Mechanical performance of resistance-welded thermoplastic composite double lap shear specimens
Bibliographic record
Abstract
An investigation of resistance welding of thermoplastic composite double lap shear specimens is presented. Double lap shear specimens consisting of unidirectional 16-ply PEKK/carbon fibre (PEKK/CF) composite were resistance-welded using a stainless steel mesh heating element. The objective of this work was to study the mechanical performance of the double lap shear resistance-welded joints and to compare it with the single lap shear resistance-welded joints. The welded specimens were analyzed using static and fatigue lap shear tests, and optical microscopy. Lap shear strength of 49 MPa was obtained with a PEKK/CF double lap shear joint. Indefinite fatigue life was obtained with a stress level of 30% of that strength. Fracture surface observation revealed an interlaminar mode of failure with tearing of both laminate and heating element. Results from the double lap shear and the single lap shear specimens were compared and no significance difference was noted for the static tests, while a slightly better fatigue performance under low stresses was observed for double-lap-shear specimens.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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) | 0.002 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".