Studies of Residual Stress in Single-Row Countersunk Riveted Lap Joints
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Bibliographic record
Abstract
Variations of stress and strain, from the riveting process through the tensile loading stage in lap joints with a single countersunk rivet, were studied experimentally and numerically. In situ microstrain gauges were used to measure the strain variations during the entire loading sequence. Three-dimensional finite element (FE) models were generated to simulate the experimental setup. The material elastoplastic constitutive relationship and geometric nonlinear properties, as well as nonlinear contact boundary conditions, were included in the numerical simulations. The numerical modeling techniques were validated using the experimental data. The residual minimum principal stress resulting from the riveting process and the maximum principal stress when the joints were in tension, determined from the FE analyses, are presented. The stress variations along a prescribed path are also presented. The aim of the research is to develop an accurate three-dimensional numerical technique to study the residual stress and strain as well as the stress and strain variations that occur during the entire loading history.
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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)
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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