Vibrational analyses of glass-reinforced polyester composite plates reinforced by a minimum mass central stiffener

Attaf, B; Hollaway, L.

doi:10.1016/0010-4361(90)90442-y

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…6(a). The deformed shape will indicate the areas of maximum displacements where fibre orientation and longitudinal stiffeners could be tailored to reduce the high displacements [16]. As it can be seen from Fig.…”

Section: Structural Shell Deflectionmentioning

confidence: 89%

Eco-technique of sewer renovation using composite shells: structural analysis

Attaf¹

2015

J. Fundam and Appl Sci.

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An eco-technical renovation of the sewage system is developed in this paper; this technique involves incorporating into the existing sewer a series of jointed prefabricated sandwich or composite shells. The purpose of his study is to determine the structural shell deflection, the high displacement areas and to validate the non-failure criterion for each ply constituting the inner and outer laminate facings. The numerical results were obtained at low cost by using the finite element method. Studies have focused on structural analysis of a typical shell unit with an ovoid form (egg-shaped section) when it is subjected, during annular space filling operation, to pressure forces generated by wet concrete. To ensure the safety of the composite shell structure, Tsai-Hill criterion function is applied and results are presented for the most stressed plies.Key words: sanitation; sustainable development; composite collector en composite; sandwich shell; finite element approach. INTRODUCTIONIn some large and older cities, the underground collectors of sewage were built with bricks and are now showing signs of ageing behaviour and fatigue [1][2][3]. This situation requires therefore particular attention to assess the sewer's structural state. In addition, J Fundam Appl Sci. 2011, 3(2), 144-154 145 Large underground drain-pipes are able to collect and remove wastewater and surface water from populated areas to sewage treatment works for water sustainability and advanced recycling (Fig. 1). But the inevitable leaks in the drainage system, mainly due to the ageing behaviour of such structures, the poor tightness and the fatigue phenomenon can pollute groundwater and therefore contaminate drinking water supplies and agriculture soils [6]. This environmental pollution can cause a number of risks to human health and the environment and becomes a source of several diseases such as diarrhea, typhoid, cholera, hepatitis, malaria [7]. Fig.1. Sewage systemIn order to overcome this problem and minimize or drastically reduce these risks, an innovative technique for the renovation of existing sewage systems is presented in this article. This technique involves incorporating into the existing sewer a series of jointed prefabricated composite shells [8]. The new shell cross-section is practically the same as the existing sewer with a small reduction in size. The reduction in the hydraulic crosssection is counterbalanced by the shell ultra-smooth surface which reduce friction to fluid flow [9]. In addition, the annular space (void) between the composite shell and the existing collector is filled with concrete [8,10].It should be noted that in the sanitation domain, the use of cross-section with an ovoid form (egg-shaped section) is highly recommended, because this shape prevents sedimentation phenomenon as a result of high-speed water with low flow in the narrow side of the collector (lower part of the shell). For that reason, a composite shell with an ovoid cross-section has been adapted to the current situation. Studies were ...

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Section: Structural Shell Deflectionmentioning

confidence: 89%

Eco-technique of sewer renovation using composite shells: structural analysis

Attaf¹

2015

J. Fundam and Appl Sci.

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“…Composite stiffened plates with rectangular stiffeners are analyzed using the present approach. Attaf and Hollaway [15] have analyzed the same structure made of glass/ polyester materials for various plate thickness and stiffener dimension using ABAQUS software package. The software package models the stiffened plate as an assemblage of four noded isoparametric flat shell elements.…”

Section: Numerical Examples Example 1: Composite Plate Stiffened With Rectangular Stiffenersmentioning

confidence: 99%

Free Vibration Analysis of Composite Hat-stiffened Panels By Method of Finite Elements

Prusty

Ray

2004

Journal of Reinforced Plastics and Composites

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Free vibration analysis of laminated composite plates/shells stiffened with ‘open’ and ‘closed’ type sections as stiffeners have been carried out in the present investigation. The plate/shell has been analyzed using eight noded isoparametric shell elements and the stiffeners have been modeled using three noded isoparametric curved beam elements. There is no restriction on the positioning of stiffener elements within a shell element. The stiffness and mass matrices of the stiffener and plate/shell elements are calculated irrespective of the stiffener position within the shell element. A unified formulation describing the rigidity matrix of laminated stiffeners having open (rectangular, ‘T’, ‘L’, and ‘I’ shaped) and closed type (hat or box shaped) sections has been presented. Free vibration analysis of laminated plates/shells with open and closed section stiffeners have been analysed using the method of finite elements. Numerical results for the free vibration analysis solved by the present formulation are presented and compared with published results.

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“…In the modern manufacturing industry of wind turbine blades [1], fibre-reinforced composite materials are chosen among other available engineering materials because of their significant and attractive advantages in terms of stiffnessand strength-to-weight ratio, thermal and chemical resistance properties, coupled with material cost effectiveness [2]. In addition to the economic advantage and technicalquality efficiency, further ecological aspects are still required in order to green up the moulding processes and this after an appropriate selection of matrix resin and fibre materials that are answering questions related to environmental and safety issues.…”

Section: Introductionmentioning

confidence: 99%

Ecomoulding of Composite Wind Turbine Blades Using Green Manufacturing RTM Process

Attaf¹

2012

ISRN Materials Science

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According to ecodesign considerations and green manufacturing requirements, the choice of moulding process for the production of composite wind turbine blades must provide the existence of a common area of intersection engendered by a simultaneous interaction between quality, health, and environment aspects (i.e. Q, H, and E for abbreviations, resp.). This common area can be maximized via ecoalternatives in order to minimize negative adverse environmental and/or human health impacts. With this objective in mind, the closed-mould manufacturing RTM (resin transfer moulding) process will be the subject matter of this investigation. The reason for this choice is that RTM process participates in the reduction of VOC (volatile organic compound) emissions such as styrene vapours and presents an industrial solution to wind turbine blades production coupled with high quality finishing, good mechanical properties, lower cost, and a total absence of bonding operation of half shells. In addition to these advantages, sustainable development issues and ecodesign requirements are still, however, the main objectives to be fulfilled in this analysis with an acceptable degree of tolerance to the new regulations and ecostandards leading the way for green design of composite wind turbine blades.

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Vibrational analyses of glass-reinforced polyester composite plates reinforced by a minimum mass central stiffener

Cited by 6 publications

References 6 publications

Eco-technique of sewer renovation using composite shells: structural analysis

Eco-technique of sewer renovation using composite shells: structural analysis

Free Vibration Analysis of Composite Hat-stiffened Panels By Method of Finite Elements

Ecomoulding of Composite Wind Turbine Blades Using Green Manufacturing RTM Process

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