Buckling state analysis of compressed composite plates with cut-out

Wysmulski, Paweł; Falkowicz, Katarzyna; Filipek, P.

doi:10.1016/j.compstruct.2021.114345

Cited by 25 publications

(19 citation statements)

References 27 publications

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“…Therefore, many scholars often solve relevant problems by numerical methods [37][38][39][40][41][42] . We know that BPR can be treated as a homogeneous structure at the long wavelength limit to obtain the equivalent bulk modulus ( )…”

Section: Static Analysis Of the Buckled Plate Resonatormentioning

confidence: 99%

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Han

Xing

2023

Preprint

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The absorption performance and the sample thickness need to satisfy the causal relation, and the sound absorption bandwidth of a thin layer structure is often very narrow to achieve high sound absorption at low frequency. In this paper, a buckled plate resonator is proposed to achieve the low frequency broadband sound absorption in the deep subwavelength range. The resonator consists of an air-tight back cavity sealed by an elastic circular thin plate. A uniform in-plane compressive force is applied on the thin plate to make the plate buckling produce negative stiffness, and the resonator operates in the pre-buckling state. By adjusting the structural stiffness, the buckled plate resonator achieves the purpose of adjusting Beff and B0, which weakens the causal principle requirement of minimum acoustic structure thickness and realizes broadband low-frequency sound absorption. The final experimental results show that one 3mm(λ/220) back cavity, 0.89 sound absorption is achieved at 515Hz, and the corresponding relative sound absorption bandwidth is 19.4%. From the causal relation, the calculated minimum sample thickness is 6.7mm for the observed absorption spectrum. Compared with traditional plate-type acoustic metamaterials, which achieve low-frequency sound absorption by increasing the mass, the absorption bandwidth is too narrow due to the influence of the quality factor Qm, our work provides a design paradigm for the low frequency broadband acoustic absorbers.

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Section: Static Analysis Of the Buckled Plate Resonatormentioning

confidence: 99%

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Han

Xing

2023

Preprint

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“…Columns were standard thin-walled constructions with perpendicular walls. Every column consisted of three flat plate elements that were joined together [ 56 , 57 , 58 , 59 , 60 , 61 ]. The column material was an eight-layered carbon–epoxy laminate manufactured by autoclave ( Figure 1 ).…”

Section: The Test Objectmentioning

confidence: 99%

Load Eccentricity of Compressed Composite Z-Columns in Non-Linear State

Wysmulski

2022

Materials

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The study investigated short, thin-walled Z-shaped carbon–epoxy laminate columns. Z-columns were compressed while considering the eccentric force realized from the center of gravity of the column section. The study involved performing a nonlinear analysis of the structures with implemented geometric imperfections reflecting the first buckling modes. The nonlinear analysis was performed by using the Tsai–Wu criterion to determine the effort of the composite material. The computations were run until the critical parameter was reached in the Tsai–Wu criterion, allowing for a description of the failure initiation mechanism in the composite material. The first signs of damage to the composite material were determined by using the acoustic emission method. Based on the results, postcritical equilibrium paths of the numerical models were determined. The equilibrium paths were then compared with the experimental characteristics of real structures. The numerical results and experimental findings show a satisfactory agreement. The results confirmed that the numerical models were adequate for estimating the performance of composite structures in the postcritical range, depending on the amplitude of compressive load eccentricity. The research topic undertaken is important because the thin-walled structure design relates to actual loads which, in most cases, differ from the idealized theoretical load conditions.

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“…Nevertheless, composites are vulnerable to unavoidable external load collisions and impacts during service, assembly and maintenance [ 2 , 3 ]. Under external load, the stability of the composite itself changes [ 4 , 5 , 6 ].A low-speed impact similar to a tool drop could cause invisible damage to the interior of the composite, such as matrix cracking, fiber fracture and delamination [ 7 ]. Those invisible damage seriously weaken the mechanical properties of the composites, making it difficult to meet the requirements of aircraft safe operation [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Influence Factors of Damage Interference of Patch-Repaired CFRP Laminates under Double Impacts

Sun

Tie

2023

Polymers

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The impact responses of a patch-repaired carbon-fiber-reinforced polymer (CFRP) specimen under double impacts were compared to study the damage interference mechanism through the combination of experiment and numerical analysis. A three-dimensional finite element model (FEM) with iterative loading based on continuous damage mechanics (CDM) and a cohesive zone model (CZM) was employed to simulate the double-impacts testing with an improved movable fixture at an impact distance of 0 mm–50 mm. The influence of impact distance and impact energy on the damage interference was explored by mechanical curves and delamination damage diagrams of the repaired laminates. When impactors fell within the range of the patch with an impact distance of 0 mm–25 mm at a low level of impact energy, delamination damage of the parent plate caused by the two impacts overlapped, resulting in damage interference. With the continuing increase in impact distance, the damage interference gradually disappeared. When impactors fell on the edge of the patch, the damage area caused by the first impact on the left half of the adhesive film gradually enlarged, and as the impact energy increased from 5 J to 12.5 J, the damage interference caused by the first impact on the second impact was gradually enhanced.

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Buckling state analysis of compressed composite plates with cut-out

Cited by 25 publications

References 27 publications

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Load Eccentricity of Compressed Composite Z-Columns in Non-Linear State

Experimental and Numerical Investigation on the Influence Factors of Damage Interference of Patch-Repaired CFRP Laminates under Double Impacts

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