Toroidal uniformly stressed pressure vessel shell formed by the meridian and ring filament winding

2021 ◽  
Author(s):  
M.A. Komkov
Keyword(s):  
High Pressure ◽  
Cross Section ◽  
Pressure Vessel ◽  
Filament Winding ◽  
Industrial Workers ◽  
Equilibrium Equations ◽  
Emergency Situations ◽  
Breathing Apparatus ◽  
Composite Pressure Vessel ◽  
Toroidal Shells

The paper outlines the prospects for the use of composite toroidal high-pressure cylinders for the breathing apparatus of the Ministry of Emergency Situations, fire brigades, industrial workers, which are more ergonomic in comparison with their cylindrical counterparts. Relying on the analytical solution of the equilibrium equations, we determined the shape of the cross-section of toroidal shells reinforced along the meridians and representing intersecting loop-like curves that form an infinitely long corrugated pipe. The study introduces a solution for a toroidal composite pressure vessel formed by the intersection of the upper and lower branches of the shell, reinforced along the meridians, and a profiled ring layer of filaments installed at the point of their intersection. The parameters of the toroidal uniformly stressed pressure vessel shell made by ring and meridian filament winding are calculated.

scholarly journals Integrated Design of D.D.I., Filament Winding and Curing Processes for Manufacturing the High Pressure Vessel (Type II)

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Hyoseo Kwak ◽  
Gunyoung Park ◽  
Hansaem Seong ◽  
Chul Kim
Keyword(s):  
High Pressure ◽  
Pressure Vessel ◽  
Composite Layer ◽  
Integrated Design ◽  
Filament Winding ◽  
Type Ii ◽  
Curing Process ◽  
Composite Pressure Vessel ◽  
Metal Liner ◽  
Filament Winding Process

Abstract As energy crisis and environment pollution all around the world threaten the widespread use of fossil fuels, compressed natural gas (CNG) vehicles are explored as an alternative to the conventional gasoline powered vehicles. Because of the limited space available for the car, the composite pressure vessel (Type II) has been applied to the CNG vehicles to reach large capacity and weight lightening vehicles. High pressure vessel (Type II) is composed of a composite layer and a metal liner. The metal liner is formed by the deep drawing and ironing (D.D.I.) process, which is a complex process of deep drawing and ironing. The cylinder part is reinforced by composite layer wrapped through the filament winding process and is bonded to the liner by the curing process. In this study, an integrated design method was presented by establishing the techniques for FE analysis of entire processes (D.D.I., filament winding and curing processes) to manufacture the CNG composite pressure vessel (Type II). Dimensions of the dies and the punches of the 1st (cup drawing), 2nd (redrawing-ironing 1-ironing 2) and 3rd (redrawing-ironing) stages were calculated theoretically, and shape of tractrix die to be satisfied with the minimum forming load was suggested for life improvement and manufacturing costs in the D.D.I. process. Thickness of the composite material was determined in the filament winding process, finally, conditions of the curing process (number of heating stage, curing temperature, heating rate and time) were proposed to reinforce adhesive strength between the composite layers.

Multiple Filament Winding for Composite Pressure Vessel

2019 ◽  
Vol 2019 (0) ◽  
pp. J04423
Author(s):  
Nobuhiro YOSHIKAWA ◽  
Kouta HARIYA ◽  
Tadashi UOZUMI ◽  
Masato OKAZAKI
Keyword(s):  
Pressure Vessel ◽  
Filament Winding ◽  
Composite Pressure Vessel

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.

Strategy for Cross-Bores in High Pressure Containers

1969 ◽  
Vol 11 (2) ◽  
pp. 151-161 ◽  
Author(s):  
B. N. Cole
Keyword(s):  
High Pressure ◽  
Fatigue Life ◽  
Cross Section ◽  
Pressure Vessel ◽  
Working Pressure ◽  
Circular Section ◽  
Centre Line ◽  
Cylindrical Pressure Vessel ◽  
Von Mises ◽  
Safe Working

It is frequently necessary to drill a cross-bore through the wall of a cylindrical pressure vessel, and it tends to be taken for granted that the cross-bore—itself of circular section— should lie along a diameter of the main cross-section. The weakening effect of such a hole is well known, and reduces the safe working pressure down to 2/5 of the value for the undisturbed cylinder in the case of a Tresca material, or nearly down to 1/3 in the case of a von Mises material. The paper shows how it is possible to reclaim a large proportion of the ‘lost’ pressure capacity by use of a cross-bore which is either elliptical in section, or, more conveniently, round but offset from a diametral centre-line. Such procedure could thus also greatly improve the fatigue life of the pressure vessel.

scholarly journals Design and Finite Element analysis of Thick walled Laminated Composite Pressure Vessel

2019 ◽  
Vol 8 (10) ◽  
pp. 4389-4394
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pressure Vessel ◽  
Mechanical Performance ◽  
Laminated Composite ◽  
Filament Winding ◽  
Element Analysis ◽  
Specific Strength ◽  
Composite Pressure Vessel ◽  
Glass Fibre Reinforced

Composite materials in general offer a high potential for manufacturing of structures with featuring an interesting mechanical performance, mainly with regards to specific stiffness, specific strength, damage tolerance and energy absorption capability. In current analysis, glass fibre reinforced in epoxy resin to form a laminated composite walled pressure vessel(filament winding) is considered for design. The purpose of this work is primarily to perform finite element analysis (FEA) of a composite walled pressure vessel (CPV) under different loads. Different design stresses and strains are evaluated using Lame’s equation. These outcomes are tabulated and examined with the results of the steel walled pressure vessel used for LPG. It is foundthat CPV is a suitable vessel for LPG storage and it can be replaced current LPG steel walled vessel to CPV.

scholarly journals Burst strength analysis of composite overwrapped pressure vessel using finite element method

2021 ◽  
Vol 1201 (1) ◽  
pp. 012029
Author(s):  
Y Regassa ◽  
H G Lemu ◽  
B Sirhabizu
Keyword(s):  
Finite Element ◽  
Pressure Vessel ◽  
Numerical Study ◽  
Axial Direction ◽  
Filament Winding ◽  
Strength Analysis ◽  
Effect Analysis ◽  
Composite Pressure Vessel ◽  
Research Findings ◽  
Burst Performance

Abstract The purpose of this numerical study was to investigate the burst performance of a type III composite overwrapped pressure vessel (COPV) using finite element methods. An Aluminum overwrapped composites pressure vessel was modeled from four layers of carbon fiber/epoxy ply with 0.762 mm and arranged in two different sequences and orientations. The overwrap composite pressure vessel burst performance was examined by applying an internal pressure of 55 MPa on a ply arrangement of [-15°/0°/+15°/90°] and other research findings on [+55°/-55°] as an optimum filament winding angle were used for comparison purpose. Moreover a ply level orientation effect analysis, which is a superior feature of ABAQUS, was used for the composite modelling. The designed ply sequence and orientation exhibit a higher burst pressure at [0°] ply and minimum at [90°] ply orientation. The vertical COPV design displays a maximum stress along the axial direction that leads to the consideration of maximum vessel thickness to be along axial direction for burst resistant design of COPV.

Formation of defects in implanted hipox-structures

1992 ◽  
Vol 50 (2) ◽  
pp. 1406-1407
Author(s):  
Peter Pegler ◽  
N. David Theodore ◽  
Ming Pan
Keyword(s):  
High Pressure ◽  
Cross Section ◽  
Semiconductor Devices ◽  
Silicon Substrates ◽  
Processing Conditions ◽  
Pressure Oxidation ◽  
Deep Trench ◽  
Local Oxidation ◽  
Trench Isolation ◽  
And Behavior

High-pressure oxidation of silicon (HIPOX) is one of various techniques used for electrical-isolation of semiconductor-devices on silicon substrates. Other techniques have included local-oxidation of silicon (LOCOS), poly-buffered LOCOS, deep-trench isolation and separation of silicon by implanted oxygen (SIMOX). Reliable use of HIPOX for device-isolation requires an understanding of the behavior of the materials and structures being used and their interactions under different processing conditions. The effect of HIPOX-related stresses in the structures is of interest because structuraldefects, if formed, could electrically degrade devices.This investigation was performed to study the origin and behavior of defects in recessed HIPOX (RHIPOX) structures. The structures were exposed to a boron implant. Samples consisted of (i) RHlPOX'ed strip exposed to a boron implant, (ii) recessed strip prior to HIPOX, but exposed to a boron implant, (iii) test-pad prior to HIPOX, (iv) HIPOX'ed region away from R-HIPOX edge. Cross-section TEM specimens were prepared in the <110> substrate-geometry.

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