Glass Fiber-Reinforced Polyurethane Composite Structures with Integrated Piezoelectric Sensor Elements and Corresponding Electronics

2018 ◽  
Vol 20 (12) ◽  
pp. 1800447 ◽  
Author(s):  
Sirko Geller ◽  
Thomas Tyczynski ◽  
Maik Gude ◽  
Sebastian Sauer ◽  
Wolf-Joachim Fischer
Keyword(s):  
Glass Fiber ◽  
Composite Structures ◽  
Piezoelectric Sensor ◽  
Fiber Reinforced ◽  
Polyurethane Composite ◽  
Glass Fiber Reinforced

The effect of nanoparticle additive on surface milling in glass fiber reinforced composite structures

2021 ◽  
pp. 096739112110141
Author(s):  
Ferhat Ceritbinmez ◽  
Ahmet Yapici ◽  
Erdoğan Kanca
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
Composite Structures ◽  
Fiber Composite ◽  
Cutting Speed ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Composite Layers

In this study, the effect of adding nanosize additive to glass fiber reinforced composite plates on mechanical properties and surface milling was investigated. In the light of the investigations, with the addition of MWCNTs additive in the composite production, the strength of the material has been changed and the more durable composite materials have been obtained. Slots were opened with different cutting speed and feed rate parameters to the composite layers. Surface roughness of the composite layers and slot size were examined and also abrasions of cutting tools used in cutting process were determined. It was observed that the addition of nanoparticles to the laminated glass fiber composite materials played an effective role in the strength of the material and caused cutting tool wear.

scholarly journals Fatigue performance of nanoclay filled glass fiber reinforced hybrid composite laminate

2017 ◽  
Author(s):  
◽  
John Olumide Olusanya
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Glass Fiber ◽  
Residual Strength ◽  
Composite Structures ◽  
Fatigue Performance ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

In this study, the fatigue life of fiber reinforced composite (FRC) materials system was investigated. A nano-filler was used to increase the service life of the composite structures under cyclical loading since such structures require improved structural integrity and longer service life. Behaviour of glass fiber reinforced composite (GFRC) enhanced with various weight percentages (1 to 5 wt. %) of Cloisite 30B montmorillonite (MMT) clay was studied under static and fatigue loading. Epoxy clay nanocomposite (ECN) and hybrid nanoclay/GFRC laminates were characterised using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The mechanical properties of neat GFRC and hybrid nanoclay/GFRC laminates were evaluated. Fatigue study of the composite laminates was conducted and presented using the following parameter; matrix crack initiation and propagation, interfacial debonding, delamination and S–N relationship. Residual strength of the materials was evaluated using DMA to determine the reliability of the hybrid nanoclay/GFRC laminates. The results showed that ECN and hybrid nanoclay/GFRC laminates exhibited substantial improvement in most tests when compared to composite without nanoclay. The toughening mechanism of the nanoclay in the GFRC up to 3 wt. % gave 17%, 24% and 56% improvement in tensile, flexural and impact properties respectively. In the fatigue performance, less crack propagations was found in the hybrid nanoclay/GFRC laminates. Fatigue life of hybrid nanoclay/GFRC laminate was increased by 625% at the nanoclay addition up to 3 wt. % when compared to neat GFRC laminate. The residual strength of the composite materials revealed that hybrid nanoclay/GFRC showed less storage modulus reduction after fatigue. Likewise, a positive shift toward the right was found in the tan delta glass transition temperature (Tg) of 3 wt. % nanoclay/GFRC laminate after fatigue. It was concluded that the application of nanoclay in the GFRC improved the performance of the material. The hybrid nanoclay/GFRC material can therefore be recommended mechanically and thermally for longer usage in structural application.

Displacement rate effect in the fracture toughness of glass fiber reinforced polyurethane

2020 ◽  
Vol 54 (22) ◽  
pp. 3047-3054 ◽  
Author(s):  
JML Reis ◽  
JJM Machado ◽  
EAS Marques ◽  
RJC Carbas ◽  
Lucas FM da Silva
Keyword(s):  
Glass Fiber ◽  
Composite Structures ◽  
Fracture Behavior ◽  
Double Cantilever Beam ◽  
Numerical Study ◽  
Oil Industry ◽  
Corrosion Damage ◽  
Displacement Rate ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced

Composite structures currently used in the oil industry must meet strict requirements for design and safety reasons. They need to maintain strength under varied displacement rates throughout its lifetime. It is therefore critical to fully understand the fracture behavior of such composites. This work presents experimental results regarding the influence of a range of displacement rates on the fracture energy in mode I, GIc, of glass fiber reinforced polyurethane used in the oil industry to repair and reinforce pipelines with corrosion damage. To determine GIc as a function of displacement rate, double cantilever beam specimens were tested, with displacement rates of 2, 20 and 200 mm/min with different thicknesses. A complementary numerical study was performed with the aim of predicting strength using the measured values. This work has demonstrated a significant influence of the strain rate and composite thickness on GIC of the composite materials, with higher rates and thicker specimens causing an increase in the GIC values.

scholarly journals Effect of Embedded Strain Gage on the Mechanical Behavior of Composite Structures

2017 ◽  
Vol 5 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Soufiane Belhouideg ◽  
Manuel Lagache
Keyword(s):  
Sensor Networks ◽  
Glass Fiber ◽  
Strain Gage ◽  
Composite Structures ◽  
Epoxy Composite ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Strength And Stiffness ◽  
Increased Strength

Fiber reinforced composites are increasingly used in several fields such as aeronautics and civil engineering due to their increased strength, durability, corrosion resistance, resistance to fatigue and damage tolerance characteristics. The embedding of sensor networks into such composite structures can be achieved. In the present study, glass fiber reinforced Epoxy composite with integrated strain gage was analysed. Firstly, the mechanical behaviour of this material with embedded strain gage is investigated. The as-prepared samples have been tested under tensile and flexural loading in order to study the effects of the strain gage embedding on the structural stiffness and strength of the composite. It was found that the tensile stiffness decreases by 5.8% and the tensile strength decrease by 1.5% when the strain gage embedded in the material. On the other hand, the flexural strength and stiffness is increased, respectively, by 1.5% and 5.5% with an embedded strain gage. The experiments showed that embedded strain gage is functional and demonstrated the successful integration of sensor networks into composite parts. The obtained results confirm that integrated strain gage can be used for the Structural Health Monitoring (SHM) of glass fiber reinforced Epoxy composite.

Failure mechanism of woven roving fabric/vinyl ester composites in freeze–thaw saline environment

2016 ◽  
Vol 51 (23) ◽  
pp. 3269-3280 ◽  
Author(s):  
Elias A Toubia ◽  
Sadra Emami ◽  
Donald Klosterman
Keyword(s):  
Glass Fiber ◽  
Composite Structures ◽  
Substantial Reduction ◽  
Fiber Reinforced ◽  
Saline Environment ◽  
Glass Fiber Reinforced Plastic ◽  
Freeze Thaw ◽  
Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic

This experimental study investigates the degradation mechanisms of a glass fiber-reinforced plastic material commonly used in civil engineering applications. A substantial reduction in tensile, shear, and compression properties was observed after 100 days of freeze–thaw cycling in saline environment (−20℃ to 20℃). Non-destructive inspection techniques were progressively conducted on unexposed (ambient condition) and exposed (conditioned) specimens. The dynamic mechanical analysis showed permanent decrease in storage modulus that was attributed to physical degradation of the polymer and/or fiber–matrix interface. This indicated the formation of internal cracks inside the exposed glass fiber-reinforced plastic laminate. The 3D X-ray tomography identified preferred damage sites related to intralaminar and interlaminar cracks. The ultrasonic C-scan and optical microscopy showed the nature of the damage and fibers fracture. The thermal cycling events degraded the matrix binding the warp and fill fibers, thus impairing the structural integrity of the cross-ply laminate. The result of this work could benefit a multi-scale durability and damage tolerance model to predict the material state of composite structures under typical service environments.

scholarly journals Experimental and Numerical Failure Analysis of Adhesive Joint of Glass Fiber Reinforced Polymer Composite

2019 ◽  
Vol 64 (1) ◽  
pp. 88-95
Author(s):  
László Takács ◽  
Ferenc Szabó
Keyword(s):  
Glass Fiber ◽  
Adhesive Joint ◽  
Composite Structures ◽  
Failure Process ◽  
Fiber Reinforced ◽  
Critical Energy Release Rate ◽  
Interface Elements ◽  
Normal Loading ◽  
Glass Fiber Reinforced ◽  
Standard Contact

The adhesive joint is the most widely used joining technique of thermoset composite structures. Analysis of the failure of adhesive joints of composite structures has a high importance due to its significance in industrial applications such as automobile or autobus bodies. In this paper we performed experimental and numerical analysis of a glass fiber reinforced, vinyl-ester matrix composite bonded with a methacrylate adhesive. The critical energy release rate in normal loading direction obtained from standard double cantilever beam test is used as input data in finite element simulations, in which the failure process is modeled by using cohesive zone material. Results of interface elements with exponential and standard contact elements with bilinear cohesive behavior are compared. The use of interface elements is numerically robust, convergence is reached faster, but identical mesh between the parts is needed. It can be a good alternative when simulating sub-models. When using standard contact elements, the robustness needs contact stabilization, however this method does not need identical mesh and it also allows the use of shell elements, therefore it can be used on a full-structure scale with high efficiency.

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