Nonlinear Cycling Analysis of Pipe Bends With Initial Ovality
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Bibliographic record
Abstract
The paper presents the nonlinear shakedown analysis using finite element method for piping bends taking account of the maximum ovality tolerance. In the ASME Code, Section III NB-4223.2, it is required that the ovality tolerance of piping after bending shall be considered when the pipe structure is subjected to any combination of cyclic thermal and pressure loads. Parametric studies are carried out to assess the progressive strain accumulation induced by various finite element analyses employing different types of boundary conditions and cycling loading. The resulting strain state of the stabilized cycle for the pipe bend including the maximum ovality tolerance is compared with the strain state for the perfectly round pipe bend. This paper also discusses the choice of the global shakedown related to the global in-plane strain and the local shakedown defined as the radial strain on the side of the elbows. Furthermore, the strain range is taken as the representative parameter for fatigue calculations.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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