Influence of winding pattern on the mechanical behavior of filament wound composite cylinders under external pressure (original) (raw)
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A study was made to determine the mechanical behavior of boron-epoxy and S-glass-epoxy filament-wound cylinders under tensile, compressive, torsional, and pressure loads. These cylinders were fabricated in either an orthotropic winding pattern or an isotropic pattern. Conventional theory used to predict the elastic behavior of glassepoxy filament-wound cylinders was discovered to be equally adequate for the boronepoxy cylinders. Since Young's modulus for a boron filament is much greater than that for a glass filament , the boron-epoxy cylinders were considerably stiffer than those of glass-epoxy. Atte mpts to correlate cylinder failure strengths calculated from existing state-of-the-art theories with experimental failure strengths met with varying success. Thus, additional research is necessary before failure characteristics of filament-wound composite cylinders, either glass-or boron-reinforced can be accurately predicted.
Development of a new generation of filament wound composite pressure cylinders
Composites Science and Technology, 2009
A new generation of composite pressure vessels for large scale market applications has been studied in this work. The vessels consist on a thermoplastic liner wrapped with a filament winding glass fibre reinforced polymer matrix structure. A high density polyethylene (HDPE) was selected as liner and a thermosetting resin was used as matrices in the glass reinforced filament wound laminate.
Composite Structures, 2002
In this study filament winding patterns are simulated using semi-geodesic fiber path equation for an arbitrary surface. As the fiber path depends on the surface where fibers are wound, the fiber angle varies in the longitudinal and thickness directions of a pressure tank. Finite element analyses are performed considering fiber angle variation in the longitudinal and thickness directions by ABAQUS. From the stress results of pressure tanks, maximum stress criterion in the transverse direction is applied to modify material properties of failed region. At the end of each load increment, resultant layer stresses are compared with a failure criterion and the mechanical properties are reduced to 1/10 for the failed layer. Results of progressive failure analysis are compared with two experimental data. Parametric studies such as the boss to cylinder radius ratio, R b /R c , thickness, and winding angle are done to investigate their effects on the performance of pressure tanks.
In this work, damage and failure in carbon fiber reinforced epoxy filament wound composite tubes were thoroughly evaluated through a proposed damage model, which is able to identify different failure modes. Moreover, a non-linear finite element model based on the arc length method was developed. The tubes were manufactured via dry-filament winding using T700 towpregs, and subjected to external pressure tests to evaluate computational analyses. Numerical results indicated that the tubes with a diameter-to-thickness ratio (d/t) lower than 20:1 fail by buckling, whereas the tube [90 ± 55 12 /90], which has a higher d/t ratio presented failure primarily driven by in-plane shear, with delaminations. These results were compared with experimental tests, and relative differences in external pressure strengths were lower than 8.4%. The developed model presented a low computational cost and a very good agreement with experimental results, being very attractive to both academic and industrial sectors.
Composites Part B: Engineering, 2018
Identification of the boundary between failure by buckling, collapse and material failure in cylindrical tubes under axial compression is still challenging. The focus of this research is to investigate the response of carbon/epoxy filament wound cylindrical tubes under axial compression. Three approaches have been studied: (i) linear buckling; (ii) nonlinear buckling; and (iii) progressive damage modeling (PDM). For that, analytical, numerical and experimental approaches have been followed. Key results show that thinner tubes fail by buckling followed by a post-buckling field, whereas material failure due to transverse compression and in-plane shear stresses occur for thicker tubes. Both analytical and linear numerical models predicted very well the critical buckling load for all [±α] tubes, and nonlinear buckling model satisfactorily predicted axial displacement over the loading history. For multilayered tubes, the developed damage model provided better predictions compared to the nonlinear buckling model. Furthermore, for thicker tubes, a hoop layer at the outermost, instead of middle or innermost, improves buckling/compressive resistance.
Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium, 2013
Industrial applications, especially composite structures bearing high internal pressure, and fabricated using the filament winding process face certain difficulties like the reinforcement of complex shapes, as well as the correct placement of fibers over the surface of a mandrel. In some cases the definition of the manufacturing parameters respond more to cost or time criteria rather than engineering standards, reducing largely the advantages of the said manufacturing process. In order to overcome these obstacles, this research aims to propose a solution that permits to fabricate complex shapes with the desired winding angles at a certain region of complex-shaped mandrels. A numerical tool that simulates the placement of fiber tows over the surface of complex geometries is developed and validated by means of the fabrication of convex and concave composite structures using detachable mandrels. Previous results show that it is feasible to wind complex geometries with good accuracy.
EXPERIMENTAL CHARACTERIZATION OF FILAMENT WOUND GLASS/EPOXY AND CARBON/EPOXY COMPOSITE MATERIALS
Composites have been used extensively in application such as pipes and pressure vessels. Therefore there is a need for further studies on the properties of these materials. This paper presents the results from a series of tensile tests on the mechanical properties of composite materials. Specimens cut from pipes made from composite materials were tested under internal pressure loadings have been tested by using a series of ASTM Standards test methods for mechanical properties. Based on the results obtained, the longitudinal E 11 , transverse E 22 and shear modulus G 12 of 101.2 GPa, 5.718 GPa, 4.346 GPa and 36.6, 5.4 GPa, 4.085 GPa for carbon and glass fiber/ epoxy composites, respectively, while the ultimate longitudinal X L , transverse X T and shear tensile τ 0 strengths of 1475.4 MPa, 20 MPa, 36 MPa and 618.9 MPa, 14 MPa, 28 MPa for carbon and glass fiber/epoxy composites, respectively. The results from this series of tests have been presented and compared with results from analytical equations. Good agreement was achieved between the experimental results and analytical results.
Theoretical stress and strain distribution across thick — walled filament wound composite
Summary -Monolithic thick cylinder theory with linear elastic orthotropic laminate properties was employed successfully to predict the inside and outside surface strains. While applying the theory to thick-walled tubes it is necessary to consider the different states of stress and strain on the inside and outside surfaces and to consider the effect of radial stress. Three-dimensional stress analysis was used throughout and is presented for general interest in a form suitable for computer application. Numerical example was used to compare the results obtained from the equations with the results obtained with use of CompositePro software and good agreement was achieved between them both. Key words: thick-walled filament wound composite tubes, three-dimensional stress and strain analysis, orthotropic laminate.
Journal of Reinforced Plastics and Composites-2005-Akcay-1169-79
In this investigation, a failure analysis is performed on analytical expressions of multilayered filament wound structures (FWS) in composite cylinders for the plane-strain and closed-end condition cases, under internal pressure and uniform thermal loading. The multilayer filament wound composite pressure closed-end cylinders are oriented symmetrically and antisymmetrically. The mechanical properties of composite cylinders are investigated considering a glass-epoxy multilayered composite cylinder. The failure analysis is carried out on different orientations of the multilayered composite cylinders. The failure pressure is found to be high at increased temperatures for the plane-strain cases. It is nearly the same for the closed-end case.
Design, modeling, optimization, manufacturing and testing of variable-angle filament-wound cylinders
Composites Part B: Engineering, 2021
This work demonstrates the potential of manufacturing variable-angle composite cylinders via filament winding (FW), called VAFW. The proposed design strategy allows different filament angles along the axial direction by dividing the cylinder into regions of constant angle called frames. Designs using two, four, or eight frames are herein investigated. A genetic algorithm is applied to optimize each design for maximum axial buckling load. A design with minimum manufacturable filament angle is included in the study. All structures are manufactured and tested under axial compression, with displacements and strains measured by digital image correlation (DIC). The thickness and mid-surface imperfections of the different designs are measured through DIC and used to explain the observed buckling mechanisms. These imperfections are incorporated into a nonlinear numerical model along with a progressive damage analysis. Additionally, a scaling factor is applied on the measured imperfections to enable an imperfection sensitivity study on the proposed designs. The VAFW design shows buckling strength, stiffness, and absorbed energy substantially higher than the constant-angle configuration, attributed to tailored thickness buildup and optimized tow steered angles at particular regions of the cylinder. The experimental and numerical results indicate that VAFW designs can be tailored to postpone buckling so that the material strength can be better exploited.