Dynamic analysis of a stiffened composite plate under blast load: A new model and experimental validation

Balkan, Demet; Demir, Özgür; Arıkoğlu, Aytaç

doi:10.1016/j.ijimpeng.2020.103591

Cited by 19 publications

(8 citation statements)

References 27 publications

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“…The values of the critical buckling load increased with the increase in the number of layers for both anti-symmetric cross and angle plies. The critical buckling load in both cases settled down at the number of layers (6). The value of the critical buckling load for the anti-symmetric cross ply is higher than the value of the critical buckling load for the anti-symmetric angle ply.…”

Section: Resultsmentioning

confidence: 75%

“…Balkan et al studied the effect of the sandwich stiffener on the nonlinear dynamic behavior of the composite laminated plate under non-uniform blast load. They calculated the displacement, strain and stress in order to investigate the dynamic response of the stiffener after solving the nonlinear coupled equations using the NDSOLVE function of Mathematica Software, [6]. Yousuf reduced the nonlinear linear dynamics behavior of the composite laminated plate using a beam stiffener.…”

Section: Introductionmentioning

confidence: 99%

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Largest Lyapunov Exponent Parameter of Stiffened Carbon Fiber Reinforced Epoxy Composite Laminated Plate Due to Critical Buckling Load Using Average Logarithmic Divergence Approach

Yousuf

2022

Mathematics

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The purpose of this study is to calculate the bending deflection which is used to investigate the largest Lyapunov exponent due to buckling load. The design methodology is to calculate the largest Lyapunov exponent parameter at different thickness ratios and different fiber volume fractions using one and two stiffeners in order to reduce the chaotic phenomenon. The practical implication is to find the bending deflection using a strain gauge through a strain meter, in which this bending deflection is used in the algorithm of average logarithmic divergence to calculate the largest Lyapunov exponent experimentally. The experiment set up is carried out using Southwell plot when the upper head of the servo hydraulic cylinder moves downward. There are no limitations to this research, since it works on all kinds of composite materials, different thickness ratios, and different number of layers, different fiber volume fractions, and different boundary conditions. The findings of this work will allow us to detect the chaotic phenomenon in a stiffened carbon fiber reinforced epoxy composite laminated plate using the conception of the largest Lyapunov exponent parameter. The higher order shear deformation theory (HOSDT) of plates is used to analytically calculate the set of data of the bending deflection against time. All the systems used in this paper have non-periodic motion and chaos because the value of the Lyapunov parameter is above zero. The originality of this paper is the use of the algorithm code of average logarithmic divergence to investigate the value of the largest Lyapunov exponent parameter in the presence of stiffeners based on the bending deflection of a carbon epoxy composite laminated plate.

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Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Largest Lyapunov Exponent Parameter of Stiffened Carbon Fiber Reinforced Epoxy Composite Laminated Plate Due to Critical Buckling Load Using Average Logarithmic Divergence Approach

Yousuf

2022

Mathematics

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“…where q is the explosive heat, r is the radius of the spherical charge, ρ is the explosive density, R is the energy field radius of the spherical charge, and k is the correlation coefficient of energy attenuation. e local field characteristic theorem of waves points out that the reflection or transmission of the incident wavefront with arbitrary shapes at any point on the curved interface is the same as that of plane waves [32,33]. erefore, the transmission and reflection problems of arbitrary incident wavefront on the curved interface can be simplified as plane wave problems.…”

Section: Dynamic Response and Failure Criterion Of Rock In Column Expmentioning

confidence: 99%

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Zhang

Wang

et al. 2021

Shock and Vibration

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In view of the near slope blasting in Barun open-pit mine, which has merged sublevel mining, the operation safety conditions of middle-sized and large equipment in the second phase expansion are poor and need urgent improvement. To increase the efficiency of expansion and reduce costs, a 24-m-high bench and large spacing parameter for loosening blasting are proposed. The analysis of the physical mechanism of the stress wave attenuation in the rock indicates that the cylindrical charge is equivalent to several spherical charges. Considering the pressure attenuation, reflection, transmission, and superposition of the spherical charge after the equivalence, a double exponential function correction equation of the stress wave attenuation is obtained based on the Mises strength criterion. The stress of any point in the rock medium with various spacing parameter is obtained by calculation. ANSYS/LS-DYNA was used to simulate and study the stress distribution of a 24-m-high bench with various spacing parameter. Meanwhile, the accuracy of the correction equation was verified. The parameters of the high-bench blasting with good effect and low cost were determined to be 15 m × 5.5 m, and field tests were carried out. Results show that the large spacing parameter for 24-m-high bench loosening blasting in Barun open-pit mine is efficient and economical in medium-hard rock blasting. This study provides a reference for the practical exploration of the expansion of high benches in open-pit mines in China. The calculation error of the corrected double exponential function is near the numerical simulation result. It is suitable for all kinds of professional designers.

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“…Geng et al [12] proposed a new numerical scheme to determine the stiffened-plate composite structures' mid-frequency and dynamic response. Balkan et al [13] examined the nonlinear dynamic behavior of a laminated composite stiffened plate subjected to the non-uniform blast and load. In this study, a composite sandwich beam was used as a stiffener.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration Analysis of Composite Plate Stiffened by Lattice Structures

Güler¹

2021

European Journal of Science and Technology

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Free vibration behavior of laminated composite plates stiffened by different lattice structures is considered. To simulate free vibration, finite element models were created with Ansys Parametric Design Language (APDL). In the models, SHELL181 and BEAM181 elements were used to model laminated composite and lattice structures, respectively. The influence of the different stiffeners lattice structures on natural frequencies of the composite plate is examined for the clamped-free-clamped-free boundary condition. The results showed that the frequency parameters of the stiffened composite structures made of the L2-type lattice are higher than those composed of other lattice types. This study provides an exciting opportunity to advance our knowledge of the usage of lattice structures as stiffener structures for composite plates.

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Dynamic analysis of a stiffened composite plate under blast load: A new model and experimental validation

Cited by 19 publications

References 27 publications

Largest Lyapunov Exponent Parameter of Stiffened Carbon Fiber Reinforced Epoxy Composite Laminated Plate Due to Critical Buckling Load Using Average Logarithmic Divergence Approach

Largest Lyapunov Exponent Parameter of Stiffened Carbon Fiber Reinforced Epoxy Composite Laminated Plate Due to Critical Buckling Load Using Average Logarithmic Divergence Approach

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Free Vibration Analysis of Composite Plate Stiffened by Lattice Structures

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