Material characterization of components and assembled behavior of a composite liner for rehabilitation of cast iron pressure pipes
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Bibliographic record
Abstract
Abstract Work is underway to determine the stability limit states for a cast in place composite liner system used to repair cast iron pressure water pipes. To establish its performance in bridging ring fractures, perforations, and other failures in the cast iron “host” pipe, it is important that the material characteristics of this composite liner be determined. This study characterizes the mechanical properties of this liner in both the longitudinal and circumferential directions, and develops a method to achieve this goal. A technique is developed to form the liner from its individual components and prepare coupons with end tabs. Test results for coupons oriented parallel to the axis of the pipe (i.e., in the longitudinal direction) agree well with those obtained from coupons cut from a liner exhumed from an actual field installation. Since the coupons formed in the laboratory are flat, the same technique is used to test the liner in the hoop (or circumferential) direction. Tensile strength and stiffness in the hoop direction are 45% higher than that in the longitudinal direction. Tests performed on the individual components of the liner are also reported, and these explain the bilinear stress–strain response. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers
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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