Incremental growth due to creep and plastic yielding of thin tubes subjected to internal pressure and cyclic thermal stresses

Bree, J.L.M.J. van

doi:10.1243/03093247v032122

Cited by 64 publications

(32 citation statements)

References 2 publications

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“…The present model demonstrates that, while cyclic yielding accelerates the process, the displace ments occur without reversed plasticity. Such a response does not coincide with the conventional denition of ratcheting (Bree, 1968). Hereafter, the event is referred to as an instability of a form dominated by propagation, since substantial imperfections pre-exist that negate initiation requirements.…”

Section: Introductionmentioning

confidence: 99%

A fundamental model of cyclic instabilities in thermal barrier systems

Karlsson

Hutchinson

Evans

2002

Journal of the Mechanics and Physics of Solids

142

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Section: Introductionmentioning

confidence: 99%

A fundamental model of cyclic instabilities in thermal barrier systems

Karlsson

Hutchinson

Evans

2002

Journal of the Mechanics and Physics of Solids

142

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“…When creep is present, the structure's response to a cyclic loading condition changes dramatically [4][5][6], with respect to the low temperature case. Due to the induced residual stresses by creep and plasticity, a closed stress strain cycle may be formed when the reverse plastic strains completely recover the inelastic strain created during loading and creep dwell periods.…”

Section: Introductionmentioning

confidence: 99%

“…When adopting the Ramberg-Osgood (RO) material model, this plastic strain amplitude can be used to update the iterative yield stress. For the load instance with creep dwell period t  , the effective creep strain c   can be calculated by equation (6) when considering a time hardening creep constitutive equation (17) in [4]. ( …”

mentioning

confidence: 99%

“…Under constant displacement loading, the stress relaxation results in no change in the total strain, as creep strain replaces elastic strain with time, where Z=1. The elastic follow-up factor is known to be influenced by loading conditions [2,6], and larger primary loads combined with longer dwell times produce larger Z. For the MMC investigated, the detailed elastic follow up factors at the location of maximum creep strain for different dwell times and 4 considered cyclic load conditions are presented in Table 3.…”

mentioning

confidence: 99%

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Creep-fatigue behaviour of aluminum alloy-based metal matrix composite

Barbera¹,

Chen²,

Liu

2016

International Journal of Pressure Vessels and Piping

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Metal Matrix Composite (MMC) represents a valuable option as structural material for different type of structures and components. Despite this they struggle to become widely adopted due to expensive manufacturing process and complex microstructural behaviour. When subjected to cyclic load conditions the structural response of MMC is not trivial, and becomes even more difficult when high temperature load is involved. Different failure mechanisms would happen and they are originated by the different material properties between the fibre and surrounding matrix. Among all, the mismatch of thermal expansion coefficient is recognized to be the dominant one. The significantly differing coefficients of thermal expansion between ceramic and metal give rise to micro thermal stresses, which enhance the initiation of matrix micro cracks. Their performance under varying load and high temperature is complex, and hence it is difficult to have a clear understanding of the structural responses, especially when fatigue and creep damages become the main failures of MMCs. To improve current understanding of the relationship between creep fatigue interaction of MMCs, the history of thermal and mechanical loading, and the creep dwell period, a highly accurate but robust direct simulation technique on the basis of the Linear Matching Method (LMM) framework has been proposed in this paper, and been applied to model the fatigue and creep behaviour of MMCs. A homogenised FE model is considered in all analyses, which consist of continuous silicon carbide fibres embedded in a square 2024T3 aluminium alloy matrix array. Various factors that affect creep and fatigue behaviours of composites are analysed and discussed, including effects of the applied load level, dwell period and temperature on the MMC's performance. The effects of reversed plasticity on stress relaxation and creep deformation of MMC are investigated, and the behaviours of cyclically enhanced creep and elastic followup are presented. A detailed study of the creep ratchetting mechanism is also performed with the concentration on the impact of temperature and different loading conditions. The accuracy of the proposed method has been verified by detailed incremental finite element analyses using the commercial finite element solver Abaqus. Such verifications further improve the understanding of the failure mechanisms identified and discussed in this work.

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“…Bree [1][2], who developed a generally applicable closed-form solution for incremental growth, found it necessary to limit his analysis to a uniaxial stress model, to linear temperature distributions through the model, and to several approximations concerning the material properties. The material property assumptions of Bree were the consideration of perfect plasticity for most of the cases, the neglecting of the Bauschinger effect, and the use of a steady-state creep representation.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study to Establish Design Curves and to Evaluate Design Rules for Ratchetting

Branca¹,

McLean²

1973

Fatigue at Elevated Temperatures

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With Inelastic analyses requiring a substantially greater expenditure of effort over elastic analyses, there is strong incentive to establish an elastic design criterion for ratchetting that is not . excessively conservative and consequently restrictive.To establish the design curves for ratchetting, the ANSYS computer program was used to develop elastic-plastic-creep solutions for several cases of a long, sodium-filled pipe. The pipe was subjected to a fluid temperature history which consists of a rapid down-transient followed by a gradual rise to operating temperature, and a 500 hr. hold time at that temperature. The parameters of the analytical solutions covered the range of interest for sodium-cooled nuclear systems. The only material considered was 304 stainless steel.Design curves were developed for ratchet strain as a function of elastic primary and secondary stress intensities and temperature.The results of this study indicate that the existing design rules of FRA-152 rev. 3 and of the proposed LMEC revision to the ASME Code Case 1331-5 for loading cycles with long hold timti are very conservative, with one exception. That exception is rule A.2.1.2(4) of the proposed revision to the ASMS Code. When compared to the results of the study, the rule is consistently and reasonably conservative for all loadings and temperatures studied.

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Incremental growth due to creep and plastic yielding of thin tubes subjected to internal pressure and cyclic thermal stresses

Cited by 64 publications

References 2 publications

A fundamental model of cyclic instabilities in thermal barrier systems

A fundamental model of cyclic instabilities in thermal barrier systems

Creep-fatigue behaviour of aluminum alloy-based metal matrix composite

Parametric Study to Establish Design Curves and to Evaluate Design Rules for Ratchetting

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