Structural Deformations Analysis of Carbon Filament-Wound Composite Pressure Vessels under Internal Pressure

2011 ◽  
Vol 217-218 ◽  
pp. 125-130
Author(s):  
Xi Tao Zheng ◽  
Xian Yin Fan ◽  
Tian Jiao Qu ◽  
Lin Hu Gou ◽  
Yong Cheng
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Element Model ◽  
Pressure Vessels ◽  
Structural Deformation ◽  
Carbon Filament ◽  
Geometric Conditions ◽  
Filament Wound ◽  
Filament Wound Composite

Filament-wound composites are more and more frequently used for pressure tanks and motor cases. It is essential to study their mechanical properties, especially the properties at peculiar shaped locations. A carbon fiber wound pressure vessel structure was chosen to investigate by experiment and finite element method in our program, respectively. Considering the vessel deformation, internal pressure load was added step by step so that the changing stiffness matrix and changing geometric conditions could be calculated in simulation process. In our experiment, the pressure vessel with strain gauges was tested under internal pressure to get strain data at some typical locations. And a finite element model was built with software ANSYS considering the structural deformation of the pressure vessel. Under internal pressure, it is found that fibers in the cylinder part of the vessel are in tension and fibers in partial dome region are bent and transversely compressed. The simulated results also are in good agreement with experimental results.

The Effects of Layer-by-Layer Thickness and Fiber Volume Fraction Variation on the Mechanical Performance of a Pressure Vessel

2018 ◽  
Author(s):  
Emre Özaslan ◽  
Ali Yetgin ◽  
Volkan Coşkun ◽  
Bülent Acar ◽  
Tarık Olğar
Keyword(s):  
Finite Element ◽  
Layer Thickness ◽  
Pressure Vessel ◽  
Fiber Volume Fraction ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Element Model ◽  
Layer By Layer ◽  
Fiber Volume ◽  
Filament Wound

Due to high stiffness/weight ratio, composite materials are widely used in aerospace applications such as motor case of rockets which can be regarded as a pressure vessel. The most commonly used method to manufacture the pressure vessels is the wet filament winding. However, the mechanical performance of a filament wound pressure vessel directly depends on the manufacturing process, manufacturing site environmental condition and material properties of matrix and fiber. The designed ideal pressure vessel may not be manufactured because of the mentioned issues. Therefore, manufacturing of filament wound composite structures are based on manufacturing experience and experiment. In this study, the effect of layer-by-layer thickness and fiber volume fraction variation due to manufacturing process on the mechanical performance was investigated for filament wound pressure vessel with unequal dome openings. First, the finite element model was created for designed thickness dimensions and constant material properties for all layers. Then, the model was updated. The updated finite element model considered the layer-by-layer thickness and fiber volume fraction variation. Effects of the thickness and fiber volume fraction on the stress distribution along the motor axial direction were shown. Also hydrostatic pressurization test was performed to verify finite element analysis in terms of fiber direction strain through the motor case outer surface. Important aspects of analyzing a filament wound pressure vessel were addressed for designers.

The Effects of Layer-by-Layer Thickness and Fiber Volume Fraction Variation on the Mechanical Performance of a Pressure Vessel

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Emre Özaslan ◽  
Ali Yetgin ◽  
Bülent Acar ◽  
Volkan Coşkun ◽  
Tarık Olğar
Keyword(s):  
Finite Element ◽  
Pressure Vessel ◽  
Material Properties ◽  
Fiber Volume Fraction ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Element Model ◽  
Layer By Layer ◽  
Fiber Volume ◽  
Filament Wound

Abstract Due to high stiffness/weight ratio, composite materials are widely used in aerospace applications such as motor case of rockets which can be regarded as a pressure vessel. The most commonly used method to manufacture pressure vessels is the wet filament winding. However, the mechanical performance of a filament wound pressure vessel directly depends on the manufacturing process, manufacturing site environmental condition, and material properties of matrix and fiber. The designed pressure vessel may not be manufactured because of the mentioned issues. Therefore, manufacturing of filament wound composite structures are based on manufacturing experience and experiment. In this study, effects of layer-by-layer thickness and fiber volume fraction variation due to manufacturing process on the mechanical performance were investigated for filament wound pressure vessel with unequal dome openings. First, the finite element model was created for designed thickness dimensions and constant material properties for all layers. Then, the model was updated. The updated finite element model considered the thickness of each layer separately and variation of fiber volume fraction between the layers. Effects of the thickness and fiber volume fraction on the stress distribution along the motor axial direction were shown. Also hydrostatic pressurization tests were performed to verify finite element analysis in terms of fiber direction strain through the motor case outer surface. Important aspects of analyzing a filament wound pressure vessel were addressed for designers.

Study on the Stress Concentration at the Round Corners of Flat Heads in Pressure Vessels Subjected to Internal Pressure

1996 ◽  
Vol 118 (4) ◽  
pp. 429-433
Author(s):  
H. Chen ◽  
J. Jin ◽  
J. Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Intensity ◽  
Stress Concentration ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Stress Index ◽  
Element Analysis ◽  
Approximate Formulas

Results from finite element analysis were used to show that the stress index kσ and the nondimensionalized highly stressed hub length kh of a flat head with a round corner in a pressure vessel subjected to internal pressure are functions of three dimensionless parameters: λ ≡ h/dt, η ≡ t/d, and ρ ≡ r/t. Approximate formulas for estimating kσ and kh from λ, η, and ρ p are given. The formulas can be used for determining a suitable fillet radius for a flat head in order to reduce the fabricating cost and to keep the stress intensity at the fillet under an acceptable limit.

Elastic-Plastic Stress Analysis of Pressure Vessels

2012 ◽  
Author(s):  
Yang-chun Deng ◽  
Gang Chen
Keyword(s):  
Internal Pressure ◽  
Stress Analysis ◽  
Strain Hardening ◽  
Pressure Vessel ◽  
Plastic Instability ◽  
Pressure Vessels ◽  
Structural Deformation ◽  
Elastic Plastic ◽  
Thin Walled ◽  
Plastic Stress

To save material, the safety factor of pressure vessel design standards is gradually decreased from 5.0 to 2.4 in ASME Boiler and Pressure Vessel Codes. So the design methods of pressure vessel should be more rationalized. Considering effects of material strain hardening and non-linear structural deformation, the elastic-plastic stress analysis is the most suitable for pressure vessels design at present. This paper is based on elastic-plastic theory and considers material strain hardening and structural deformation effects. Elastic-plastic stress analyses of pressure vessels are summarized. Firstly, expressions of load and structural deformation relationship were introduced for thin-walled cylindrical and spherical vessels under internal pressure. Secondly, the plastic instability for thin-walled cylindrical and spherical vessels under internal pressure were analysed. Thirdly, to prevent pressure vessels from local failure, the ductile fracture strain of materials was discussed.

Buckling Behaviour of Circular Ring Stiffened Filament Wound Composite Pressure Hull through Finite Element Analysis

2014 ◽  
Vol 656 ◽  
pp. 288-297
Author(s):  
Krishna Murari Pandey ◽  
Abhijit Dey ◽  
P.L. Choudhury
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pressure Vessel ◽  
Failure Modes ◽  
Element Analysis ◽  
Finite Element Software ◽  
Filament Wound ◽  
Composite Pressure Vessel ◽  
Filament Wound Composite ◽  
Wound Composite

The aim of present study was investigate the buckling pressure of moderately thick-walled filament-wound carbon–epoxy stiffened composite pressure vessel subjected to external hydrostatic pressure through finite element analysis and compare the result with un-stiffened filament wound carbon/epoxy composite pressure vessel used in under water vehicle applications. The winding angles were [±30/90] FW, [±45/90] FW and [±60/90] FW. ANSYS 14.0 APDL, a commercial finite element software package successfully predicted the buckling pressure of filament-wound composite pressure vessel with a deviation much higher than the results of un-stiffened filament wound composite cylinder .All the finite element analysis shows that the composite pressure vessel with winding pattern [±60/90] FW has the higher value of critical buckling pressure. Major failure modes in both the analysis were dominated by the helical winding angles.

Dome shape optimization of filament-wound composite pressure vessels based on hyperelliptic functions considering both geodesic and non-geodesic winding patterns

2016 ◽  
Vol 51 (14) ◽  
pp. 1961-1969 ◽  
Author(s):  
Ji Zhou ◽  
Jianqiao Chen ◽  
Yaochen Zheng ◽  
Zhu Wang ◽  
Qunli An
Keyword(s):  
Optimum Design ◽  
Basis Function ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Filament Wound ◽  
Composite Pressure Vessel ◽  
Filament Wound Composite ◽  
Winding Angle ◽  
Dome Shape ◽  
Wound Composite

Filament-wound composite pressure vessels, owing to the advantages of their high specific strength, specific modulus and fatigue resistance, as well as excellent design performance, have been widely used in energy engineering, chemical industry and other fields. A filament-wound composite pressure vessel generally consists of two parts, a cylindrical drum part and the dome parts. In the cylindrical drum part, the filament winding angle and the winding layer thickness can be easily determined due to the regular shape. In the dome parts, however, both the winding angle and the thickness vary along the meridian line. Performance of the dome parts, which strongly depends on the effect of end-opening and the winding mode, dominates the performance of a pressure vessel. In this paper, optimum design of the dome parts is studied by considering both geodesic winding and non-geodesic winding patterns. A hyperelliptic function is adopted as the basis function for describing the meridian of the dome shape. The dome contour is optimized by taking the shape factor (S.F.) as the objective and parameters in the basis function as the design variables. A specific composite pressure vessel is taken as the numerical analysis example with varying dome shape which is to be optimized. The optimum design solution is obtained through the particle swarm optimization algorithm. It shows that an optimized dome with non-geodesic winding has better S.F. as compared with geodesic winding. Influences of the slippage coefficient and the polar opening on the S.F. are also discussed.

Design and Analysis Techniques for Filament-Wound Composite Pressure Vessel Domes

1999 ◽  
Author(s):  
William E. Howard ◽  
G. E. O. Widera
Keyword(s):  
Pressure Vessel ◽  
Pressure Vessels ◽  
Filament Winding ◽  
New Markets ◽  
Analysis Techniques ◽  
Filament Wound ◽  
Composite Pressure Vessel ◽  
Filament Wound Composite ◽  
Wound Composite ◽  
Composite Pressure Vessels

Abstract The use of filament-wound composite pressure vessels has expanded into many new markets in recent years, creating the need for better design and analysis techniques, particularly for the end domes. In this paper, design and analysis techniques are developed for elliptical-conical dome profiles with planar filament winding patterns. The effects of wide winding bandwidth are included by dividing the band into sub-bands and considering any point on the dome contour to be a laminate made up of the sub-bands. The slippage tendency of the band at its edges is also calculated.

A Finite Element Model to Analyze Cylinder-Cylinder Intersections

1987 ◽  
Vol 109 (4) ◽  
pp. 411-420 ◽  
Author(s):  
R. Natarajan ◽  
G. E. O. Widera ◽  
P. Afshari
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Shell Theory ◽  
Element Model ◽  
Pressure Loading

A finite element model is proposed to study the stresses in the neighborhood of a cylinder-cylinder intersection. In particular, diameter ratios greater than 0.5 are focused upon since little information is available in the ASME Boiler and Pressure Vessel Code or in the literature about the stress concentration for these geometries. The aim of the present work is to validate such a model for internal pressure loading. To accomplish this, various parametric finite element studies were conducted. The selected model is then validated by applying it to various available cylinder intersection models and comparing the results. The finite element results are further compared with a solution obtained using a shell theory.

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