Installation behaviour of ASTM F1852 twist-off type tension control bolts
Why this work is in the frame
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Bibliographic record
Abstract
In current RCSC Specification, ASTM F1852 twist-off tension-control bolt assemblies are directly recognized and twist-off-type tension-control bolt pretensioning is considered as one of the four bolt pretensioning methods. Twist-off tension-control bolt is characterized by the splined end which will be sheared off at a circular notch (torque control groove) when the required pretension is reached. Twist-off tension-control pretensioning is in fact based on torque control. Factors that affect the pretension of twist-of bolts are the bolt material strength, geometric properties of the bolts, thread conditions, lubrication conditions at the bolt and nut threads as well as the washer. A series of test programmes were performed to examine the influence of lubricants on installation, including time delays, weather conditions at time of installation, as well as the effects of other parameters on the bolt pretension. In addition, reinstallations of removed twist-off tension-control bolts with turn-of-nut pretensioning method were also investigated.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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.
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