Effect of local wall thinning on ratcheting behavior of pressurized 90° elbow pipe under reversed bending using finite element analysis

2016 ◽  
Vol 20 (4) ◽  
pp. 931-950 ◽  
Author(s):  
Xiaohui Chen ◽  
Xu Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Wall Thinning ◽  
Local Wall Thinning

3428 Finite element analysis of failure behavior of elbow pipe with local wall thinning

2006 ◽  
Vol 2006.1 (0) ◽  
pp. 567-568
Author(s):  
Tomohiro UENO ◽  
Koji TAKAHASHI ◽  
Kotoji ANDO ◽  
Akitaka HIDAKA ◽  
Masakazu HISATSUNE ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Behavior ◽  
Element Analysis ◽  
Wall Thinning ◽  
Local Wall Thinning

Allowable Limit and Finite Element Analysis of Pipes With Local Wall Thinning Subjected to Bending Moment

2004 ◽  
Author(s):  
Seok Hwan Ahn ◽  
Ki Woo Nam ◽  
Koji Takahashi ◽  
Kotoji Ando
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Modes ◽  
Bending Test ◽  
Element Analysis ◽  
Allowable Limit ◽  
Pipe Surface ◽  
Wall Thinning ◽  
Plastic Analysis ◽  
Local Wall Thinning

Fracture behaviors of pipes with local wall thinning are very important for the integrity of power plant piping system. In this study, monotonic bending tests without internal pressure are conducted on 1.91-inch diameter Schedule 80 STS370 full-scale carbon steel pipe specimens. Fracture strengths of locally wall thinned pipes were calculated by elasto-plastic analysis using finite element method. The elasto-plastic analysis was performed by FE code ANSYS. We simulated various types of local wall thinning that can be occurred at pipe surface due to coolant flow. Locally wall thinned shapes were machined to be different in size along the circumferential or axial direction of straight pipes. We investigated fracture strengths and failure modes of locally wall thinned pipes by four-point bending test. From the test results, failure modes could be divided three types, ovalization, local buckling and crack initiation. And, the allowable limit of pipes with local wall thinning was investigated. In addition, we compared the simulated results by finite element analysis with experimental data. The failure mode, fracture strength and fracture behavior obtained from the tests showed well agreement with analytic results.

Finite element analysis on fracture behavior of pipe with local wall thinning

2004 ◽  
Vol 2004 (0) ◽  
pp. 81-82
Author(s):  
Kazuomi KAWATO ◽  
Masato ONO ◽  
Koji TAKAHASHI ◽  
Kotoji ANDO ◽  
Ki-Woo Nam
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Behavior ◽  
Element Analysis ◽  
Wall Thinning ◽  
Local Wall Thinning

Evaluation of Fracture Behavior for Pressurized T-Pipe by Finite Element Analysis

2012 ◽  
Author(s):  
Naoki Miura ◽  
Katsuhiko Yamakami ◽  
Kotaro Iwahara ◽  
Kiyoharu Tsunokawa ◽  
Kozo Miyao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Property ◽  
Fracture Behavior ◽  
Welded Joint ◽  
Three Dimensional ◽  
Element Analysis ◽  
Wall Thinning ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

T-pipe is one of the typical structural elements of LWR piping as well as T-joint. In the present situation, the evaluation of wall thinning for T-pipe is accomplished by assuring the sufficient strength around the opening area by using the design and construction code. This evaluation often assumes the replacement of a local wall thinning with a global wall thinning, which leads to excessively conservative prediction of burst pressures. In this study, three-dimensional finite element analysis was conducted to simulate the fracture behavior of a pressurized T-pipe test. The accuracy of the predicted burst pressures and appropriate modeling of the welded joint at the junction of the main and branch pipes were investigated. It was found that the burst pressure could be adequately predicted by applying a proper fracture criterion. Allocation of experimental tensile property of weld metal to the welded joint gave more accurate prediction; nevertheless, allocation of experimental tensile property of base metal to the welded joint enabled suitably conservative prediction.

Finite Element Analysis on the Failure Behavior of Straight Pipe With Wall Thinning

2004 ◽  
Author(s):  
Ken Inoue ◽  
Koji Takahashi ◽  
Kotoji Ando ◽  
Seok Hwan Ahn ◽  
Ki Woo Nam ◽  
...  
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Local Buckling ◽  
Metal Loss ◽  
Failure Behavior ◽  
Straight Pipe ◽  
Element Analysis ◽  
Deformation And Failure ◽  
Wall Thinning ◽  
Local Wall Thinning

Monotonic four-point bending tests were conducted using straight pipe specimens 102 mm in diameter with local wall thinning in order to investigate the effects of the depth, shape, and location of wall thinning on the deformation and failure behavior of pipes. The local wall thinning simulated erosion/corrosion metal loss. The deformation and fracture behavior of the straight pipes with local wall thinning was compared with that of non wall-thinning pipes. The failure modes were classified as local buckling, ovalization, or crack initiation depending on the depth, shape, and location of the local wall thinning. Three-dimensional elasto-plastic analyses were carried out using the finite element method. The deformation and failure behavior, simulated by finite element analyses, coincided with the experimental results.

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