Impact response of glass/epoxy laminate interleaved with nanofibrous mats (original) (raw)
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EFFECT OF PAN NANOfiBER INTERLEAVING ON IMPACT DAMAGE RESISTANCE OF GFRP LAMINATES
Abstract: Eight-ply composite laminates of plain and interleaved Glass/Epoxy laminates clamped according to ASTM D7136 were impact tested to assess the improvement in impact resistance of composite laminates that have been interleaved by electrospun PAN nanofiber. Composite specimens with stacking sequence [0/90/0/0] S were impacted at two different impact energies: 3 J and 5J.
Impact Damage Resistance and Tolerance of Polymer Nanofiber Interleaved Composite Laminates
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference<BR>20th AIAA/ASME/AHS Adaptive Structures Conference<BR>14th AIAA, 2012
The primary limitation of fiber reinforced composite laminates is their poor interlaminar strength and fracture toughness that result in poor impact damage resistance and tolerance. A number of methods have been tried to address this limitation. These methods are limited by factors such as increase in cost, weight, or loss of in-plane properties. A promising approach which does not degrade the in-plane properties is interleaving. Thermoplastic particle interleaving has been applied to reinforce laminates but the primary concern of in-plane properties degradation has not been addressed. Polymer nano-fiber interleaving was investigated in this dissertation as an alternative approach to particle interleaving. The concept showed promise because of the very high surface area to volume ratio and high strain to fracture of the interleaving Nylon-66 nanofibers. The objectives of the work were to determine the relationship between the electric field and the polymer flow-rate, to improve the electrospinning process, to assess lowvelocity impact damage resistance and tolerance, and to compare the performance of the base laminate to the interleaved laminate. An electrospinning setup with a collector current management technique was developed to match the electric field to the flow-rate. Twenty-four ply quasi-isotropic base and interleaved AS4/3501-6 composite laminates were produced. Interleaving was achieved with 0.7 g/m 2 nano-fabric. The impacted
Toughening Behavior of Carbon/Epoxy Laminates Interleaved by PSF/PVDF Composite Nanofibers
Applied Sciences
This paper presents an investigation on fracture behavior of carbon/epoxy composite laminates interleaved with electrospun nanofibers. Three different mats were manufactured and interleaved, using only polyvinylidene fluoride (PVDF), only polysulfone (PSF), and their combination. Mode-I and Mode-II fracture mechanics tests were conducted on virgin and nanomodified samples, and the results showed that PVDF and PSF nanofibers enhance the Mode-I critical energy release rate (GIC) by 66% and 51%, respectively, while using a combination of the two registered a 78% increment. The same phenomenon occurred under Mode-II loading. SEM micrographs were taken, to investigate the toughening mechanisms provided by the nanofibers.
In this study, the impact response of glass/epoxy laminates interleaved by Polycaprolactone (PCL) nanofibers is considered. PCL is a thermoplastic polymer, which is a good choice for toughening epoxy-based composite. The impact tests were conducted on curved laminates and under 24 and 36J. The results showed that the effect of interleaving on impact parameters such as maximum load is negligible, but on the other hand could decrease damaged area significantly. By inserting 30m of PCL nanofibers between each layer of laminate the damaged area decreased about 27%.
Composite Structures, 2014
The necessity to produce modern composites with an acceptable impact resistance is an essential task in automobile and aerospace industry that needs to be satisfied. This capability is addressed by noteworthy energy absorption augmentation which is the most vital characteristic of such composite materials. In this paper, nanofibers are applied as interleaves to modify the delamination strength with a minimum rise in weight and thickness of the high-modulus polypropylene/epoxy composites. Nylon 6,6 nanofibers are produced by the electrospinning method. The distribution of nanofibers across the mats is examined by SEM. Innegra fabrics have been applied in composite layers production. The proper hand lay-up manufacturing of the laminates has been assured by the assistance of a hydraulic press. The energy absorption capacity at the onset of breakdown and impact resistance of the nanomodified and non-modified laminates were determined by quasistatic three-point flexural for the former and low-velocity impact tests for the latter. The obtained results were compared. The results showed a 6.2 and 16.9% increase in the energy absorption capacity of nanomodified laminates in quasi-static three-point flexural test and low-velocity impact tests, respectively. In addition, low-velocity impact tests revealed 16 and 26% improvement in maximum load capacity.
In this study, the impact response of glass/epoxy laminates interleaved by Polycaprolactone (PCL) nanofibers is considered. PCL is a thermoplastic polymer, which is a good choice for toughening epoxy-based composite. The impact tests were conducted on curved laminates and under 24 and 36J. The results showed that the effect of interleaving on impact parameters such as maximum load is negligible, but on the other hand could decrease damaged area significantly. By inserting 30m of PCL nanofibers between each layer of laminate the damaged area decreased about 27%.
Compression After Impact Behavior of Electrospun Nanofiber Embedded Fiber Glass Composite Laminates
2012
This paper investigates the reduction in compressive residual strength of electrospun nanofiber embedded fiberglass reinforced composite laminates subjected to low velocity impact loading. The fiberglass laminates were fabricated using Tetra Ethyl Orthosilicate (TEOS) chemically engineered glass nanofibers. Impacted specimens were examined using C-scan analysis to estimate impact damage area. Compression-After-Impact (CAI) coupons were obtained from impact tested specimen. Specimens were tested to determine the compressive residual strength. The test data from residual compression strength were compared for the impacted laminates with and without electrospun nanofibers added to lamina interfaces.
Nanofiber Influence on Low Velocity Impact and on Vibrational Behaviors of Composite Laminate Plates
2012
Low-velocity impact (LVI) and bump tests were performed on CFR-Epoxy composite laminates which plies were interleaved with electrospun nylon nanofibers. Bump tests are performed before and after the impact event. Nanosheets are placed in between plies interfaces during the hand lay-up process for specimen manufacturing. Two different configurations of the nanomodified laminate are produced. In the present paper the following three studies were developed: (i) the investigation about the vibration behavior of nano-interleaved composite laminates, (ii) the study the low velocity impact behavior of the nano-interleaved laminates, (iii) the investigation about post impact vibration behavior of the nano-interleaved laminates. All experimental tests were done by comparing virgin and nano-interleaved composite laminates. From the experiments a significant effect of nano-interleaves on the global behavior of laminates was found. Nanofibers are able to increase the absorbing energy capabiliti...
Low-velocity impact performance of nanofiber-interlayered aramid/epoxy nanocomposites
Composites Part B-engineering, 2019
Low-velocity impact response of aramid/epoxy laminates containing nanointerlayers with different amounts of the thickness (17.5, 35, and 70 µm) and various stacking configuration (back-side, central, and two-sides interleaving) has been studied. A hand lay-up method was used for making composites. Instrumented impact tests were compared with quasi-static indentation tests by using the same specimen and test configurations. The results show that generally, quasi-static indentation analysis is sufficient to assess the impact response of interleaved composite only until a certain impact energy level. However, the optimum thickness of interleaves for obtaining the highest value of toughness for interleaved composites is 35 µm. Moreover, the behavior of backside configuration was similar to static tests in impact tests, but other configurations almost did not follow this trend.
Journal of Composites Science
In this article, the effect of polycaprolactone nanofibers on the dynamic behavior of glass fiber reinforced polymer composites is investigated. The vibratory behavior of composite beams in their pristine state (without any nano modification) and the same beams modified with polycaprolactone fibers is considered experimentally. The experimental results show that the incorporation of polycaprolactone nanofibers increases the damping; however, it does not significantly affect the natural frequencies. Additionally, the paper analyses the effect of polycaprolactone nanofibers on the impact behavior of glass fiber/epoxy composites. This has already been analyzed experimentally in a previous study. In this work, we developed a finite element model to simulate the impact behavior of such composite laminates. Our results confirm the conclusions done experimentally and prove that composites reinforced with polycaprolactone nanofibers are more resistant to damage and experience less damage wh...