Investigation of Flexibility Factors and Stress Indices for Class 1 Curved Piping
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Bibliographic record
Abstract
In the analysis of piping, consideration of the behaviour of bends and elbows is essential. Due to the ovalization phenomenon, the bends exhibit more flexibility under bending moment loading than straight pipes, while generating comparatively higher stresses. This has been recognized in the ASME Code for Class 1 piping, where flexibility factors and stress indices have been given for curved pipes. It has been understood that the values of stress indices given in the Code are conservative. As a result, extensive research has been performed to obtain lower values, as allowed by the Code. However, these studies have been performed separately from the flexibility factors, where research is generally lacking. The Code recognizes that the given flexibility factors have limited scope of use and more work on this issue has been proposed. It is evident that a more realistic assessment of pipe bends has to be based on revised stress indices and flexibility factors. In this paper, a number of compound bends are studied, where on one hand the stress indices are conservative and on the other the flexibility factors of the Code may not be applicable. For this purpose, the behaviour of these bends is simulated using 3D finite element models. Using these models and by comparison to the flexibility and stresses in straight pipes, flexibility factors and stress indices for the bends are obtained. A comparison to the values in the literature and discussion of different factors contributing to these values are presented.
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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)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it