Mechanical behaviors and fracture mechanisms of CFRP sandwich composite structures with bio-inspired thin-walled corrugated cores

Le, Vinh Tung; Jin, Tailie; Goo, Nam Seo

doi:10.1016/j.ast.2022.107599

Cited by 18 publications

(4 citation statements)

References 58 publications

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“…Therefore, to achieve multi-objective robust optimization of F-DHC, the two conflicting responses (SEA u and IPCF 0 ) are converted into a single response, that is, gray relational grade (GRG) that to be maximized (LTB), through gray relational analysis (GRA). For this purpose, the gray relational generation based on equation (15) for SEA u and equation ( 16) for IPCF 0 , the gray relational coefficient based on equation (18) and the gray relational grade (GRG) based on equation (19) or equation ( 20) are obtained and demonstrated in Table 9. Note that herein to explore the effect of different weights on the optimization results, SNR1 is given three different weights (v 1 = 0.4,0.5,0.6) and the weights of SNR2 (v 2 = 0.6,0.5,0.4) are changed accordingly, resulting in three different groups of GRG as shown in Table 9.…”

Section: Resultsmentioning

confidence: 99%

“…To improve crashworthiness of TWSs without adding too much weight, scholars worldwide have proposed many effective methods during past decades, such as multi-cell design, 6,7 functionally-graded design, [8][9][10] filling structures (or materials), [11][12][13] employment of lightweight yet high strength composite materials, [14][15][16] hybrid materials, and structures, 17 and application of advanced manufacturing processes, 18,19 etc. Considering existing car bodies are generally composed of a large number of hollow TWSs possessing specific demands or constraints on strength, lightweight, spatial layout, or cost, aluminum foam-filling is considered a relatively more efficient and practical approach to improve the crashworthiness of TWSs of a car body due to its excellent compressive energyabsorption characteristics and light weight.…”

Section: Introductionmentioning

confidence: 99%

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Multi-objective robust optimization of foam-filled double-hexagonal crash box using Taguchi-grey relational analysis

Xiong,

Wang,

Wang

et al. 2023

Advances in Mechanical Engineering

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In this paper, a novel thin-walled double-hexagonal crash box is first proposed and then multi-objective robust optimized for better overall crashworthiness under multi-angle impact loading, using a proposed hybrid method combining aluminum foam-filling and Taguchi-grey relational analysis (GRA). Specifically, the finite element (FE) models of the regularly-shaped double-hexagonal column (DHC) extracted from original irregularly-shaped crash box under multi-angle impact loading, including hollow (H-DHC) and foam-filled (F-DHC), are first built and validated by experiments. On this basis, a comprehensive crashworthiness comparison is conducted to explore relative merits of F-DHC over original H-DHC under multi-angle impact loading. After that, the F-DHC is multi-objective robust optimized for maximizing overall specific energy absorption (SEAθ) and minimizing overall initial peak crushing force (IPCF0) simultaneously under multi-angle impact loading, using a hybrid method of Taguchi-GRA. At last, a bumper-crash box integrated crashworthiness analysis under multi-angle impact loading is executed to further verify the optimization. The optimal F-DHC and the optimized crash box within the optimal F-DHC demonstrate evident improvement of crashworthiness compared to their respective initial designs, indicating aluminum foam-filling combined with Taguchi-GRA could be an effective approach for multi-objective robust optimization of the novel crash box and other similar vehicle structures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-objective robust optimization of foam-filled double-hexagonal crash box using Taguchi-grey relational analysis

Xiong,

Wang,

Wang

et al. 2023

Advances in Mechanical Engineering

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show abstract

“…Furthermore, as the broken fiber is dragged out of the matrix, the interface debonding absorbs a huge amount of energy, and this pullout effort contributes significantly to toughness. 7 In reality, CFRP fracture is a process in which a significant number of fibers is broken and subsequently dragged out, revealing some of its toughness. 8 It differs from ordinary brittle material fracture.…”

Section: Introductionmentioning

confidence: 99%

“…When some strands break, the matrix transfers the stress to neighboring fibers, lowering the likelihood of stress concentration and absorbing a huge quantity of energy. Furthermore, as the broken fiber is dragged out of the matrix, the interface debonding absorbs a huge amount of energy, and this pullout effort contributes significantly to toughness 7 . In reality, CFRP fracture is a process in which a significant number of fibers is broken and subsequently dragged out, revealing some of its toughness 8 .…”

Section: Introductionmentioning

confidence: 99%

Prediction of pseudo‐ductility and structural optimization of nacre‐inspired carbon fiber‐reinforced polymer laminate

Xiao,

Li,

Han

et al. 2023

Polymer Composites

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To enhance the ductility of carbon fiber‐reinforced polymer (CFRP) composites, a variety of nacre‐inspired structures with discontinuities were constructed based on the ratio of overlapping length to CFRP laminate thickness. The damage mechanisms and tensile characteristics of discontinuous laminates were elucidated using finite element analysis and experimental investigation. To anticipate the mechanical behavior of the CFRP laminate, an improved Chang‐Chang failure criteria was devised. Moreover, a model adopts the Benzeggagh‐Kenane criterion on cohesive surfaces for delamination initiation and propagation. The predicted stress–strain values are validated using experimental data under tensile stress. Furthermore, a mathematical model accurately predicted the relationship between the tensile performance of nacre‐inspired laminate and overlapping length. According to the findings, the longer the overlapping length (more than 19.5 mm) is, the lower the pseudo‐ductility. Meanwhile, the shorter the overlapping length (less than 17.5 mm) is, the lower the tensile strength. Furthermore, the laminate exhibits some pseudo‐ductility as well as little decrease in tensile strength when the overlapping length is approximately 18.5 mm.Highlights A mathematical model for predicting the tensile properties of various nacre‐inspired laminates was established. The relationship between the discontinuous structure and the pseudo‐ductility of the nacre‐inspired laminate was revealed. Compared with other similar structural laminates, the laminate with an overlapping length of 17.5 mm has better overall performance. Proposed an improved Chang‐Chang progressive failure criterion that was utilized to simulate and analyze the mechanical response and damage of the nacre‐inspired laminates under tension.

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Enhanced Flexural Performance of Diamond Latticed Triply Periodic Minimal Surface Sandwich Panels

Mahapatra,

Velmurugan,

Jayaganthan

2023

Adv Eng Mater

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The additively manufactured bio‐inspired lattice structures have various superior properties in comparison to their solid counterparts as they are lightweight and suitable for fabricating various parts in aerospace sectors. This study limits the investigation of triply periodic minimal surface (TPMS)‐based diamond sheet and solid cellular structures with varying densities (25%, 35%, 45%, and graded) under flexural loading conditions. The sandwich panel structures are made using acrylonitrile butadiene styrene material utilizing the fused filament fabrication (FFF) process. In‐plane flexural performances of the FFF fabricated bio‐inspired TPMS diamond sandwich panels are investigated for the first time. The panels are created to investigate how density and unit cell geometry affect stiffness, strength, and energy absorption. The digital image correlation approach is used to visualize the deflection of the panels subjected to three‐point bending. Also, a theoretical analysis is done to find out the deflection of the sandwich panel structures. An Ashby chart shows the comparison of the specific energy absorption of the TPMS diamond sandwich panels used in this study with several other cellular core sandwich panels available in the literature. This study provides a valuable contribution to the improved energy absorption performance of additively manufactured cellular materials.

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Mechanical behaviors and fracture mechanisms of CFRP sandwich composite structures with bio-inspired thin-walled corrugated cores

Cited by 18 publications

References 58 publications

Multi-objective robust optimization of foam-filled double-hexagonal crash box using Taguchi-grey relational analysis

Multi-objective robust optimization of foam-filled double-hexagonal crash box using Taguchi-grey relational analysis

Prediction of pseudo‐ductility and structural optimization of nacre‐inspired carbon fiber‐reinforced polymer laminate

Enhanced Flexural Performance of Diamond Latticed Triply Periodic Minimal Surface Sandwich Panels

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