Stress distribution optimization in dished ends of cylindrical pressure vessels

2022 ◽  
Vol 171 ◽  
pp. 108808
Author(s):  
Krzysztof Sowiński
Keyword(s):  
Stress Distribution ◽  
Pressure Vessels

Stress distribution in continuously heterogeneous thick laminated pressure vessels

2001 ◽  
Vol 54 (2-3) ◽  
pp. 371-377 ◽  
Author(s):  
Viktor E. Verijenko ◽  
Sarp Adali ◽  
Pavel Y. Tabakov
Keyword(s):  
Stress Distribution ◽  
Pressure Vessels

Residual Stress Assessment for Pressure Vessel Subject to Thermal Shock

2017 ◽  
Author(s):  
Jushin Hsiao ◽  
Haiyang Qian ◽  
Christopher Brunner ◽  
Thomas R. Bober ◽  
Lynn D’Amico ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Pressure Vessels ◽  
Residual Stress Distribution ◽  
Life Assessment ◽  
Systematic Analysis ◽  
Maximum Residual Stress ◽  
Film Coefficient ◽  
Assessment Procedures ◽  
Thermal Shocks

API 579-1/ASME FFS-1 Part 9 provides assessment procedures for evaluating crack-like flaws in components to determine if it is fit for continued service. Although residual stress distribution is required as an input to perform a fatigue life assessment, no procedure or guideline is available for evaluating this crack driving force resulting from thermal shocks. Through a systematic analysis, a conservative residual stress distribution can be obtained for pressure vessels subject to thermal shocks. For the two thick-walled vessels considered, the maximum residual stress occurs when the vessel is half filled with water. The conservative residual stress provides the needed input when using API 579-1/ASME FFS-1 for evaluating crack-like flaws in components. Dependence of the residual stress on film coefficient, temperature difference between water and metal surface, and water level inside the vessel is also presented so that refinement can be made on life assessment when additional field data becomes available.

Contact Between Vessel Shell and Welded Pad in Nozzle Reinforcement

1993 ◽  
Vol 115 (4) ◽  
pp. 364-372 ◽  
Author(s):  
H. Chen ◽  
Y.-J. Chao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Contact Force ◽  
Thin Shell ◽  
Pressure Vessels ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Shell Analysis

In the thin shell analysis of welded pad reinforced nozzles in pressure vessels, no contact between pad and vessel is often assumed. The significance of this contact force to the stress distribution in the structure is little known. In this paper, stress results from the finite element analysis, which includes the contact force between the pad and the vessel, are reported. A comparison of the finite element results with those from thin shell analysis and experiments shows that the finite element method with contact assumption yields improved theoretical prediction for the stress distribution. The effect of both the gap and friction between the pad and the vessel are also investigated.

Simulation and Stress Analysis of U-Shaped Seam Welding Process Based on ABAQUS

2014 ◽  
Vol 900 ◽  
pp. 612-616
Author(s):  
Hong Zhi Zhang ◽  
Xuan Yu Sheng
Keyword(s):  
Stress Distribution ◽  
Large Scale ◽  
Welding Process ◽  
Pressure Vessels ◽  
Energy Curve ◽  
Welding Temperature ◽  
Seam Welding ◽  
Material Part ◽  
Tower Equipment ◽  
Abaqus Software

At present, there is large-scale trend for chemical containers and reaction tower in the industry. In the large-scale equipment, U-shaped weld structure are widely used for splice weld of container wall. In this paper, by ABAQUS software, using plane models, U-shaped seam welding process was simulated which was commonly used in pressure vessels and tower equipment. For welding material part, the calculation use of "dead-actived elements" technique, and the weld material part was divided into finer grid. The calculation model of the plane model was created using CATIA software, the software plug-in software was used to transform the model to directly read the ABAQUS software model. Calculation can be given to each welding temperature distribution and stress distribution. At the same time, the welding process to consider the cooling after welding. Computer simulation gave the overall structure of the stress distribution and strain energy curve.

Comparative Study for Stresses in Nozzle and Flange Welds Generated During Conventional Pressure Testing and Local Pressure Testing Using Bolted Devices

2005 ◽  
Author(s):  
Ayman M. Cheta ◽  
Richard Brodzinski
Keyword(s):  
Stress Distribution ◽  
Comparative Study ◽  
Pressure Vessels ◽  
Local Pressure ◽  
Pressure Testing ◽  
Advantages And Disadvantages ◽  
Repair Costs ◽  
Pressure Test ◽  
The Cost

Weld repairs and alterations of pressure vessels and piping built to ASME codes may require pressure testing to prove the integrity of the weld and/or design. In recent years, several designs were developed to employ bolted devices when performing local pressure testing of flange-to-nozzle, flange-to-pipe and nozzle-to-shell attachment welds. Due to the cost and equipment down time associated with performing a full conventional pressure test and the desire to reduce repair costs, several petrochemical companies adopted the use of such devices. The purpose of this paper is to compare the stress values and stress distribution associated with both techniques. The advantages and disadvantages of both approaches are discussed and the conclusions are supported by a practical example.

Shakedown and Fatigue Evaluations of Overlay Cladding on Reactor Pressure Vessels

2011 ◽  
Author(s):  
Seiji Asada ◽  
Harutaka Suzuki ◽  
Toshiya Saruwatari
Keyword(s):  
Stress Distribution ◽  
Base Metal ◽  
Design Methodology ◽  
Evaluation Method ◽  
Pressure Vessels ◽  
Stress Evaluation ◽  
Alternative Design ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Reactor Pressure

Overlay cladding is classified to non-pressure boundary. Not only the ASME Boiler & Pressure Vessels Code Section III [1] but also the JSME Design and Construction Code [2] prescribe that no structural strength shall be attributed to cladding and the presence of the cladding shall be considered with respect to both the thermal analysis and the stress analysis. This means the codes do not require stress evaluation for overlay cladding itself. If overlay cladding has a fatigue crack, the crack may grow and extend to the base metal. Thus overlay cladding may give an influence on the integrity of base metal in the pressure boundary. The thermal expansion of stainless steel cladding is different from that of base metal made of low alloy steel, and this difference causes discontinuity of stress distribution between the cladding and the base metal. It is questionable that a stress evaluation line is set on such stress distribution including discontinuity between the cladding and the base metal. An evaluation method based on elastic-plastic analysis is preferable to evaluate such portion. ASME B&PV Sec.III and Sec.VIII, Div. 2 [3] have plastic analysis provisions. Also the JSME D&C Code issued a code case on alternative design methodology by using elastic-plastic finite element analysis for Class 1 vessels [4, 5]. In this paper, shakedown, fatigue and environmental fatigue evaluations are performed for the overlay cladding of direct vessel injection nozzle of Reactor Pressure Vessel by using the JSME Code Case on the alternative design methodology.

scholarly journals Numerical Analysis of Filament Wound Cylindrical Composite Pressure Vessels Accounting for Variable Dome Contour

2021 ◽  
Vol 5 (2) ◽  
pp. 56
Author(s):  
Kumar C. Jois ◽  
Marcus Welsh ◽  
Thomas Gries ◽  
Johannes Sackmann
Keyword(s):  
Stress Distribution ◽  
Pressure Vessel ◽  
Single Layer ◽  
Pressure Vessels ◽  
Filament Wound ◽  
Cylindrical Pressure Vessel ◽  
Composite Pressure Vessel ◽  
Polymer Liner ◽  
Specific Distance ◽  
Composite Pressure Vessels

In this work, the stress distribution along cylindrical composite pressure vessels with different dome geometries is investigated. The dome contours are generated through an integral method based on shell stresses. Here, the influence of each dome contour on the stress distribution at the interface of the dome-cylinder is evaluated. At first, the integral formulation for dome curve generation is presented and solved for the different dome contours. An analytical approach for the calculation of the secondary stresses in a cylindrical pressure vessel is introduced. For the analysis, three different cases were investigated: (i) a polymer liner; (ii) a single layer of carbon-epoxy composite wrapped on a polymer liner; and (iii) multilayer carbon-epoxy pressure vessel. Accounting for nonlinear geometry is seen to have an effect on the stress distribution on the pressure vessel, also on the isotropic liner. Significant secondary stresses were observed at the dome-cylinder interface and they reach a maximum at a specific distance from the interface. A discussion on the trend in these stresses is presented. The numerical results are compared with the experimental results of the multilayer pressure vessel. It is observed that the secondary stresses present in the vicinity of the dome-cylinder interface has a significant effect on the failure mechanism, especially for thick walled cylindrical composite pressure vessel. It is critical that these secondary stresses are directly accounted for in the initial design phase.

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