Strength of Welded Pipe-plate Joints (original) (raw)
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Journal of engineering & processing management, 2021
The defects in pipe elbows can, depending on their size and position, affect the integrity and safe service, as well as deformation ability of the piping systems in exploitation. Incompletely filled groove, which is the type of defect examined here, was observed by ultrasonic measurement on the pipeline in the regulation system of the hydro power plant Djerdap. Three-dimensional finite element analysis is performed using Simulia Abaqus software package. First, the models with dimensions of the defects observed by non-destructive examination are formed. Stress and strain fields for different loading types are shown and commented. The influence of the defect dimensions on the pipe elbow load-carrying capacity is determined through plastic collapse loads, which are obtained from bending moment-rotation angle diagrams. Twice elastic slope (TES) technique is applied. Additionally, some more severe defects are considered, in the form of sharp pre-cracks at the bottom of the defect; plastic collapse loads are also determined for these geometries. Both opening and closing bending moments are taken into consideration and the results are discussed and compared to two closed-form solutions from the literature. The influence of the boundary conditions applied for examination of the pipe elbows is commented.
Experimental and Numerical Study of Mechanical Behavior of Welded Steel Plate Joints
Metals, 2020
This paper describes a study of welded steel plate joints using experimental and numerical methods. The objectives of this study are to observe the mechanical behavior of welded plate joints under monotonic and cyclic loads, identify their damage degradation processes, and provide useful test data for future damage analysis of beam-column connections in steel frame structures. Six specimens were designed, of which three were tested under monotonic loads, and the other three were tested under cyclic loads. The test setup consisted of three plates arranged in a cruciform and connected by two groove welds. The monotonic and cyclic loads were applied to the free end of the two outstanding plates, inducing a pulling force on the welded joint. Because the only element studied in the present work is the weld, the sizes of the three plates were kept constant. The responses of these welded plate joints are discussed in terms of their experimentally and numerically obtained mechanical parameters, hysteretic behavior, strain variations, stiffness degradation, damage process, and failure modes. The results show that the energy damage model outperforms the displacement damage model in terms of indicating the degree of damage. Furthermore, if designed according to code, all these welded plate joints perform satisfactorily.
Investigation of Welded Joints in Finite Element Analysis
ICONSAD, 2022
Regions with the lowest fatigue life in a welded joint are usually formed at the weld toe or weld root. It is important to carefully examine the welded joint region, especially for structures exposed to high moments and forces. While evaluating welded joints in finite element method (FEM) analysis, it can be evaluated according to International Institute of Welding (IIW). According to IIW, there are four approaches to evaluate the stresses on the welded joint: the nominal stress approach, the structural hot spot stress approach, the effective notch stress approach and the linear elastic fracture mechanics' approach. In large and complex structures, modeling of welded joints in FEM analyzes affects the time spent for analysis. Therefore, preferred approach for modeling and evaluation is important for the time spent. The accuracy rate, on the other hand, varies according to the chosen approach, and investigations should be made according to the complexity of the structure being analyzed and the type of stress coming to the examined region. Although the accuracy rate is closest to the linear elastic fracture approach, this approach is not preferred because it will require a lot of effort in FEM analysis, especially in complex structures. In this study, conventional approaches proposed by IIW were examined while performing welded joints in FEM analysis. These investigations were carried out in the welded region with the most critical stress on a mobile crane machine. According to the results of the study, the hot spot stress was found to be 693 MPa and the nominal stress was 515 MPa according to the maximum principal stress in this region.
Experimental and Fe Analysis of Eccentric Loaded Welded Joint Structure
Arc welded structures are widely used in automobiles, constructions & power plants. As the main cause of weldment failure is design defect & overload, hence it is necessary to analyze the maximum stresses in the weldment. In this project experimentation is carried out on symmetrical and unsymmetrical eccentric loaded welded joint to determine the breaking stress in the weldment. The FE analysis & analytical estimation of breaking stress is also carried out to verify the experimental results. The stress distribution along weld size & throat thickness is evaluated and also compared with reported findings under same loading condition. Further eccentric loaded welded joint is analyzed under eccentric load by varying the gap between parent plates.
Strength of welded joints under combined shear and out-of-plane bending
Canadian Journal of Civil Engineering, 2010
An experimental and analytical research program was conducted with the objective of investigating the response of welded joints loaded under combined out-of-plane bending and shear. A database of test results, including 60 tests from the University of California in Davis, eight tests from an early research program at the University of Alberta in Edmonton, and 24 tests from Université Laval in Ste.-Foy, was used to evaluate several strength prediction models and the current North American design approaches. This work was complemented by a reliability analysis to assess the level of safety provided by these design approaches. It was determined that both the Canadian Institute of Steel Construction (CISC) and the American Institute of Steel Construction (AISC) approaches provide remarkably conservative predictions of the test results, especially for cases where the welded plate thickness is large. Although a modified version of an approach proposed by earlier investigators in 1972 and ...
Bending Stresses Calculation in Welded Joint
This particular paper would be dealing with the analysis of the cantilever beam box that would be focusing on fluctuating torsional or statics moment loading. Those types of beams might be having many locations that could be critical from the view's strong point; among the interesting information is that, the cross-section where loading would be imposed. Although such information could be designed typically so that they could be possessing smooth shapes, and it would result in concentrations that could be moderating stress, that would be meaning that the fatigue failures could be avoided. Although, the cross section's distortional deformation and it would be inducing transverse bending stress, which might be detrimental, mainly in welded beam box. Moreover, the fixed location where the beam would be typically welded in the endplate might have become an essential point. This particular paper would be presenting an approach that would be analytical for the calculation of longitudinal stresses because of the cross-section's warping with the longitudinal stresses and distortion-induced transverse in the sections of the rectangular hollow. FEAs would be carried out so that an analytical approach could be verified and shedding light on vital points in the details of the plates with weld penetration's different levels. By the use of ENS the idea and suggesting design proposals for the structural detail that could be efficient of plates diaphragm in decreasing the behavior of warping.
Effect of Welded Joint Imperfection on the Integrity of Pipe Elbows Subjected to Internal Pressure
Tehnicki Vjesnik
Original scientific paper Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined. Utjecaj grešaka u zavarenom spoju na integritet cijevnih lukova izloženih djelovanju unutarnjeg tlaka Izvorni znanstvenu članak Imajući u vidu da lokalna o...
Investigation on bolt tension of flanged pipe joint subjected to bending
This paper presents an investigation on bolt tension of a flanged pipe joint subjected to bending. A finite element model to analyze the flanged pipe joint has been developed by using finite element software ANSYS. The pipe in the model has been subjected to yield moment of pipe and a non-linear finite element analysis has been performed. After that, an extensive parametric study has been carried out on the pipe joint to understand the effect of various parameters (i.e. diameter of pipe, flange width, flange thickness, number of bolts, and diameter of bolt) on bolt tension. Then a comparative study of the maximum bolt tension obtained from conventional method and finite element analysis method has been performed under certain range of parametric conditions. From the study, it has been found that some parameters have significant effect on bolt tension. For example, it has been observed that the bolt tension varies with the change in dimension of flange thickness, flange width and diameter of bolt. Actually, the present study gives us a better understanding of the behavior of flanged pipe joint subjected to bending and also helps us in evaluating the bolt tension value that is structurally effective for a flanged pipe joint.
Investigation on static strength of welded joints
2012
i Acknowledgements There was a time when every single day was a bit boring, I felt like I was trapped in a cycle of repeating daily events. I knew that I wanted more and it could not be continued in this way. I realized the passion to make a change in my life. There was always something inside saying that you can do more and you can do better. So that's why I started to discover, to expand my capacities, skills, knowledge, and experience. Applying for a master's program in materials science was the turning point towards the unfinished task that I left behind 10 years ago and I am so grateful that I was nominated in a well-known university as KTH.
Investigation of Residual Stresses and Distortion in Welded Pipe-Flange Joint of Different Classes
IIUM Engineering Journal, 2012
ABSTRACT: Pipe and flange joints are commonly used in petrochemical, nuclear and process industries. Commonly, welding is used to make these joints which produces residual stresses and distortions. These stresses have detrimental effects on the structural integrity and service performance of the welded pipe joints. The objective of this study is to investigate the residual stresses and distortions during Gas Metal Arc Welding of pipe of schedule 40, nominal diameter 200 mm with different ANSI flanges of class numbers 150, 300, 600, 900, 1500, and 2500. Welding parameters including: voltage, current and heat as inputs were selected based on the literature available. The behaviour of the flanges of different classes is also discussed. In addition, the finite element methodology presented, in this paper, can be helpful for developing welding procedures for a range of pipe flange welded joint sizes in order to control the residual stresses and deformations. This will lead to optimised p...