scholarly journals Quasi-Static and Low-Velocity Impact Behavior of Intraply Hybrid Flax/Basalt Composites

Fibers ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 26 ◽  
Author(s):  
Fabrizio Sarasini ◽  
Jacopo Tirillò ◽  
Luca Ferrante ◽  
Claudia Sergi ◽  
Pietro Russo ◽  
...  
Keyword(s):  
Natural Fiber ◽  
Impact Response ◽  
Woven Fabric ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Absorbed Energy ◽  
Low Velocity ◽  
Matrix Type ◽  
Velocity Impact ◽  
The Matrix

In an attempt to increase the low-velocity impact response of natural fiber composites, a new hybrid intraply woven fabric based on flax and basalt fibers has been used to manufacture laminates with both thermoplastic and thermoset matrices. The matrix type (epoxy or polypropylene (PP) with or without a maleated coupling agent) significantly affected the absorbed energy and the damage mechanisms. The absorbed energy at perforation for PP-based composites was 90% and 50% higher than that of epoxy and compatibilized PP composites, respectively. The hybrid fiber architecture counteracted the influence of low transverse strength of flax fibers on impact response, irrespective of the matrix type. In thermoplastic laminates, the matrix plasticization delayed the onset of major damage during impact and allowed a better balance of quasi-static properties, energy absorption, peak force, and perforation energy compared to epoxy-based composites.

Low-velocity impact response of pre-stressed glass fiber/nanotube filled epoxy composite tubes

2020 ◽  
pp. 002199832096155
Author(s):  
Mustafa Taşyürek ◽  
Memduh Kara
Keyword(s):  
Glass Fiber ◽  
Ultrasonic Method ◽  
Energy Levels ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Velocity Impact ◽  
Force Time ◽  
The Impact

The aim of this study is to investigate the low velocity impact behavior of pre-stressed glass fiber/epoxy (GRP) nanocomposite tubes. During the production of filament wound tubes with a winding angle of ±55°, carbon nanotubes (CNT) were introduced to the epoxy resin at 0.5%wt and 1.0%wt by ultrasonic method. The nanocomposite tubes were pre-stressed to 32 bars internal pressure, one of the specified operating pressures according to ANSI/AWWA C950 standards. Low velocity impact tests were performed on the pure and CNT added pre-stressed GRP tubes at 5, 10 and 15 Joule energy levels. As a result of the experiments, the contact force-time, force-displacement graphs and absorbed energy values by the samples were obtained. In addition, the damage zones on the specimens were investigated. The effects of CNT reinforcements on the impact response and damage mechanisms of the specimens were evaluated. By adding CNT, it was observed that the damage areas of the samples decreased and was found to affect the impact response of nanocomposite tubes.

Modeling and simulation of impact behavior of 3D woven solid structure for ballistic application

2020 ◽  
pp. 152808372098046
Author(s):  
Lekhani Tripathi ◽  
Soumya Chowdhury ◽  
BK Behera
Keyword(s):  
Numerical Models ◽  
Woven Fabrics ◽  
Ballistic Impact ◽  
Woven Fabric ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact ◽  
Analytical Approaches

This study was carried out to understand and evaluate the response of 3 D woven fabrics upon the simulated ballistic forces. Under the low-velocity impact, analytical and numerical models were developed for determining the impact energy, which was used to evaluate the ballistic impact of projectile onto multiple-layered woven fabric panels based on the ballistic impact of single textile yarns. The behavior of primary and secondary yarns in a fabric under the ballistic impact was analyzed by both the models. The mechanisms of failure and energy dissipation of Kevlar fabric subjected to low-velocity impact were numerically investigated by using the ABAQUS platform as a tool of finite element method (FEM). The results obtained from numerical and analytical approaches were validated against experimental value which showed a good agreement.

scholarly journals Low-Velocity Impact Behavior of Interlayer/Intralayer Hybrid Composites Based on Carbon and Glass Non-Crimp Fabric

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2472 ◽  
Author(s):  
Chen Zhang ◽  
Yunfei Rao ◽  
Zhe Li ◽  
Wei Li
Keyword(s):  
Hybrid Composite ◽  
Composite Laminates ◽  
Hybrid Composites ◽  
Low Velocity Impact ◽  
Hybrid Structures ◽  
Impact Behavior ◽  
Absorbed Energy ◽  
Low Velocity ◽  
Velocity Impact ◽  
Impact Tests

Composites have gained wide use in structural applications; however, they are sensitive to impact damage. The use of hybrid composites is an effective way to overcome this deficiency. The effects of various hybrid structures of interlayer and intralayer warp-knitted fabrics with carbon and glass fibers on the low-velocity impact behavior of composite laminates were studied. Drop-weight impact tests were conducted on two types of interlayer, sandwich and intralayer hybrid composite laminates, which were compared with homogenous composite laminates. During low-velocity impact tests, the time histories of impact forces and absorbed energy by laminate were recorded. The failure modes were analyzed using the micro-CT (computed tomography) and C-scan techniques. The results revealed that the hybrid structure played an important role in peak force and the absorbed energy, and that the hybrid interface had an influence on damage modes, whereas the intralayer hybrid composite laminate damage was affected by the impact location. The intralayer hybrid laminate with C:G = 1:1 exhibited better impact resistance compared to the other hybrid structures.

scholarly journals Flexural Properties and Low-Velocity Impact Behavior of Polyamide 11/Basalt Fiber Fabric Laminates

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1055
Author(s):  
Libera Vitiello ◽  
Pietro Russo ◽  
Ilaria Papa ◽  
Valentina Lopresto ◽  
Davide Mocerino ◽  
...  
Keyword(s):  
Basalt Fiber ◽  
Composite Plates ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Damage Analysis ◽  
Low Velocity ◽  
Polyamide 11 ◽  
Velocity Impact ◽  
The Matrix ◽  
Fiber Fabric

Environmentally friendly composite plates intended for load-bearing applications were prepared and systematically characterized in terms of mechanical performances and morphological features. Sample plates combining two extrusion grades of bio-polyamide 11, one of which is plasticized, and two basalt fiber fabrics (plain weave and twill architectures) were obtained by film stacking and hot pressing, and their mechanical properties were investigated by quasi-static flexural and low-velocity impact tests. The comparative analysis of the results, also interpreted by the bending damage analysis, through optical microscope observations, and impact damage analysis through visual inspection and indentation measurements demonstrate that, besides interfacial adhesion issues, the mechanical performance of the laminates need to be optimized through a careful selection of the constituents in the light of the final application. In particular, if the goal is a gain in impact strength, the use of the plasticized matrix is beneficial, but it brings about a loss in stiffness and strength that can be partially compensated by properly selecting a more performing fiber fabric architecture. The latter must also be easily permeated by the matrix to enhance the efficiency of stress transfer from the matrix. Overall, our results can be exploited for the development of bio-composites for particularly demanding applications.

High temperature effect on quasi-static and low velocity impact behaviors of advanced composite materials

2021 ◽  
pp. 095440622110071
Author(s):  
Ramazan Karakuzu ◽  
Akim Djele ◽  
Akar Dogan
Keyword(s):  
Shear Strength ◽  
Testing Machine ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Test Machine ◽  
Absorbed Energy ◽  
Low Velocity ◽  
Tensile Testing Machine ◽  
Static Tests ◽  
Velocity Impact

In this study, the effect of ambient temperatures on the punch shear and low-velocity impact behavior of S2 glass fabric and carbon-kevlar hybrid fabric reinforced epoxy composites was investigated. The quasi-static tests (QST) were performed by using a Universal Shimadzu Tensile Testing Machine with various crosshead speeds. Low-velocity impact (LVI) tests were also carried out by using the CEAST Fractovis Plus impact test machine at different impact energies. Flat-nose impactors with a cylindrical punch diameter of 12.70 mm were mounted to the test machines. Both tests have been carried out at various temperatures. After the experiments, the load-displacement, the absorbed energy-impact energy/crosshead speed and punch shear strength graphs are plotted. From the obtained results it can be said that, in penetration cases of low-velocity impact and quasi-static tests, absorbed energy and punch shear strength values show similar behavior for hybrid carbon-kevlar/epoxy at each temperature except for 80 °C while these values are different from each other for S2 glass/epoxy at all temperatures.

Low velocity impact response of composites and fiber metal laminates with open holes

2016 ◽  
Vol 51 (6) ◽  
pp. 797-810 ◽  
Author(s):  
C Rubio-González ◽  
E José-Trujillo ◽  
F Chávez ◽  
A Ruiz
Keyword(s):  
Composite Plates ◽  
Impact Response ◽  
Woven Fabric ◽  
Low Velocity Impact ◽  
Critical Parameters ◽  
Low Velocity ◽  
Fiber Metal Laminates ◽  
Velocity Impact ◽  
Fiber Metal Laminate ◽  
Fiber Metal

Low-velocity impact response of glass/epoxy composite plates and fiber metal laminates with and without holes is investigated. The critical parameters that affect the delamination characteristics of laminates are impact energy, holes separation distance, type and directionality of fibers. An experimental investigation has been conducted to evaluate the effect of the presence of holes and the incorporation of aluminum layers in the extent of delamination. The extent of damage introduced during the impact event was observed on images obtained from C-scan non-destructive ultrasonic technique. Results indicate that fiber metal laminate made with aluminum layers exhibits an improved dynamic response in comparison with that of conventional laminates. The beneficial effect of using aluminum layers to reduce the extent of delamination produced by impact loading especially on laminates with holes is demonstrated. Furthermore, fiber metal laminates show better load carrying capability than conventional composite plates. The better response of fiber metal laminate with multidirectional fabric in comparison with fiber metal laminate with woven fabric is also examined. These results may be useful to better design the location of holes in composite structures.

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