Distinguishing Ratcheting and Shakedown Conditions in Pressure Vessels

Reinhardt, Wolf

doi:10.1115/pvp2003-1885

Cited by 9 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…-Ratcheting is where there is a plastic strain increment accumulated in every cycle [1][2][3][4]. Figure 1 displays the diagram constructed by Bree [1] that describes the thermal and mechanical load magnitudes required when applied in combination to induce these different behaviours in his proposed model of an element of thickness of a hollow tube.…”

Section: Introductionmentioning

confidence: 99%

“…Elastic and Plastic shakedown can lead to failure in a component as a result of fatigue [3,4], and the number of permissible cycles are defined in the ASME Boiler & Pressure Vessel Codes that account for circumstances that induce these cyclic behaviours. Ratcheting is particularly undesirable as unhindered it will inevitably lead to failure due to accumulated plastic deformation causing a global plastic collapse mechanism [1][2][3][4]. As a result of this, it is important when designing pressure components to ensure protection from failure by ratcheting.…”

Section: Introductionmentioning

confidence: 99%

“…It is often considered that thermal and secondary cyclic loads applied in the absence of a mechanical primary load are unlikely to result in ratcheting [1][2][3][4]. Most Standards and Codes incorporate this assumption in the prevention of ratcheting.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An FEA Investigation Into Ratchetting Induced Purely by Cyclic Thermal Loading

Campbell

Mackenzie

2014

Volume 5: High-Pressure Technology; ASME NDE Division; 22nd Scavuzzo Student Paper Symposium and Competition

View full text Add to dashboard Cite

A detailed finite element investigation of the cyclic elastic-plastic response of three model structures subject to thermal and mechanical loading is presented within the context of ASME B&PV Code Section VIII Division 2 design requirements. The model structures are a thin tube subject to constant internal pressure and a cyclic throughthickness linear temperature gradient (the Bree problem), a three bar system subject to cyclic thermal loading only and an intermediate thickness tube subject to internal pressure and an axially moving cyclic temperature wave. Incremental elastic-plastic finite element analysis assuming an elasticperfectly-plastic material model and small deformation theory is performed for each model structure and ratchet and shakedown boundaries determined by application of a bisection method. Results are compared with ASME VIII ratcheting assessment procedures. The results show that in the Bree problem ratcheting does not occur under thermal loading alone, as expected, however for the two other sample structures it is shown that ratchetting can occur under thermal loading for structures subject to specific deformation constraints. The lead author is an MS level student at the University of Strathclyde.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An FEA Investigation Into Ratchetting Induced Purely by Cyclic Thermal Loading

Campbell

Mackenzie

2014

Volume 5: High-Pressure Technology; ASME NDE Division; 22nd Scavuzzo Student Paper Symposium and Competition

View full text Add to dashboard Cite

show abstract

“…Numerous papers were published on ratcheting in ASME Pressure Vessel & Piping Division Conferences and journals. An excellent summary of the basic issues involved in ratcheting can be found in a paper by Reinhardt 1 .…”

Section: Introductionmentioning

confidence: 99%

Local Ratcheting by Elastic-Plastic FEA: Criteria and Code Based Approaches

Rudolph¹,

Kalnins

̈tz³

et al. 2011

Volume 1: Codes and Standards

View full text Add to dashboard Cite

Emanating from a discussion of local ratcheting effects and appropriate limiting criteria this paper examines existing ratcheting rules based on local (or material) response that are currently in Section III of the ASME B&PV Code, German KTA rules, and other design codes. The objective is to offer clarification of the rules that may be useful to the designer, their bases and practical application. Among these rules, different ratcheting checks are required that use different ratcheting measures. The paper considers only the rules for which the ratcheting checks can be evaluated by a direct cycle-by-cycle elastic-plastic FEA. Examples are provided to illustrate the procedures.Note that Section III of the ASME B&PV Code and the German KTA rule 3201.2 both address Local Ratcheting within the elastic-plastic ratcheting check. Furthermore, the code based ratcheting check is closely related to the fatigue check.Further rules are given in EN 13445-3 4 .

show abstract

“…theoretical results; Hübel (1996) 2 considered the concepts of material and structural ratcheting; Kalnins (2001 experimental results for a pressurized pipe subjected to cyclic bending and compared them with theoretical simulations. An excellent summary of the basic issues involved in ratcheting was given by Reinhardt (2003) 9 .…”

Section: Introductionmentioning

confidence: 99%

Global Ratcheting by Elastic-Plastic FEA According to ASME Section VIII Rules

Kalnins

Rudolph²

2011

Volume 1: Codes and Standards

View full text Add to dashboard Cite

A framework of global ratcheting is developed for which the ratcheting measure is incremental permanent change of shape of a vessel or component. The changes of shape are such that they reduce the resistance to collapse, and, upon extended cycling, can lead to eventual failure by collapse. A ratcheting check is designed to prevent this failure. This framework fits the ratcheting rules that are currently in the 2010 Section VIII of the ASME B&PV Code. Tools are provided for ratcheting assessment based on this framework, and examples are presented that illustrate their application. BACKGROUNDNumerous papers have been published on ratcheting in conference proceedings and journals. Among those that use direct cycle-by-cycle, elastic-plastic FEA, the following are cited. Garud (1993) 1 reported experimental results on ratcheting of an elbow-pipe assembly and compared them with

show abstract

Distinguishing Ratcheting and Shakedown Conditions in Pressure Vessels

Cited by 9 publications

References 0 publications

An FEA Investigation Into Ratchetting Induced Purely by Cyclic Thermal Loading

An FEA Investigation Into Ratchetting Induced Purely by Cyclic Thermal Loading

Local Ratcheting by Elastic-Plastic FEA: Criteria and Code Based Approaches

Global Ratcheting by Elastic-Plastic FEA According to ASME Section VIII Rules

Contact Info

Product

Resources

About