Experimental Investigation of Mechanical Behaviour of Hybrid Bolted/Bonded Joints for Aircraft
Bibliographic record
Abstract
The hybrid bolted/bonded joint is an emerging aircraft structural joint configuration that is expected to have two advantages over traditional joint configurations: 1) improved joint strength over the traditional joints and 2) fail-safe design. However, previous studies found no advantages from the bolted/bonded joints mainly due to the adhesive stiffness. Using stiff adhesive resulted in two joints behaving independently. The objective of this thesis is to experimentally investigate the mechanical behaviour of the hybrid bolted/bonded joint with the softer paste adhesive. This thesis verifies the measurement technique, Digital Image Correlation (DIC), which is introduced to the research group for the first time. The DIC technique is verified with the axial extensometer by measuring displacement and strain fields from the simple aluminum test coupon. Additionally, the DIC technique with the instrumented bolt, which is the classic measurement technique to obtain shear load in the bolt, is examined in the bolted/bonded joint configuration. Lastly, the DIC technique is used to investigate the surface strain field changes in different joint configurations. Unique observations are made in each joint configuration, and are presented in this thesis.
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How this classification was reachedexpand
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 | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".