Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading

Weihang Chen, Haofeng Chen, Tianbai Li, James Michael Ure

Research output: Contribution to conferencePaper

Abstract

In this study, the limit load, shakedown and ratchet limit of a defective pipeline subjected to constant internal pressure and a cyclic thermal gradient are analyzed. Ratchet limit and maximum plastic strain range are solved by employing the new Linear Matching Method (LMM) for the direct evaluation of the ratchet limit. Shakedown and ratchet limit interaction diagrams of the defective pipeline identifying the regions of shakedown, reverse plasticity, ratcheting and plastic collapse mechanism are presented and parametric studies involving different types and dimensions of part-through slot in the defective pipeline are investigated. The maximum plastic strain range over the steady cycle with different cyclic loading combinations is evaluated for a low cycle fatigue assessment. The location of the initiation of a fatigue crack for the defective pipeline with different slot type is determined. The proposed
linear matching method provides a general-purpose technique for the evaluation of these key design limits and the plastic strain range for the low cycle fatigue assessment. The results for the defective pipeline shown in the paper confirm the applicability of this procedure to complex 3-D structures.

Conference

ConferenceASME Pressure Vessels & Piping Conference, PVP 2011
CountryUnited States
CityBaltimore,
Period17/07/1121/07/11

Fingerprint

Ratchet
Pipelines
Internal
Plastics
Plastic deformation
Low Cycle Fatigue
Fatigue of materials
Range of data
Load limits
Fatigue Crack
Cyclic Loading
Thermal gradients
Evaluation
Plasticity
3D
Hot Temperature
Reverse
Diagram
Gradient
Cycle

Keywords

  • shakedown
  • ratchet limit
  • lineasr matching method
  • defective pipeline

Cite this

Chen, W., Chen, H., Li, T., & Ure, J. M. (2011). Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading. Paper presented at ASME Pressure Vessels & Piping Conference, PVP 2011, Baltimore, , United States.
Chen, Weihang ; Chen, Haofeng ; Li, Tianbai ; Ure, James Michael. / Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading. Paper presented at ASME Pressure Vessels & Piping Conference, PVP 2011, Baltimore, , United States.
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abstract = "In this study, the limit load, shakedown and ratchet limit of a defective pipeline subjected to constant internal pressure and a cyclic thermal gradient are analyzed. Ratchet limit and maximum plastic strain range are solved by employing the new Linear Matching Method (LMM) for the direct evaluation of the ratchet limit. Shakedown and ratchet limit interaction diagrams of the defective pipeline identifying the regions of shakedown, reverse plasticity, ratcheting and plastic collapse mechanism are presented and parametric studies involving different types and dimensions of part-through slot in the defective pipeline are investigated. The maximum plastic strain range over the steady cycle with different cyclic loading combinations is evaluated for a low cycle fatigue assessment. The location of the initiation of a fatigue crack for the defective pipeline with different slot type is determined. The proposedlinear matching method provides a general-purpose technique for the evaluation of these key design limits and the plastic strain range for the low cycle fatigue assessment. The results for the defective pipeline shown in the paper confirm the applicability of this procedure to complex 3-D structures.",
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note = "ASME Pressure Vessels & Piping Conference, PVP 2011 ; Conference date: 17-07-2011 Through 21-07-2011",

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Chen, W, Chen, H, Li, T & Ure, JM 2011, 'Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading' Paper presented at ASME Pressure Vessels & Piping Conference, PVP 2011, Baltimore, , United States, 17/07/11 - 21/07/11, .

Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading. / Chen, Weihang; Chen, Haofeng; Li, Tianbai; Ure, James Michael.

2011. Paper presented at ASME Pressure Vessels & Piping Conference, PVP 2011, Baltimore, , United States.

Research output: Contribution to conferencePaper

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T1 - Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading

AU - Chen, Weihang

AU - Chen, Haofeng

AU - Li, Tianbai

AU - Ure, James Michael

PY - 2011/7/17

Y1 - 2011/7/17

N2 - In this study, the limit load, shakedown and ratchet limit of a defective pipeline subjected to constant internal pressure and a cyclic thermal gradient are analyzed. Ratchet limit and maximum plastic strain range are solved by employing the new Linear Matching Method (LMM) for the direct evaluation of the ratchet limit. Shakedown and ratchet limit interaction diagrams of the defective pipeline identifying the regions of shakedown, reverse plasticity, ratcheting and plastic collapse mechanism are presented and parametric studies involving different types and dimensions of part-through slot in the defective pipeline are investigated. The maximum plastic strain range over the steady cycle with different cyclic loading combinations is evaluated for a low cycle fatigue assessment. The location of the initiation of a fatigue crack for the defective pipeline with different slot type is determined. The proposedlinear matching method provides a general-purpose technique for the evaluation of these key design limits and the plastic strain range for the low cycle fatigue assessment. The results for the defective pipeline shown in the paper confirm the applicability of this procedure to complex 3-D structures.

AB - In this study, the limit load, shakedown and ratchet limit of a defective pipeline subjected to constant internal pressure and a cyclic thermal gradient are analyzed. Ratchet limit and maximum plastic strain range are solved by employing the new Linear Matching Method (LMM) for the direct evaluation of the ratchet limit. Shakedown and ratchet limit interaction diagrams of the defective pipeline identifying the regions of shakedown, reverse plasticity, ratcheting and plastic collapse mechanism are presented and parametric studies involving different types and dimensions of part-through slot in the defective pipeline are investigated. The maximum plastic strain range over the steady cycle with different cyclic loading combinations is evaluated for a low cycle fatigue assessment. The location of the initiation of a fatigue crack for the defective pipeline with different slot type is determined. The proposedlinear matching method provides a general-purpose technique for the evaluation of these key design limits and the plastic strain range for the low cycle fatigue assessment. The results for the defective pipeline shown in the paper confirm the applicability of this procedure to complex 3-D structures.

KW - shakedown

KW - ratchet limit

KW - lineasr matching method

KW - defective pipeline

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M3 - Paper

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Chen W, Chen H, Li T, Ure JM. Limit, shakedown and ratchet analyses of defective pipeline under internal pressure and cyclic thermal loading. 2011. Paper presented at ASME Pressure Vessels & Piping Conference, PVP 2011, Baltimore, , United States.