Fatigue Behavior of Composite Sandwich Panels Under Three Point Bending Load

Ma, Mingze; Yao, Wei; Jiang, Wen; Jin, Wei; Chen, Yan; Li, Piao

doi:10.1016/j.polymertesting.2020.106795

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…As seen in the model with an out-of-plane hexagonal honeycomb core, a better stress transfer can be seen in specimens with longer longitudinal sections, providing better energy absorption in the global deflection caused by the bending load. This process can be explained by the presence of a triaxial state of stresses, where the mechanical strength of the structure is given by a response to the tensile loads on the surface opposite the load, based on the flexural stiffness of the homogeneous outer faces and the shear strength of the core [42]. In this model, the cracks appear at a safety factor of 1.1 (principal stress of approximately 47 MPa) and the tensile and compressive stress zones, as well as the crack propagation path, is well defined, clearly showing the areas susceptible to failure.…”

Section: Numerical Analysis Of Three-point Bendingmentioning

confidence: 99%

Numerical analysis of damage mechanisms for 3D-printed sandwich structures using a meshless method

Castro¹,

Magalhães²,

Rubio³

2022

Modelling Simul. Mater. Sci. Eng.

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Finite element analysis is a widely used simulation technique to analyze structural components and the mechanical behavior of materials under different loading conditions. The major steps involved in finite element simulations are the definition of the basic parameters and the discretization in elements of the component, also known as preprocessing, the analysis of the models and the post-processing by the representation and the interpretation of the obtained results. On the particular case of complex geometries obtained by FDM (Fused Deposition Modeling), the most time consuming of these three steps is that of preprocessing, because on traditional finite element technology is require that the real geometry of the CAD model is simplified to be meshed and analyzed. Nowadays, different techniques have been proposed and developed with this objective: reduce costs in terms of time and specialized human resources because the workflow is easier and simpler. One of these methods is known as the meshless method, which do not require connection between nodes and are based on the interaction of the points of the geometry with the neighbors, so the processor analyzes the real CAD geometry and no simplifications are needed. The present work uses the meshless method based on the theory of external approximation as an alternative to the classic finite element method. In numerical simulations, the influence of core shape is evaluated on the failure mode of the 3D-printed lightweight structures. Three cell core patterns were numerically evaluated under tensile and three-point bending tests: out-of-plane hexagonal honeycomb, S-shape corrugated, and in-plane hexagonal honeycomb cores. The nucleation and propagation of cracks had more heterogeneous profiles for in-plane hexagonal honeycomb cores, showing greater unpredictability in the susceptible areas to failure. The numerical analysis with the meshless method showed a potential for a fast prediction and a low computational cost analysis.

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Section: Numerical Analysis Of Three-point Bendingmentioning

confidence: 99%

Numerical analysis of damage mechanisms for 3D-printed sandwich structures using a meshless method

Castro¹,

Magalhães²,

Rubio³

2022

Modelling Simul. Mater. Sci. Eng.

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“…A typical sandwich structure contains two outer panels with thin and high-strength, and a relatively thick, low-density and strength cellular core material compared to the outer panels [1]. Sandwich structures have been generally used in automotive, aerospace, defense, biomedical and marine industries due to their excellent properties such as lightweight, energy absorption capacity, high strength, thermal and sound insulation and high stiffness [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Energy absorption of 2D auxetic structures fabricated by fused deposition modeling

Tunay,

Cetin

2023

J Braz. Soc. Mech. Sci. Eng.

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Auxetic structures exhibiting unusual mechanical properties from conventional materials are used in many industries and applications due to their high strength, energy absorption performance, high deformation resistance, impact resistance and flexibility. In order to further improve their mechanical properties, it is very important to investigate the deformation behavior and energy absorption characteristics of auxetic structures with different design parameters. In this context, the energy absorption performance of re-entrant auxetic structures with different design parameters i.e., strut orientation, strut angle, and strut thickness was investigated under axial loading in this study. The auxetic structures were produced by the fused deposition modeling method and the energy absorption performances of the structures were evaluated using various crashworthiness indicators such as energy absorption (EA), specific energy absorption (SEA), mean crash force (MCF), peak crash force (PCF) and crash force efficiency (CFE). Analysis of variance (ANOVA) was also implemented to determine the influence of design parameters on MCF, SEA and CFE. The results showed that the strut thickness is the highest influencing parameter on the values for all chosen energy absorption criteria. In particular, the contribution ratios of strut thickness, strut angle and strut orientation on the values of SEA are74.99%, 11.45% and 3.25%, respectively. These values are 63.74%, 7.22% and 0.92% for CFE values, respectively.

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“…Florence et al 13 studied the effect of energy-absorbing materials on the mechanical behavior of hybrid fiber-reinforced plastic honeycomb core sandwich composites under the three-point bending, edgewise compression, flatwise compression, and Charpy impact. Ma et al 14 carried out the bending fatigue tests of honeycomb sandwich panels using an improved three-point bending test. A life prediction method was proposed and its effectiveness in predicting the fatigue life of sandwich panels has been verified.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the flexural and compressive properties of carbon fiber reinforced sandwich panels with M-shaped core

Azadi

2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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The present paper addresses the flexural and compressive properties of carbon fiber reinforced sandwich panels with an M-shaped core reinforced with nan-silica particles. Experimental compression and three-point bending tests are conducted to determine the flexural and compressive stiffness and the load-carrying capacity of these advanced composites. In addition, polyurethane foam has been injected into the core of the sandwich panel. The results of these analyses are compared for the sandwich panels containing the various number of carbon layers, 8-layered carbon fiber and 14-layered carbon fiber. From the experimental results of the study, it was figured out that: (a) The experimental results show that the specific flexural strength of the sandwich panels with 14-layered carbon fiber has a higher strength than that of the sandwich panels with 8-layered carbon fiber. (b) Adding 1–3 weight percentage of nano-silica into the carbon fiber had the most desirable effects on enhancing flexural and compressive strength of the sandwich panels. (c) It was found that polyurethane foam enhanced sandwich panels’ ultimate compressive and bending loads and absorber features.

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Fatigue Behavior of Composite Sandwich Panels Under Three Point Bending Load

Cited by 24 publications

References 16 publications

Numerical analysis of damage mechanisms for 3D-printed sandwich structures using a meshless method

Numerical analysis of damage mechanisms for 3D-printed sandwich structures using a meshless method

Energy absorption of 2D auxetic structures fabricated by fused deposition modeling

Experimental analysis of the flexural and compressive properties of carbon fiber reinforced sandwich panels with M-shaped core

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