An Experimental Investigation of Spall Fracture in Neat Epoxy and an Epoxy/Carbon Nanotube Composite
Bibliographic record
Abstract
The spall strength of a material can be used to parameterize its ability to resist tensile failure under high-strain-rate loading. Dynamic failure in an assortment of representative materials was studied. A focus was placed on characterizing the mechanical properties of a polymer-matrix composite. Load frame testing was carried out to measure mechanical properties at quasi-static strain rates, while plate impact experiments were conducted to examine material response under dynamic loading conditions. Successful identification of the spall strengths and fracture toughnesses of aluminum 6061-T6 and polymethylmethacrylate (PMMA) validated the methods used in this investigation. An effect of the curing agent on the spall strength of an epoxy was identified. Nanotubes were found to have a detrimental effect on the dynamic mechanical properties of the resulting nanocomposite. Fracture surfaces of recovered nanocomposite fragments were imaged using a scanning electron microscope to identify failure mechanisms and propose a failure process.
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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 | 0.000 |
| 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 | 0.001 | 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".