Influences of dispersion types and area densities of chopped fiber‐based interfacial reinforcements on mechanical properties of sandwich structures

Zhi, Wang; Chen, Qihui; Du, Ruxu; Linghu, Ting; Ying-ju, Gao; Zhao, Guizhe

doi:10.1002/pc.24746

Cited by 7 publications

(3 citation statements)

References 31 publications

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“…Figure 3C is the image when the fiber content is 20 g/m 2 . Many SCF has overlapped a lot to cover the whole interlayer area, which may form defects in the interlayer area after curing and cause stress concentration and thus degradation of performance 34 …”

Section: Resultsmentioning

confidence: 99%

Interlaminar fracture toughness of carbon/epoxy composites laminates toughened by short carbon fiber

et al. 2023

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In this paper, short carbon fiber (SCF) interlaminar toughened carbon fiber reinforced epoxy resin (CF/EP) composite laminates were prepared. The effect of SCF content on the mode II interlaminar fracture toughness (GIIC) and flexural properties of CF/EP composites was investigated. It was shown that the addition of SCF between the plies had an effect on the GIIC of the composites. When the SCF content was 10 g/m2, the GIIC increased from 1506.62 J/m2 to 1995.6 J/m2, which improved by about 32.46%. When the content of SCF was 5 g/m2, the flexural strength and flexural modulus increased by 36.92% and 98.48%, respectively, showing the best performance. The toughening mechanism of SCF was observed by SEM images as SCF debonding and pulling out from the resin and SCF fracture. The present study was also compared with our previous study on short aramid fiber interlaminar toughened CF/EP composites, and the test data and SEM images of the two experiments were compared to analyze the effect of different short fibers on the interlaminar toughening effect, which provides some reference for the selection of interlaminar toughening materials.

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Section: Resultsmentioning

confidence: 99%

Interlaminar fracture toughness of carbon/epoxy composites laminates toughened by short carbon fiber

et al. 2023

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“…Materials with reduced density are usually strengthened by suitable reinforcement elements, so they achieve a higher load‐carrying capacity through the direction of thickness while maintaining the lightweight. [ 21 ] These reinforcing elements are classified into three categories. The first group is based on the matrix constituent.…”

Section: Introductionmentioning

confidence: 99%

Energy absorption and collapse behavior of PP‐based pin‐reinforced composite sandwich panels under quasi‐static flatwise compression loading

et al. 2023

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This article investigates the energy absorption and failure behavior of thermoplastic composite sandwich panels made entirely of polypropylene (PP) and pin‐reinforced core under quasi‐static compressive loading. The pins are manufactured by thermoforming and assembled with face sheets. The specimens were subjected to flatwise compressive loading to examine energy absorption capabilities. Moreover, the finite element method (FEM) is used to analyze core sandwich panels reinforced with cubic, cylindrical, beam, and cross‐beam pins. Furthermore, a closed‐form analytical model is adopted and developed to predict the critical load of these structures. The performed experiments were utilized to validate the damage mechanisms and critical displacements of the simulations and the analytically calculated maximum collapse loads. The results demonstrate that the predictions accurately capture both the critical failure load and failure mechanisms. Since the numerical results have a reasonable correlation with the experimental results and their output difference is <15%, FEM is used to investigate the collapse behavior of the pin‐reinforced foam‐filled panels. A comparison of the load–displacement, specific energy absorption (SEA), and maximum collapse loads of the samples shows that the cubic reinforced foam‐core sandwich panel has the maximum peak load and SEA. The FE model of pin‐reinforced foam‐filled panels reveals that the buckling of the reinforcements is postponed to a point beyond the critical one. Hence, PP foam can act as lateral support and delay the ultimate failure in panels, especially pin‐reinforced cylindrical sandwich panels, up to 40%.

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“…Researchers have used various methods to examine the impact properties of sandwich structures such as Charpy, [45,46] Izod, [47] and drop weight impact. [48][49][50] For sandwich structures, the most widely used of these techniques is the drop weight impact test.…”

Section: Introductionmentioning

confidence: 99%

The effect of boron carbide additive on the low‐velocity impact properties of low‐density foam core composite sandwich structures

et al. 2021

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Sandwich structures with carbon fiber-epoxy face sheets and polyvinyl chloride foam core material are known for their high strength and flexural stiffness despite their low weight. However, the structural response, in terms of crush strength, of the particles added sandwich structures are not very well known under impact loading conditions. In this study, the impact resistance and damage characteristics of particle added low weight composite sandwich structures were investigated with a low-velocity drop weight impact test device. Boron carbide (B 4 C) particles, which had excellent hardness, thermoelectric, and radiation absorbing characteristics, were used as an additive for the epoxy matrix. For this purpose, 2%, 5%, and 10% by weight additives were mixed into the epoxy matrix and sandwich structures were produced with hand lay-up followed by vacuum bagging method. All configurations were subjected to low-velocity drop weight impact test at three different energy levels (10, 17.50, and 25 J). The results obtained from the experiments and the images of the post-impact damage of the sandwich structures were presented comparatively. According to the test results, configurations containing 10% boron carbide (B 4 C) additive has shown the best performance in terms of resistance to impact load. K E Y W O R D S boron carbide (B 4 C) particles, carbon fiber reinforced polymer (CFRP), epoxy matrix modifying, low-density PVC foam core sandwich structures, low-velocity impact properties, radiation shielding barriers

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Influences of dispersion types and area densities of chopped fiber‐based interfacial reinforcements on mechanical properties of sandwich structures

Cited by 7 publications

References 31 publications

Interlaminar fracture toughness of carbon/epoxy composites laminates toughened by short carbon fiber

Interlaminar fracture toughness of carbon/epoxy composites laminates toughened by short carbon fiber

Energy absorption and collapse behavior of PP‐based pin‐reinforced composite sandwich panels under quasi‐static flatwise compression loading

The effect of boron carbide additive on the low‐velocity impact properties of low‐density foam core composite sandwich structures

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