Determinación de un elemento de volumen representativo de probetas de tablero tensado
Bibliographic record
Abstract
El objetivo de este estudio fue definir un elemento de volumen representativo para caracterizar las propiedades mecánicas de probetas de tableros tensados de Pinus radiata D. Don y de Eucalyptus nitens. La determinación del elemento de volumen representativo permitió identificar la sección más pequeña de las probetas que presenta las particularidades de este material compuesto y por consiguiente, representa a la probeta en su conjunto. Para esto, las propiedades nanomecánicas de las paredes celulares y lamela media fueron determinadas por nanoindentaciones. Este estudio se desarrolló en dos etapas. En la primera etapa, el anillo de crecimiento representativo de las piezas de madera bajo compresión perpendicular a la fibra, fue determinado. En la segunda etapa, el tablón representativo de la probeta de tablero tensado sometido a compresión a largo plazo, fue determinado. Los resultados de la primera etapa, mostraron que no existe una tendencia específica de las propiedades nanomecánicas a través de los anillos de crecimiento en la sección transversal de las piezas de Pinus radiata y Eucalyptus nitens bajo compresión perpendicular a la fibra. En la segunda etapa, se estableció que los esfuerzos de compresión a largo plazo en la probeta de tablero tensado principalmente afectaron las propiedades nanomecánicas de la estructura celular de los tablones exterior y central de la probeta. Lo anterior permitió establecer que el elemento de volumen representativo de una probeta de tablero tensado se localizó en la madera temprana del anillo de crecimiento más alejado a la médula en la sección transversal del tablón central. AbstractThe aim of this study was to define a representative volume element to characterize the mechanical properties of stress-laminated deck specimens of radiata pine and Eucalyptus nitens. The determination of the representative volume element allowed to identify the smallest representative section of the stress-laminated deck. For this, the nanomechanical properties of the cell walls and middle lamellas were determined by nanoindentations. This study was conducted in two phases. In the first phase, the growth ring representative of the pieces of wood under compression perpendicular to the grain was determined. In the second phase, the board representative of the stress-laminated deck specimens subjected to long-term compression loads and variable environmental conditions was determined. The results obtained in the first phase of the study showed that there was no specific tendency of the nanomechanical properties through growth rings in the cross-section of Pinus radiata and Eucalyptus nitens specimens subjected to compression loads perpendicular to the grain. In the second phase of the study, it was found that long-term compression loads in stress-laminated deck specimens mainly affect the mechanical properties of the cellular structure of exterior and central boards. Finally, the representative volume element in a stress-laminated deck specimen was found in the earlywood of the growth ring farthest to the pith in the cross section of the central board.
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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 | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".