Pultrusion of a vertical axis wind turbine blade part-II: combining the manufacturing process simulation with a subsequent loading scenario

Baran, İsmet; Hattel, Jesper Henri; Tutum, Cem Celal; Akkerman, Remko

doi:10.1007/s12289-014-1178-7

Cited by 16 publications

(11 citation statements)

References 28 publications

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“…The NACA0018 airfoil profile was considered in [ 155 – 157 ]. The residual stresses were predicted for the pultrusion process of the blade profile in [ 157 ]. It was found that the transient normal stresses in the pulling direction were higher than the normal stresses in the transverse direction inside the die.…”

Section: Applications To Thermosetting Compositesmentioning

confidence: 99%

A Review on the Mechanical Modeling of Composite Manufacturing Processes

Baran

Çınar

Ersoy

et al. 2016

Arch Computat Methods Eng

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255

168

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The increased usage of fiber reinforced polymer composites in load bearing applications requires a detailed understanding of the process induced residual stresses and their effect on the shape distortions. This is utmost necessary in order to have more reliable composite manufacturing since the residual stresses alter the internal stress level of the composite part during the service life and the residual shape distortions may lead to not meeting the desired geometrical tolerances. The occurrence of residual stresses during the manufacturing process inherently contains diverse interactions between the involved physical phenomena mainly related to material flow, heat transfer and polymerization or crystallization. Development of numerical process models is required for virtual design and optimization of the composite manufacturing process which avoids the expensive trial-and-error based approaches. The process models as well as applications focusing on the prediction of residual stresses and shape distortions taking place in composite manufacturing are discussed in this study. The applications on both thermoset and thermoplastic based composites are reviewed in detail.

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Section: Applications To Thermosetting Compositesmentioning

confidence: 99%

A Review on the Mechanical Modeling of Composite Manufacturing Processes

Baran

Çınar

Ersoy

et al. 2016

Arch Computat Methods Eng

Self Cite

255

168

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“…During the elastic stress stage, the maximum compressive strains on specimens P-C-1, P-C-2 and P-C-3 were 0.00235, 0.00142 and 0.00119, respectively, with an average value of 0.00162 and a variable coefficient of 28.2%, indicating that the components of this type exhibited rather large individual differences. The primary cause of this broad variation was that these were hollow thin-walled components that suffered from a variety of initial defects originating from the pultrusion process [ 7 – 9 ]. These initial defects had a significant impact on the distribution of internal force and, as a result, influenced the bearing capacities and failure modes of the specimens.…”

Section: Analysis and Discussion Of The Results Of The Axial Compressmentioning

confidence: 99%

“…Generally speaking, after unidirectional (UD) roving and continuous filament mat (CFM) layers are impregnated with a polyester resin, they are fed into a die and cured at a high temperature to form a pultruded FRP profile [ 5 , 6 ]. Although the pultrusion process is, in principle, a simple one, pultrusion faces certain crucial challenges in practice, such as residual stresses in the product that may induce damage or premature cracking and delamination [ 7 – 9 ]. Scholars have conducted many studies on the pultrusion process, as well as the basic mechanical performance of pultruded FRP profiles, their corrosion resistance, and their creep properties [ 10 – 15 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Flexural and Compression Performance of an Innovative Pultruded Glass-Fiber-Reinforced Polymer-Wood Composite Profile

et al. 2015

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The plate of a pultruded fiber-reinforced polymer or fiber-reinforced plastic (FRP) profile produced via a pultrusion process is likely to undergo local buckling and cracking along the fiber direction under an external load. In this study, we constructed a pultruded glass-fiber-reinforced polymer-light wood composite (PGWC) profile to explore its mechanical performance. A rectangular cross-sectional PGWC profile was fabricated with a paulownia wood core, alkali-free glass fiber filaments, and unsaturated phthalate resin. Three-point bending and short column axial compression tests were conducted. Then, the stress calculation for the PGWC profile in the bending and axial compression tests was performed using the Timoshenko beam theory and the composite component analysis method to derive the flexural and axial compression rigidity of the profile during the elastic stress stage. The flexural capacity for this type of PGWC profile is 3.3-fold the sum of the flexural capacities of the wood core and the glass-fiber-reinforced polymer (GFRP) shell. The equivalent flexural rigidity is 1.5-fold the summed flexural rigidity of the wood core and GFRP shell. The maximum axial compressive bearing capacity for this type of PGWC profile can reach 1.79-fold the sum of those of the wood core and GFRP shell, and its elastic flexural rigidity is 1.2-fold the sum of their rigidities. These results indicate that in PGWC profiles, GFRP and wood materials have a positive combined effect. This study produced a pultruded composite material product with excellent mechanical performance for application in structures that require a large bearing capacity.

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“…It was found that the thermal diffusivity, thermal conductivity, and specific heat properties are decreased with an increase in the fiber loading. The temperature and cure evolutions are carried out by Baran et al 10,11 who stated that the manufacturing process parameters have direct influence in the possibility of producing defects and process-induced residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Thermo-physical properties of short banana–jute fiber-reinforced epoxy-based hybrid composites

Devireddy

Biswas

2016

Proceedings of the Institution of Mechanical Engineers, Part L:

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The utilization of natural fiber-reinforced polymer composites is rapidly increasing in many industrial applications and fundamental research. In this work, short banana-jute fiber-reinforced epoxy-based hybrid composite was prepared by varying the fiber loading (0-40 wt.%) and different weight ratios of banana and jute fiber (1:1, 1:3, and 3:1). The physical and thermal properties such as density, water absorption, thermal conductivity, specific heat and thermal diffusivity were evaluated as per ASTM standards. A new micromechanical model was developed for evaluating the effective thermal conductivity of short fiber-reinforced hybrid composites by using the law of minimal thermal resistance and equal law of specific equivalent thermal conductivity. The thermal conductivity was calculated numerically by using the steady state heat transfer simulations. The proposed model and numerical results were validated with the experimental results and analytical methods existing in the literature. The effective thermal conductivity was predicted with the proposed model, and the finite element method is in good agreement with the experimental values and observed an acceptable range of 0-6.5% and 0-11% error, respectively. The results reveal that the composite made with banana and jute in the weight ratio of 1:3 shows minimum void content, water absorption, thermal conductivity, and thermal diffusivity at all fiber loadings. The fabricated hybrid composites were suitable for building components and automobiles in order to reduce the energy consumption.

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Pultrusion of a vertical axis wind turbine blade part-II: combining the manufacturing process simulation with a subsequent loading scenario

Cited by 16 publications

References 28 publications

A Review on the Mechanical Modeling of Composite Manufacturing Processes

A Review on the Mechanical Modeling of Composite Manufacturing Processes

Experimental Study of the Flexural and Compression Performance of an Innovative Pultruded Glass-Fiber-Reinforced Polymer-Wood Composite Profile

Thermo-physical properties of short banana–jute fiber-reinforced epoxy-based hybrid composites

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