Transient underwater shock response of sacrificed coating with continuous density graded foam core

Chen, Y.; Chen, F.; Zhang, W.; Du, Zhipeng; Hu, Hua

doi:10.1016/j.compositesb.2016.05.033

Cited by 13 publications

(5 citation statements)

References 33 publications

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“…These studies include nonlinearly varying continuously graded structures, [49] structures with variable cross sections, [56] and middle-high and middle-low density-graded foams. [51] Chen et al [57,58] studied the dynamic behavior of graded foams using the fluid structure interaction method, wherein the foam samples were subject to underwater blast loading. Hightemperature dynamic response of graded cellular structures was investigated by Liu et al, [59] analyzing the influence of the thermal environment on the impact energy mitigation response of density-graded foams using finite-element simulations.…”

Section: Characterization Of the Mechanical Response Of Graded Foamsmentioning

confidence: 99%

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

et al. 2021

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Cellular solids have gained extensive popularity in different areas of engineering due to their unique physical and mechanical properties. Recent advancements in manufacturing technologies have led to the development of cellular solids with highly controllable microstructures and properties modulated for multiple functionalities at low structural weights. The concept of density gradation in cellular solids has recently gained attention due to its potentials in opening new doors to the development of lightweight structures that offer optimal physical and mechanical properties without compromising their favorable characteristics. Herein, a comprehensive insight into the fundamental concepts, fabrication, and current and potential applications of density‐graded cellular solids in various areas of science and engineering is provided. Cellular solids are broadly classified into two main categories: foams and lattice structures. An overview of the fundamental concepts in each category is presented, followed by details on the characterization approaches and some of the most novel processing techniques utilized in fabricating the structures. The uses of density‐graded structures in load‐bearing, acoustic, and biomedical applications are highlighted. The state of the art in each category and the current trends in application‐specific optimization of density‐graded structures are discussed. The review concludes with an outlook of the future directions in this exciting field.

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Section: Characterization Of the Mechanical Response Of Graded Foamsmentioning

confidence: 99%

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

et al. 2021

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“…The blast loading can be approximated as a plane pressure wave when the explosion takes place at a certain distance away from the cladding. In general, the blast pressure can be assumed to be an exponential attenuation wave [ 32 , 33 , 35 , 36 ], written as

where t is the time, P 0 is the initial peak of the blast loading and τ is the decay time of the blast loading. The impulse of the blast can be obtained as P 0 τ .…”

Section: Theoretical and Numerical Modelsmentioning

confidence: 99%

“…Several kinds of sacrificial claddings, serving as a protective function from blast or impact loads, were proposed and investigated theoretically, experimentally and numerically in the literature [ 5 , 6 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], such as single, double, triple and graded cellular sacrificial claddings. However, deformation patterns of those sacrificial claddings under impact loading are different and highly dependent on the density distribution of sacrificial cladding.…”

Section: Blast Alleviation Of Graded-uniform Cellular Sacrificial mentioning

confidence: 99%

“…Recently, the dynamic response of continuous graded cellular materials was investigated and the results illustrate that their dynamic energy absorption can be improved [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ], compared to the homogenous rod. The anti-blast behavior of graded cellular sacrificial cladding is studied in the literature [ 30 , 31 , 32 , 33 , 34 ], which brought some beneficial understandings, e.g., the thickness of the graded cladding needing to absorb the blast loading is smaller with a more significant density gradient parameter. However, the supporting stress that the stress at the supporting end of the structure, for graded cellular claddings (including both the positive and negative density distribution cases) under dynamic loading cannot maintain a constant level and is greatly affected by the density arrangement and dynamic loading intensity.…”

Section: Introductionmentioning

confidence: 99%

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Blast Alleviation of Sacrificial Cladding with Graded and Uniform Cellular Materials

Ding

Zheng

et al. 2020

Materials

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Graded cellular material is a superb sandwich candidate for blast alleviation, but it has a disadvantage for the anti-blast design of sacrificial cladding, i.e., the supporting stress for the graded cellular material cannot maintain a constant level. Thus, a density graded-uniform cellular sacrificial cladding was developed, and its anti-blast response was investigated theoretically and numerically. One-dimensional nonlinear plastic shock models were proposed to analyze wave propagation in density graded-uniform cellular claddings under blast loading. There are two shock fronts in a positively graded-uniform cladding; while there are three shock fronts in a negatively graded-uniform cladding. Response features of density graded-uniform claddings were analyzed, and then a comparison with the cladding based on the uniform cellular material was carried out. Results showed that the cladding with uniform cellular materials is a good choice for the optimal mass design, while the density graded-uniform cladding is more advantageous from the perspective of the critical length design indicator. A partition diagram for the optimal length of sacrificial claddings under a defined blast loading was proposed for engineering design. Finally, cell-based finite element models were applied to verify the anti-blast response results of density graded-uniform claddings.

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“…In addition, the dynamic behavior of graded foam subject to underwater blast loading is also evaluated by Chen et al [42,43] by employing the fluid-structure interaction method. However, most above reports on the foam materials are limited to room temperature environment, and the influences of elevated temperature on their dynamic behaviors are often neglected.…”

Section: Introductionmentioning

confidence: 99%