo Wu ◽  
Haiqing Zhu ◽  
Zhen Wu ◽  
Zhipeng Du
Keyword(s):  
Dynamic Response ◽  
Blast Loading ◽  
Air Blast ◽  
Air Blast Loading

Numerical investigation on the dynamic response of foam-filled corrugated core sandwich panels subjected to air blast loading

2017 ◽  
Vol 21 (3) ◽  
pp. 838-864 ◽  
Author(s):  
Yuansheng Cheng ◽  
Tianyu Zhou ◽  
Hao Wang ◽  
Yong Li ◽  
Jun Liu ◽  
...  
Keyword(s):  
Total Energy ◽  
Energy Absorption ◽  
Sandwich Panels ◽  
Blast Loading ◽  
Front Face ◽  
Back Side ◽  
Air Blast ◽  
Foam Filled ◽  
Blast Performance ◽  
Air Blast Loading

The ANSYS/Autodyn software was employed to investigate the dynamic responses of foam-filled corrugated core sandwich panels under air blast loading. The panels were assembled from metallic face sheets and corrugated webs, and PVC foam inserts with different filling strategies. To calibrate the proposed numerical model, the simulation results were compared with experimental data reported previously. The response of the panels was also compared with that of the empty (unfilled) sandwich panels. Numerical results show that the fluid–structure interaction effect was dominated by front face regardless of the foam fillers. Foam filling would reduce the level of deformation/failure of front face, but did not always decrease the one of back face. It is found that the blast performance in terms of the plastic deflections of the face sheets can be sorted as the following sequence: fully filled hybrid panel, front side filled hybrid panel, back side filled hybrid panel, and the empty sandwich panel. Investigation into energy absorption characteristic revealed that the front face and core web provided the most contribution on total energy absorption. A reverse order of panels was obtained when the maximization of total energy dissipation was used as the criteria of blast performance.

scholarly journals Optimal design of a novel cylindrical sandwich panel with double arrow auxetic core under air blast loading

2020 ◽  
Vol 16 (3) ◽  
pp. 617-626 ◽  
Author(s):  
Xu-ke Lan ◽  
Qi Huang ◽  
Tong Zhou ◽  
Shun-shan Feng
Keyword(s):  
Optimal Design ◽  
Sandwich Panel ◽  
Blast Loading ◽  
Air Blast ◽  
Air Blast Loading ◽  
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