scholarly journals Experimental and Numerical Analysis of the Deformation Behavior of Adaptive Fiber-Rubber Composites with Integrated Shape Memory Alloys

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 582
Author(s):  
Felix Lohse ◽  
Karl Kopelmann ◽  
Henriette Grellmann ◽  
Moniruddoza Ashir ◽  
Thomas Gereke ◽  
...  
Keyword(s):  
Shape Memory ◽  
Biomedical Applications ◽  
Experimental Tests ◽  
Rubber Matrix ◽  
Fiber Reinforced ◽  
Rubber Composites ◽  
Four Point Bending ◽  
Glass Fiber Reinforced ◽  
Liquid Silicone ◽  
Good Agreement

Fiber-reinforced rubber composites with integrated shape memory alloy (SMA) actuator wires present a promising approach for the creation of soft and highly elastic structures with adaptive functionalities for usage in aerospace, robotic, or biomedical applications. In this work, the flat-knitting technology is used to develop glass-fiber-reinforced fabrics with tailored properties designed for active bending deformations. During the knitting process, the SMA wires are integrated into the textile and positioned with respect to their actuation task. Then, the fabrics are infiltrated with liquid silicone, thus creating actively deformable composites. For dimensioning such structures, a comprehensive understanding of the interactions of all components is required. Therefore, a simulation model is developed that captures the properties of the rubber matrix, fiber reinforcement, and the SMA actuators and that is capable of simulating the active bending deformations of the specimens. After model calibration with experimental four-point-bending data, the SMA-driven bending deformation is simulated. The model is validated with activation experiments of the actively deformable specimens. The simulation results show good agreement with the experimental tests, thus enabling further investigations into the deformation mechanisms of actively deformable fiber-reinforced rubbers.

scholarly journals Strengthening Reinforced Concrete Beams with CFRP and GFRP

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mehmet Mustafa Önal
Keyword(s):  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Strength Increase ◽  
Fiber Reinforced ◽  
Flexural Stress ◽  
Four Point Bending ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Reinforced Beams

Concrete beams were strengthened by wrapping the shear edges of the beams twice at 45° in opposite directions by either carbon fiber reinforced polymer (CFRP) or glass fiber reinforced polymer (GFRP). The study included 3 CFRP wrapped beams, 3 GFRP wrapped beams, and 3 control beams, all of which were 150×250×2200 mm and manufactured with C20 concrete and S420a structural steel at the Gazi University Technical Education Faculty labs, Turkey. Samples in molds were cured by watering in the open air for 21 days. Four-point bending tests were made on the beam test specimens and the data were collected. Data were evaluated in terms of load displacement, bearing strength, ductility, and energy consumption. In the CFRP and GFRP reinforced beams, compared to controls, 38% and 42%, respectively, strength increase was observed. In all beams, failure-flexural stress occurred in the center as expected. Most cracking was observed in the flexural region 4. A comparison of CFRP and GFRP materials reveals that GFRP enforced parts absorb more energy. Both materials yielded successful results. Thicker epoxy application in both CFRP and GFRP beams was considered to be effective in preventing break-ups.

Flexural performance of composite grid panels with deep ribs

2020 ◽  
Vol 39 (11-12) ◽  
pp. 443-458
Author(s):  
Jiye Chen ◽  
Hai Fang ◽  
Feng Gao ◽  
Weiqing Liu
Keyword(s):  
Glass Fiber ◽  
Bending Stiffness ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Flexural Performance ◽  
Four Point Bending ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Composite Grid

This paper reports on the flexural performance of an innovative composite grid panel composed of glass fiber-reinforced polymer face skins and deep glass fiber-reinforced polymer ribs with a trapezoidal cross-section. Three-point and four-point bending experiments were performed to demonstrate the feasibility of the composite grid panels under concentrated loads. Compared with the composite grid panels without skins, maximum increases in the ultimate load, and initial bending stiffness of the composite grid panels of approximately 68.2% and 306.7%, respectively, were achieved with the existence of both upper and lower skins. Furthermore, an analytical analysis was carried out to predict the initial bending stiffness and mid-span deflection of the composite grid panels. A comparison of the analytical and experimental results showed that the analytical model accurately predicted the flexural performance of the composite grid panels subjected to three-point and four-point bending. Failure mechanism maps were constructed to predict the mechanical response and failure modes of the composite grid panels. Moreover, the validated model was used in a parametric analytical study to further estimate the effects of various parameters on the flexural performance of the composite grid panels. The results demonstrated that the initial bending stiffness can be significantly improved by increasing the trapezoidal section ratio, face skin thickness, and grid height.

scholarly journals Extended Finite Element Numerical Analysis of Scale Effect in Notched Glass Fiber Reinforced Epoxy Composite

2015 ◽  
Vol 62 (2) ◽  
pp. 217-236 ◽  
Author(s):  
Mohammed Y. Abdellah ◽  
Mohammad S. Alsoufi ◽  
Mohamed K. Hassan ◽  
Hamza A. Ghulman ◽  
Ahmed F. Mohamed
Keyword(s):  
Finite Element ◽  
Size Effect ◽  
Glass Fiber ◽  
Scale Effect ◽  
Fracture Process ◽  
Fiber Reinforced ◽  
Extended Finite Element ◽  
Glass Fiber Reinforced ◽  
Nominal Strength ◽  
Good Agreement

Abstract Nominal strength reduction in cross ply laminates of [0/90]2s is observed in tensile tests of glass fiber composite laminates having central open hole of diameters varying from 2 to 10 mm. This is well known as the size effect. The extended finite element method (XFEM) is implemented to simulate the fracture process and size effect (scale effect) in the glass fiber reinforced polymer laminates weakened by holes or notches. The analysis shows that XFEM results are in good agreement with the experimental results specifying nominal strength and in good agreement with the analytical results based on the cohesive zone model specifying crack opening displacement and the fracture process zone length

Compression after ballistic impact response of pseudoelastic shape memory alloy embedded hybrid unsymmetrical patch repaired glass-fiber reinforced polymer composites

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4225-4247 ◽  
Author(s):  
Luv Verma ◽  
Srinivasan M Sivakumar ◽  
Jefferson J Andrew ◽  
G Balaganesan ◽  
A Arockirajan ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Glass Fiber ◽  
Fiber Reinforced Polymer ◽  
Impact Response ◽  
Patch Repair ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

This paper investigated the influence of embedding pseudoelastic shape memory alloy within the external bonded patch made up of glass fibers on the compression after impact response of adhesively bonded external patch repaired glass/epoxy composite laminates. Unsymmetrical patch repair was employed in the current studies. Three innovative pseudoelastic shape memory alloy configurations (straight wired, meshed and anchored) were embedded inside the patch and the changes in high-velocity impact response and damage tolerance at four impact velocities (70, 85, 95, 105 m/s) were compared with the conventional glass/epoxy (glass fiber-reinforced polymer) patch. Anchored specimens showed the best response by improving the compressive strength by 25% under non-impacted conditions and restoring it by 88%, 77%, 29%, and 28% at the impact velocity of 70, 85, 95, and 105 m/s, respectively, in comparison to the conventional normal specimens.

Short Jute Fiber Reinforced Rubber Composites

1982 ◽  
Vol 55 (2) ◽  
pp. 287-308 ◽  
Author(s):  
V. M. Murty ◽  
S. K. De
Keyword(s):  
Jute Fiber ◽  
Rubber Matrix ◽  
Fiber Reinforced ◽  
Volume Percent ◽  
Rubber Composites ◽  
Volume Loading ◽  
Fiber Loading ◽  
Natural Rubber Composites ◽  
Aging Resistance ◽  
Reinforcing Filler

Abstract The following conclusions can be drawn from the above results and discussion: (1) The bonding between jute fiber and rubber matrix is poor without any bonding agent. (2) Addition of 5 phr silica is essential and sufficient for promoting adhesion between fiber and matrix of a mix containing 5 phr resorcinol and 3.2 phr (3) The jute fiber will act as a reinforcing filler only when added above a volume loading of 10 percent. (4) The aging resistance of jute fiber reinforced natural rubber composites is excellent beyond a fiber loading of 10 volume percent.

scholarly journals Probability prediction of tensile strength with acoustic emission count of a glass fiber reinforced polyamide

2018 ◽  
Vol 19 (1) ◽  
pp. 110
Author(s):  
Mohamed Makki Mhalla ◽  
Ahmed Bahloul ◽  
Chokri Bouraoui
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Probabilistic Approach ◽  
Experimental Tests ◽  
Fiber Content ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Strength Behavior ◽  
Input Parameters ◽  
Probability Prediction

The aim of this paper is to develop a probabilistic approach for predicting the tensile strength behavior of a glass fiber reinforced polyamide. In the present study, the reliability of tensile strength is proposed based on the developed mathematical models, in which three factors with three levels are implemented. Glass fiber content, temperature and strain rate are chosen as the main input parameters in this study. The tensile strength is considered as output response which is evaluated through experimental tests. The “Strength-Load” method with Monte Carlo simulation is implemented for computing the tensile strength reliability. The proposed approach leads to predict useful the tensile strength behavior for different parameters. In addition, a sensitivity analysis of some input parameters on the reliability is discussed. This method has been also used to analyze and discuss the influence of the dispersions of the glass fiber content and the temperature of a glass fiber reinforced polyamide.

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