To Analyze the Effects of Geometric Misalignment in a Cylindrical Pressure Vessel

2012 ◽  
Vol 152-154 ◽  
pp. 964-969 ◽  
Author(s):  
Musharaf Abbas ◽  
Asif Israr ◽  
Atiq Ur Rehman
Keyword(s):  
Finite Element ◽  
Alloy Steel ◽  
Pressure Vessel ◽  
Structural Integrity ◽  
High Strength ◽  
Fe Analysis ◽  
Low Alloy Steel ◽  
Affected Area ◽  
Cylindrical Pressure Vessel ◽  
Geometrical Effects

This particular work consider a pressurized vessel typically made of high strength low alloy steel and containing the geometric misalignment at the cylinder-to-cylinder junction. This misalignment produce in the vessel’s structure is because of girth weld that is evident in most of the fabrication of such type of structures apart from other factors which is beyond the scope of this study. This study evaluates the geometrical effects of mismatch on the structural integrity of the pressure vessel and prediction of stresses at the affected area of the cylinder. Analytical and Finite Element (FE) approaches are employed to analyze the configuration. FE analysis is performed by the use of ANSYS on one quarter of the structure due to symmetry. FE results are also compared with the analytical results of different authors. In addition, maximum allowable mismatch is also determined and is a part of this study.

Effects of Geometric Misalignment Caused by Girth Weld on Fatigue Behavior of a Cylindrical Pressure Vessel

2012 ◽  
Vol 479-481 ◽  
pp. 1066-1069
Author(s):  
Musharaf Abbas ◽  
Rehan Qayyume ◽  
Jamal Hussain Afridi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Pressure Vessel ◽  
Fatigue Behavior ◽  
Fe Analysis ◽  
Element Analysis ◽  
Critical Areas ◽  
Cylindrical Pressure Vessel ◽  
Geometrical Effects

The paper presents the results of finite element analysis of a pressurized vessel typically made of steel 1025 and containing the weld misalignment at the cylinder-to-cylinder junction. This misalignment considered in the vessel’s structure is because of girth weld that is found in most of the fabrications of such type of structures. Geometric misalignment of 50% of thickness is considered for this particular study. The work evaluates the geometrical effects of misalignment on the fatigue behavior of the pressure vessel to quantify its consequences in term of fatigue life and maximum damage. Finite Element (FE) analysis is performed by the use of ANSYS on one quarter of the structure due to symmetry. A significant effect of misalignment on fatigue life of the cylinder has been found and is presented with maximum anticipated damage in the critical areas.

scholarly journals Reduction of Residual Stress for High-Strength Low-Alloy Steel Strip Based on Finite Element Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Zengshuai Qiu ◽  
Anrui He ◽  
Jian Shao ◽  
Xiaoming Xia
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Boundary Conditions ◽  
Alloy Steel ◽  
Steel Strip ◽  
High Strength ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Fe Model ◽  
Low Alloy Steel

Intensive cooling technology is widely utilized in the production of high-strength hot-rolled steel strip. However, intensive cooling at high cooling rate may cause stress heterogeneity on a steel strip, which further generates great residual stress and influences steel strip shape. In this study, a three-dimensional finite element (FE) model of high-strength low-alloy steel strip on the run-out table coupled with heat transfer, phase transformation, and strain/stress is developed by ABAQUS software. To enhance modeling precision, several experiments are conducted, such as uniaxial tensile test at multiple temperatures, dynamic continuous cooling transformation, and scanning electron microscopy, to determine the material properties and boundary conditions of the FE model. Four new models are established based on this model to reduce the residual stress of strip by modifying the initial and boundary conditions. Results show that reducing the initial transverse temperature difference is the most effective in reducing residual stress, followed by sparse cooling, edge masking, and posterior cooling.

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