Plastic limit pressures for cracked pipes using finite element limit analyses

Kim, Yun Jae; Shim, Do-Jun; Huh, Nam‐Su; Kim, Young Jin

doi:10.1016/s0308-0161(02)00031-5

Cited by 79 publications

(59 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For the limit analysis, the authors have published similar papers on FE limit analyses (Kim et al 2002c;Kim and Oh 2006;Kim et al 2007), where reliability of the results from the FE limit analyses was checked. In fact, ABAQUS using the RIKS option has been found to provide quite reliable limit loads without being so sensitive to mesh density.…”

Section: Figmentioning

confidence: 99%

See 1 more Smart Citation

Limit loads and approximate J estimates for axial through-wall cracked pipe bends

et al. 2007

Self Cite

View full text Add to dashboard Cite

This paper presents plastic limit loads and approximate J estimates for axial through-wall cracked pipe bends under internal pressure and in-plane bending. These loads and estimates are based on small strain finite element limit analyses using elastic-perfectly plastic materials. Geometric variables associated with the crack and pipe bend are systematically varied, and three possible crack locations (intrados, crown and extrados) are considered. Effects of the bend and crack geometries on plastic limit loads are quantified, and closed-form limit load solutions are given. Based on the proposed limit load solutions, a reference stress based the J estimation scheme for axial through-wall cracked pipe bends under internal pressure and in-plane bending is proposed. EYoung's modulus E =E/(1 − ν 2 ) for plane strain; =E for plane stress J , J e J -integral and its elastically calculated value K Linear elastic stress intensity factor M, M L In-plane moment and limit moment of a cracked pipe bend, respectively M o , M s o Limit in-plane moment of an un-cracked pipe bend and straight pipe, respectively n Strain hardening index (1 ≤ n < ∞) for the Ramberg-Osgood model, Eq. 18 P , P L Internal pressure and limit pressure of a cracked pipe bend P o , P s o

show abstract

Section: Figmentioning

confidence: 99%

“…Based on the FE solutions, the following approximation, similar to Eq. 4, was proposed (Kim et al 2002c)…”

Section: Plastic Limit Loadsmentioning

confidence: 99%

Limit loads and approximate J estimates for axial through-wall cracked pipe bends

et al. 2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous work [2][3][4][5][6][7][8][9][10][11][12] has evaluated the plastic collapse load for pipes but these solutions have not considered the influence of residual stress, particularly long-range residual stress. Miller [2] defined the global collapse pressure as the load resulting in unbounded plastic strain in the structure and local collapse as the load leading to yielding of the local ligament or local net section.…”

Section: Introductionmentioning

confidence: 99%

“…He also gave analytical solutions for the plastic collapse pressure for closed-end pipes containing circumferential cracks. Kim and Shim et al [3][4][5] improved the accuracy of the existing analytical solutions of global collapse loads of pipes containing defects under single and combined loadings. Staat et al [7][8] used finite element methods to give solutions for local and global collapse loads of closed-end pipes with flaws.…”

Section: Introductionmentioning

confidence: 99%

Use of Elastic Follow-Up to Study the Effect of Displacement Controlled Loading on Plastic Collapse Pressures for Circumferentially Cracked Pipes

Smith

Pavier

2015

Volume 6B: Materials and Fabrication

View full text Add to dashboard Cite

General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. ABSTRACTStructural integrity assessments of pressurised pipes consider plastic collapse as a potential failure mode. This paper uses finite element analysis to explore the effect of the pipe end boundary conditions on the collapse pressure. Two end conditions are considered: a fixed axial load and a fixed axial displacement. The fixed axial displacement condition represents a long-range axial residual stress. In the R6 structural integrity assessment procedure long-range residual stress is associated with elastic follow-up. However, no guidance is given on whether the level of elastic follow-up is sufficient to justify treating long-range residual stress as a primary stress.In this paper, a method is proposed to estimate elastic follow-up of an internally pressurised pipe containing a fully circumferential crack. It is found that the elastic follow-up is related to the length of the pipe. A short pipe that contains a fully circumferential crack, subjected to a displacement induced axial stress, has a global collapse that is not modified by the fixed displacement condition. The short pipe corresponds to a small elastic follow-up factor, Z. However, as the elastic follow-up factor increases, the presence of long-range residual stress starts to make a contribution to global collapse. When elastic follow-up is significant, a long-range residual stress has the same effect on global collapse as does a mechanical stress.

show abstract

“…The core part of the analysis of the integrity of pipes is how to efficiently and precisely make an estimate of maximum allowed pressure and determine parameters of mechanical fracture, such as tensile strength factors (K Ic ) and J-integral of defect pipes. As opposed to internal circular and axial semi-elliptic surface cracks [4][5][6][7][8][9][10][11][12][13][14][15]17], a very limited number of studies is in the area which deals with the determination of K Ic and J-integral for pipes with external axial semi-elliptic surface cracks [13]. So far, no detailed 3D finite element analysis (FEA) exist for a wide range of surface cracks on the external area of pipes.…”

Section: Introductionmentioning

confidence: 99%