An experimental evaluation on the dynamic response of water aged composite/aluminium adhesive joints: Influence of electrospun nanofibers interleaving

Ulus, Hasan; Kaybal, Halil Burak; Berber, Nihat Erdem; Tatar, Ahmet Caner; Ekrem, Mürsel; Ataberk, Necati; Avcı, Ahmet

doi:10.1016/j.compstruct.2021.114852

Cited by 20 publications

(7 citation statements)

References 28 publications

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“…Previous works have indicated that the reinforcement of HNT in multi-scale composite specimens restricts matrix cracks, delamination, and fiber breakage damages created under impact loads. [20,35,36,39] Impact damage formations are constrained by toughening mechanisms of HNTs such as crack pinning and deflection, particle debonding and bridging. [35] In nanoclay addition to epoxy, the widely used reinforcing element of the clay family, improvements were also obtained for impact load performance of glass fiber composites.…”

Section: Resultsmentioning

confidence: 99%

Low‐velocity impact response of halloysite nanotube reinforced glass/epoxy multi‐scale composite. Part 1: Dynamic loading performance

Özer

Kaybal

2022

Polymer Composites

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One of the biggest obstacles to fiber-reinforced composite laminates is out-ofplane dynamic loading. Specifically, low-velocity impact loading in an out-ofplane direction leads to matrix cracking, delamination, and fiber breakage damages due to weak fiber-matrix interactions. This paper aims to examine the dynamic loading behavior of nano reinforced glass/epoxy composite laminates under various impact energies. Moreover, to enhance fiber-matrix interaction, halloysite nanotubes (HNTs) with lower cost among the nanotube morphologies such as carbon and TiO 2 were introduced to the epoxy matrix.The impact performance and the damage propagation were also investigated. As a result, the HNT-reinforced multiscale composite sample had 28% more impact load carrying capacity and absorbed 18% less energy than its unmodified counterpart. Image processing was utilized to determine the damage evaluation by analyzing both front and back surfaces. The improvement of the fiber-matrix interface with HNTs reinforcement resulted 59% and 46% less damage to the front and back damage surfaces, respectively. The acquired results were supported by macro-size examination and micro-size analyzing via scanning electron microscopy (SEM). These results pave the way towards designing fiber reinforced composites to be utilized for the transportation of dangerous liquids such as acids or solvents.

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Section: Resultsmentioning

confidence: 99%

Low‐velocity impact response of halloysite nanotube reinforced glass/epoxy multi‐scale composite. Part 1: Dynamic loading performance

Özer

Kaybal

2022

Polymer Composites

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“…Then, to form a rough surface covered with a thin aluminum oxide layer for high mechanical interlocking and adhesion performance, we utilized sulfuric acid etching and phosphoric acid anodization (hybrid surface treatment) in accordance with the ASTM D2651 and ASTM D3933, respectively. [ 29 ]…”

Section: Methodsmentioning

confidence: 99%

“…Our previous studies reported the aging mechanisms of the epoxy aged in seawater. [22,[24][25][26]29] During long-term aging, diffused water molecules weaken the hydrogen bonds of the polymer chains of the epoxy and cause an increase in chain mobility, facilitating its segmental movement under loading. This phenomenon can explain the gradual decrease in aged hybrid adhesive joints.…”

Section: Effect Of Seawater Aging On Nanomodified Adhesive's Mechanic...mentioning

confidence: 99%

Effect of long‐term stress aging on aluminum‐BFRP hybrid adhesive joint's mechanical performance: Static and dynamic loading scenarios

et al. 2022

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Composite-aluminum hybrid adhesive joints represent an ideal solution for designing lightweight structures for the marine industry. However, seawater aging is a serious concern, limiting the safe service life of the joint. Notably, efforts to understand the impact of aging have largely focused on the shortterm periods without considering actual operating conditions. Here, we report the mechanical performance of hybrid joints subjected to the long-term stress aging. Besides, we modified the epoxy adhesive with halloysite nanotubes (HNTs) to limit the aging driven adhesive degradation and improve the adhesive's rigidity. We evaluated mechanical performances of hybrid joints by performing tensile, flexural, and drop-weight impact tests. While we increased the

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“…[25][26][27][28][29] Graphene nanoplatelets (GNPs), carbon nanotubes (CNTs), nylon 6.6 nanofibers and nanosilicates are among the nanofillers being investigated to increase damage tolerance in FRP laminates after impact testing by triggering additional toughening mechanisms, including crack bridging and particle debonding. [30][31][32][33] Safamanesh et al found that incorporating the graphene oxide diminished the damaged area and improved damage tolerance, as well as the peak force and absorbed energy of the composite, were increased by 44% and 95%, respectively. [30] Dimoka et al reported that the addition of CNTs enhanced the damage tolerance are reduced the damage region, and the improvement in the nanomodified structure was almost 18% for impact energy of 8 J.…”

Section: Introductionmentioning

confidence: 99%

Assessment of damage tolerance of bolted composite structures via “bearing‐after‐impact” tests

Kaybal

2022

Polymer Composites

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Although bolted composite joints are mainly designed to resist bearing loading, dynamic loading such as low‐velocity impact can also be a severe threat because of its potential to reduce joint reliability. Surprisingly, it is still unclear how bolted composite joints perform after the dynamic loading, and its effect on the damage tolerance is unknown likewise. This study aims to evaluate experimentally the bearing‐after‐impact (BAI) damage tolerance of bolted glass‐fiber (GF) reinforced epoxy composite joints. For this, the GF/epoxy composite laminates were assembled in single‐lap shear joints firstly, and the bolted composite joints were subjected to low‐velocity impact tests at various energy levels from 3 to 10 J. Following that, standardized bearing tests were carried out to determine the damage tolerance of the laminated composites following the impact. Nanoclay fillers were also added to the epoxy matrix to improve damage tolerance. After the low‐velocity impact loading, the bearing strength diminishes by almost 22% for the bolted composite joints, while the reduction in damage tolerance is effectively limited with the nanoclay addition. However, as the impact energy increases, the efficiency of the nanofiller declines. Increased impact energy results in changes in failure modes, and nanofillers improve damage tolerance with additional nano‐scale toughness‐increasing mechanisms.

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An experimental evaluation on the dynamic response of water aged composite/aluminium adhesive joints: Influence of electrospun nanofibers interleaving

Cited by 20 publications

References 28 publications

Low‐velocity impact response of halloysite nanotube reinforced glass/epoxy multi‐scale composite. Part 1: Dynamic loading performance

Low‐velocity impact response of halloysite nanotube reinforced glass/epoxy multi‐scale composite. Part 1: Dynamic loading performance

Effect of long‐term stress aging on aluminum‐BFRP hybrid adhesive joint's mechanical performance: Static and dynamic loading scenarios

Assessment of damage tolerance of bolted composite structures via “bearing‐after‐impact” tests

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