Analytical modeling and numerical analysis of the effect of mosaic patterns on composite pressure vessels with dome

2021 ◽  
pp. 073168442199432
Author(s):  
Muhammad Kaleem Akhtar ◽  
Waqar Ahmad Qureshi ◽  
Rehan Jamshed ◽  
Mohsin Raza
Keyword(s):  
Numerical Analysis ◽  
Analytical Modeling ◽  
Pressure Vessels ◽  
Analytical Tool ◽  
Analysis Tool ◽  
Element Analysis ◽  
Realistic Modeling ◽  
Helical Angle ◽  
Cubic Spline Function ◽  
Composite Pressure Vessels

The aim of this work is to provide an analytical tool and numerical analysis for the optimum design of composite pressure vessels with the dome, incorporating triangular mosaic patterns. This article presents the analytical modeling involving kinematic constraints based on geodesic trajectory: the helical angle and dome thickness. The structural analysis is performed using a commercial finite element analysis tool. The results show that this new analytical method gives more accurate dome thickness than cubic spline function and Gramoll and Namiki’s methods. The incorporation of mosaic patterns based on winding kinematics provides more realistic modeling of the real stress distribution and the stress values compared to the vessel without mosaic patterns and vessels with mosaic patterns based on nongeodesic trajectories. The results have been validated and are quite promising with regard to better accuracy and safety.

Simplified Thermo-Elasto-Plastic Analysis Models for Determination of Global and Local Stresses in Coke Drums

2013 ◽  
Author(s):  
Yanxiang Zhang ◽  
Zihui Xia
Keyword(s):  
Shell Element ◽  
Pressure Vessels ◽  
Analytical Models ◽  
Analysis Tool ◽  
Uniform Temperature ◽  
Element Analysis ◽  
Local Stresses ◽  
Petroleum Refineries ◽  
Analysis Models ◽  
Global And Local

Coke drums are major pressure vessels used in petroleum refineries. In this paper, two simplified analytical models based on thermo-elasto-plastic constitutive theory have been developed to evaluate global and local stresses in coke drums during their operation cycles. The first model considers the temperature and internal pressure cycle experienced by a drum shell element consisting of clad and base steels. The second model is an axisymmetric circular cladding plate model experiencing a non-uniform temperature distribution history. The latter model considers the effects of severe local non-uniform temperature distributions produced by the hot/cold spots appearing randomly in coke drums during the water quenching stage. The predicted results by the simplified models are in agreement with the results obtained from much complicated and time-consuming finite element analysis (FEA) models for the coke drums. Corresponding software packages for application of the two simplified analysis models (SAM) have also been developed. The developed SAM and software could be a more convenient analysis tool for coke drum designers and engineers in comparison to the use of FEA software package.

Fibre Reinforced Composite Pressure Vessel Heads Subject to External Pressure

2017 ◽  
Author(s):  
Martin Muscat ◽  
Duncan Camilleri ◽  
Brian Ellul
Keyword(s):  
Pressure Vessel ◽  
Weight Ratio ◽  
External Pressure ◽  
Pressure Vessels ◽  
Design Codes ◽  
Element Analysis ◽  
Inelastic Analysis ◽  
Reinforced Composite ◽  
Composite Pressure Vessel ◽  
Composite Pressure Vessels

The increase in stiffness to weight ratio and relative ease of manufacturing fibre reinforced composite pressure vessels, have put such vessels at the forefront of technology. However only limited research and specific codes pertaining exclusively to composite pressure vessel design can be found in literature. The ASME Boiler and Pressure Vessel (BPVC) Section X Code and the European design codes EN 13121-3:2016 (GRP tanks and vessels for use above ground) together with EN 13923:2005 (Filament wound FRP pressure vessels — materials, design, manufacturing and testing) are some of the few known design codes applicable to composite pressure vessels. These codes utilise both design by rule (DBR) and design by analysis (DBA) methods. The authors believe that more studies along the DBA route would benefit the composite pressure vessel design community and make it more accessible to designers and engineers. A similar scenario has already been seen in the last 10 to 15 years for steel pressure vessel design codes when DBA based on inelastic analysis was introduced. In line with these thoughts, this study compares the different design methods to prevent buckling and applies finite element analysis (FEA) to analyse a hemispherical GFRP pressure vessel head subjected to external pressure. The effect of material damage and geometrical imperfections on the final collapse failure is examined and discussed.

Life Prediction of Composite Pressure Vessels Using Multi-Scale Approach

2010 ◽  
Author(s):  
Sung Kyu Ha ◽  
Stephen W. Tsai ◽  
Seong Jong Kim ◽  
Khazar Hayat ◽  
Kyo Kook Jin
Keyword(s):  
Fatigue Life ◽  
Stress Analysis ◽  
Pressure Vessel ◽  
Composite Structures ◽  
Life Prediction ◽  
Pressure Vessels ◽  
Multi Scale ◽  
Helical Angle ◽  
Composite Pressure Vessel ◽  
Composite Pressure Vessels

A multi-scale fatigue life prediction methodology of composite pressure vessels subjected to multi-axial loading has been proposed in this paper. The multi-scale approach starts from the constituents, fiber, matrix and interface, leading to predict behavior of ply, laminates and eventually the composite structures. The life prediction methodology is composed of two steps: macro stress analysis and micro mechanics of failure based on fatigue analysis. In the macro stress analysis, multiaxial fatigue loading acting at laminate is determined from finite element analysis (FEM) of composite pressure vessel, and ply stresses are computed using a classical laminate theory (CLT). The micro-scale stresses are calculated in each constituent (i.e. matrix, interface, and fiber) from ply stresses using a micromechanical model. Micromechanics of failure (MMF) was originally developed to predict the strength of composites and now extended to prediction of fatigue life. Two methods are employed in predicting fatigue life of each constituent, i.e. an equivalent stress method for multi-axially loaded matrix, and a critical plane method for the interface. A modified Goodman diagram is used to take into account the generic mean stresses. Damages from each loading cycle are accumulated using Miner’s rule. Each fiber is assumed to follow a probabilistic failure depending on the length. Using the overall micro and macro models established in this study, Monte Carlo simulation has been performed to predict the overall fatigue life of a composite pressure vessel considering statistical distribution of material properties of each constituent and manufacturing winding helical angle.

Integrated Structural Analysis of Composite Pressure Vessels: A Design Tool

2016 ◽  
Author(s):  
Jörg B. Multhoff
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pressure Vessels ◽  
Design Tool ◽  
Filament Winding ◽  
Element Analysis ◽  
Efficient Manner ◽  
Complex Deformation ◽  
Deformation And Failure ◽  
Composite Pressure Vessels

The growing interest in gas storage for mobile applications leads to a rising demand for light-weight composite pressure vessels. These are comprised of multiple interacting parts: composite overwrap, liner and boss. The composite overwrap is a multi-layered structure with anisotropic properties that exhibits complex deformation and failure characteristics. The behavior of this structure is unintuitive and can only be understood using thorough analysis. A variety of analysis techniques, ranging from simple netting analysis to detailed finite element analysis, are available. Finite element analysis is applied less often than may be expected due to the high effort for modeling, data preparation and result interpretation. Frequently, manufacturers rely on trial and error approaches to solve the design challenge. Analysis is only used as required to verify the final design. This may result in suboptimal designs. Based on ten years of experience in design and analysis of composite pressure vessels, a tool chain is presented that integrates filament winding simulation and finite element analysis in an automated and efficient manner. This facilitates the understanding of the complex behavior of composite pressure vessels and drives an iterative design-by-analysis process.

Comparative Study for the Design of Optimal Composite Pressure Vessels

2010 ◽  
Vol 442 ◽  
pp. 381-388 ◽  
Author(s):  
A.M. Butt ◽  
Syed Waheed-ul-Haq
Keyword(s):  
Optimal Design ◽  
Design Method ◽  
Transversely Isotropic ◽  
Pressure Vessels ◽  
Filament Winding ◽  
Stress Profile ◽  
Element Analysis ◽  
Optimal Design Method ◽  
Internal Volume ◽  
Composite Pressure Vessels

Composite pressure vessels require special design attention to the dome region because of the varying wind angles generated using the filament winding process. Geometric variations in the dome region cause the fiber to change angels and thickness and hence offer difficulty to acquire a constant stress profile (isotensoid). Therefore a dome contour which allows an isotensoid behavior is the required structure. Two design methods to generate dome profiles for similar dome openings were investigated namely Netting Analysis and Optimal Design method. Both methods assume that loads are carried by the fiber alone (monotropic) ignoring the complete composite behavior. Former method produced a lower dome internal volume and a higher fiber thickness as compared to the later optimal design method when studied against different normalized dome opening radiuses. The optimal dome contour was studied in ANSYS with a trial design. The dome was considered to have transversely isotropic property with a dome contour based on monotropic model. While investigating the dome with non linear large displacement finite element analysis, the dome still exhibited isotensoid behavior with transverse isotropic material assignment. Elliptic integrals were used to generate the optimal dome contours and hence elliptic dome contours were formed which were isotensoid in nature with complete composite representation.

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