An experimental study on low velocity impact performance of bolted composite joints part 1: Influence of halloysite nanotubes on dynamic loading response

Kaybal, Halil Burak; Ulus, Hasan; Eskizeybek, Volkan; Avcı, Ahmet

doi:10.1016/j.compstruct.2020.113415

Cited by 29 publications

(40 citation statements)

References 39 publications

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“…So, it is needed to explain that the HNTs from the same deposit is used in previous studies and showed excellent mechanical properties on quasi-static penetration, tensile, compression, flexural, impact, and fracture F I G U R E 1 Schematic of carbon-aramid hybrid composite production tests. [6,27,48,50,51,55] In addition, the same HNTs are used as ethylene gas absorbers for active food packaging materials (HNTs/polyethylene nanocomposites) [56] and used for producing poly(MPAEMA)/halloysite nanocomposites to obtain a non-cytotoxic response possible application for medicine, agriculture, cosmetics industries. [57] HNTs are received as nanoparticles having an inner diameter of 10-30 nm, an outer diameter of 30-100 nm and an average length of 1.2 μm.…”

Section: Fabrication Of Carbon-aramid Fiber Hybrid Compositesmentioning

confidence: 99%

“…[ 6] It is presented in the literature that 2 wt% HNTs into the epoxy matrix, which we used the same type in this study, showed the highest mechanical properties under various loading conditions. [27,[48][49][50][51] So, 2 wt% HNTs reinforcement is chosen to conduct experiments in this paper. The HNTs/ epoxy blend is added to the curing agent and mixed for 10 min before the composite fabrication.…”

Section: Fabrication Of Carbon-aramid Fiber Hybrid Compositesmentioning

confidence: 99%

“…Additionally, the mechanical behavior improvement of fiber-reinforced composites loading with HNTs is attributed to crack pinning, crack bridging, crack deflection-toughening mechanisms because of the high aspect ratios of HNTs. [27,[48][49][50][51] The wear resistance of fiber-reinforced plastic composites sliding against abrasive steel balls is improved when the matrix is reinforced with aramid or carbon fibers. [52,53] However, hybridizing carbon and aramid fibers and strengthening the matrix with HNTs improve the tribological behavior of composite materials.…”

Section: Introductionmentioning

confidence: 99%

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The effect of halloysite nanotube modification on wear behavior of carbon‐aramid fiber reinforced hybrid nanocomposites

et al. 2021

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In this study, the carbon-aramid fiber reinforced hybrid composites are fabricated using a vacuum-assisted hand lay-up method using halloysite nanotubes (HNTs) modified epoxy matrix. Ball-on-disk wear tests are performed to analyze the tribological effect of neat and HNTs-added specimens at 10, 15, and 20 N loads and 1 m/s sliding speed. Additionally, the wear rate and friction coefficient results are obtained to investigate the effect of the HNTs on the tribological behavior of hybrid composites. The wear mechanism of neat and nanocomposite specimens is specified by scanning electron microscopy (SEM) images, and the elemental analysis of worn surfaces is performed using EDX. Finally, the surface morphology is evaluated with 3D topography images.Additionally, thermal camera images are used to identify the thermal conductivity effect of HNTs on wear. The wear test results show that HNTs-addition to composite decreased the friction coefficient by 9%, 10%, and 11% for 10 N, 15 N, and 20 N loadings, respectively. The wear rate is also decreased average by 75% for wear loadings. Surface form images acquired from 3D topography

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Section: Fabrication Of Carbon-aramid Fiber Hybrid Compositesmentioning

confidence: 99%

Section: Fabrication Of Carbon-aramid Fiber Hybrid Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of halloysite nanotube modification on wear behavior of carbon‐aramid fiber reinforced hybrid nanocomposites

et al. 2021

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“…[ 3–5 ] Furthermore, such loading can also lead to matrix cracks under the washer. [ 6,7 ] Despite receiving a visible impact, it is expected that the jointed composite structure has to maintain the bearing load, which is described as damage tolerance. [ 2,6 ]…”

Section: Introductionmentioning

confidence: 99%

“…[ 2,22,23 ] Moreover, the resulting damage formations can propagate to a more dangerous extent under dynamic loading and seriously weaken the BCJs' damage tolerance and reliability. [ 6 ]…”

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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Nonpenetrating repeated impact effect to the damage behavior of prestressed glass/epoxy composite pipes

2022

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Glass-reinforced plastic (GRP) composite pipes, the use of which has been increasing rapidly in many areas in recent years, may be exposed to the impact of different objects during assembly, operation, repair, and maintenance. Since composite materials are sensitive to impacts, it is vital to examine damage to the material. In this study, the repeated impact response of GRP composite pipes under internal hydrostatic pressure was investigated. In order to simulate different operating conditions on the GRP samples, a prestress was created by applying 4, 16, and 32 bar internal hydrostatic pressure. Then, the prestressed pipes were subjected to low velocity repeated impact tests. As a result of repeated impact tests at low velocity, changes in maximum displacement amount, maximum contact force, energy absorption capacity, and impact velocity were evaluated depending on the number of impacts applied to the samples. The changes in the strength of the samples subjected to repeated impact tests at different internal pressure levels were determined by the hoop tensile tests performed according to the ASTM D2290 standard. As a result of the hoop tensile tests, the variation of the material's tangential tensile strength and damage behavior according to impacts' number and the prestress were investigated.

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An experimental study on low velocity impact performance of bolted composite joints part 1: Influence of halloysite nanotubes on dynamic loading response

Cited by 29 publications

References 39 publications

The effect of halloysite nanotube modification on wear behavior of carbon‐aramid fiber reinforced hybrid nanocomposites

The effect of halloysite nanotube modification on wear behavior of carbon‐aramid fiber reinforced hybrid nanocomposites

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

Nonpenetrating repeated impact effect to the damage behavior of prestressed glass/epoxy composite pipes

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