Residual stress simulation in thin and thick-walled stainless steel pipe welds including pipe diameter effects

Yaghi, A.H.; Hyde, T H; Becker, A.A.; Sun, Wei; Williams, John A.

doi:10.1016/j.ijpvp.2006.08.014

Cited by 141 publications

(60 citation statements)

References 13 publications

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“…현재까지 원주 용접된 강관에 발생하는 잔류응력 예측에 관한 연구는 상당히 많이 이루어져 왔다 (Brickstad and Josefson, 1998;Mochizuki et al, 2000;Yaghi et al, 2006) 여기서 는 온도, 는 열전도율, c는 비열, 는 밀도이고 는 단위 체적당 이동 입열량이다. 입열은 표면입열과 체적입열을 동시에 고려하였으며 (Deng et al, 2007), 재료가 가지는 물리상수의 온도의존성을 고려하였다.…”

Section: Abstract Abstractunclassified

Behavior of girth-welded buried steel pipes under external pressure

Jeon¹,

Lee²,

Chang³

2015

Journal of The Korean Society of Disaster Information

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This paper presents finite element (FE) analyses to clarify the effects of external pressure on the residual stresses in a girth-welded steel pipe. At first, FE simulation of the girth welding process is carried out to obtain the weld-induced residual stresses employing sequentially coupled three-dimensional (3-D) thermo-mechanical FE formulation. Then, 3-D elastic-plastic FE analyses incorporating the residual stresses and plastic strains obtained from the preceding FE simulation are performed to investigate the residual stress behavior in the girth-welded pipe under external pressure. The FE analysis results show that the hoop compressive stresses induced by the external pressure significantly alter the hoop residual stresses in the course of the mechanical loading.Girth-welded steel pipe Weld-induced residual stresses Residual stress behavior External pressure Three-dimensional finite element analysis

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Section: Abstract Abstractunclassified

Behavior of girth-welded buried steel pipes under external pressure

Jeon¹,

Lee²,

Chang³

2015

Journal of The Korean Society of Disaster Information

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“…Large displacement effects have been incorporated in the simulation by including the non-linear geometry option, NLGEOM [12]. The 'element birth' technique is used, simulating weld elements during their application to bring them into existence in the structural analysis without incurring strain incompatibilities, details of which have been described in previous publications [5,7,11]. The 'element birth' technique generates the mesh representing the weld part from the start of the FE analysis, keeping the weld elements at an assumed softening temperature, TSOFT, via a user subroutine [12], until the moment of weld application in the structural analysis.…”

Section: Thermal and Structural Fe Modellingmentioning

confidence: 99%

“…The results are then presented in the form of axial and hoop stresses throughout the pipe wall thickness and also against distance from the weld centre along the outer surface of the pipe. Although, in reality, welding is a three-dimensional procedure, it is often considered sufficient to represent a pipe weld using an axisymmetric FE model [5][6][7][8][9][10][11], which is considerably faster and easier to simulate, and which has been adopted throughout this work.…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of welding and residual stresses in a P91 steel pipe incorporating solid-state phase transformation and post-weld heat treatment

Yaghi

Hyde

Becker

et al. 2008

The Journal of Strain Analysis for Engineering Design

120

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The finite element (FE) method has been applied to simulate residual axial and hoop stresses generated in the weld region and heat-affected zone of an axisymmetric 50-bead circumferentially butt-welded P91 steel pipe, with an outer diameter of 145 mm and wall thickness of 50 mm. The FE simulation consists of a thermal analysis and a sequentially coupled structural analysis. Solid-state phase transformation (SSPT), which is characteristic of P91 steel during welding thermal cycles, has been modelled in the FE analysis by allowing for volumetric changes in steel and associated changes in yield stress due to austenitic and martensitic transformations. Phase transformation plasticity has also been taken into account. The effects of post-weld heat treatment (PWHT) have been investigated, including those of heat treatment holding time. Residual axial and hoop stresses have been depicted through the pipe wall thickness as well as along the outer surface of the pipe. The results indicate the importance of including SSPT in the simulation of residual stresses during the welding of P91 steel as well as the significance of PWHT on stress relaxation.

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“…Wei and Wang [17] established a finite element model of original residual stress to analyze the corresponding deflection by machining aerospace thin-walled parts, especially in machining large aerospace parts, and simulation results were validated approximately consistent with experimental results. Yaghi et al [18] discussed the residual stress in thin-and thick-walled stainless steel pipe-welded components and presented a brief review of weld simulation, and analyzed more FE models with an inside radius to wall thickness ratio to investigate the effect of pipe diameter on residual stress. Wu and Li [19] proposed a numerical approach to predict the surface residual stress and strain gradients resulting from a 3D milling process.…”

Section: Introductionmentioning

confidence: 99%

Detecting Milling Deformation in 7075 Aluminum Alloy Aeronautical Monolithic Components Using the Quasi-Symmetric Machining Method

Zhang

2016

Metals

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Abstract:The deformation of aeronautical monolithic components due to CNC machining is a bottle-neck issue in the aviation industry. The residual stress releases and redistributes in the process of material removal, and the distortion of the monolithic component is generated. The traditional one-side machining method will produce oversize deformation. Based on the three-stage CNC machining method, the quasi-symmetric machining method is developed in this study to reduce deformation by symmetry material removal using the M-symmetry distribution law of residual stress. The mechanism of milling deformation due to residual stress is investigated. A deformation experiment was conducted using traditional one-side machining method and quasi-symmetric machining method to compare with finite element method (FEM). The deformation parameters are validated by comparative results. Most of the errors are within 10%. The reason for these errors is determined to improve the reliability of the method. Moreover, the maximum deformation value of using quasi-symmetric machining method is within 20% of that of using the traditional one-side machining method. This result shows the quasi-symmetric machining method is effective in reducing deformation caused by residual stress. Thus, this research introduces an effective method for reducing the deformation of monolithic thin-walled components in the CNC milling process.

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Residual stress simulation in thin and thick-walled stainless steel pipe welds including pipe diameter effects

Cited by 141 publications

References 13 publications

Behavior of girth-welded buried steel pipes under external pressure

Behavior of girth-welded buried steel pipes under external pressure

Finite element simulation of welding and residual stresses in a P91 steel pipe incorporating solid-state phase transformation and post-weld heat treatment

Detecting Milling Deformation in 7075 Aluminum Alloy Aeronautical Monolithic Components Using the Quasi-Symmetric Machining Method

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