Welding Seam Tracking and Inspection Robot Based on Improved YOLOv8s-Seg Model

Sensors, Journal Year: 2024, Volume and Issue: 24(14), P. 4690 - 4690

Published: July 19, 2024

A weld is the main connection form of special equipment, and a also most vulnerable part equipment. Therefore, an effective detection great significance to improve safety The traditional inspection method not only time-consuming labor-intensive, but expensive. welding seam tracking robot can greatly efficiency save on costs. this paper proposes based YOLOv8s-seg. Firstly, MobileNetV3 lightweight backbone network used replace YOLOv8s-seg reduce model parameters. Secondly, we reconstruct C2f prune number output channels new building module C2fGhost. Finally, in order make up for precision loss caused by model, add EMA attention mechanism after each layer neck model. experimental results show that accuracy recognition reaches 97.8%, size 4.88 MB. improved embedded Jetson nano, control system detection, TensorRT accelerate reasoning total time from image segmentation path fitting 54 ms, which meets real-time requirements realizes planning inspecting efficiently accurately.

Language: Английский

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Investigation on Dynamic and Static Modulus and Creep of Bio-Based Polyurethane-Modified Asphalt Mixture

Polymers, Journal Year: 2025, Volume and Issue: 17(3), P. 359 - 359

Published: Jan. 28, 2025

The superior mechanical qualities of polyurethane have garnered increasing attention for its application in modifying asphalt mixtures. However, needs to use polyols cure, and need be produced by petroleum refining. As we all know, is a non-renewable energy source. In order reduce oil consumption conform the trend green economy, lignin chitin were used instead as curing agents. this paper, biological polyurethane-modified mixture (BPA-16) was designed compared with (PA-16) matrix (MA-16). viscoelastic characteristics three mixtures evaluated using dynamic modulus, static creep tests. interplay between modulus frequency examined, along variations correlation modulus. behavior ultimately examined uniaxial load test. findings indicate that BPA-16 exceeds those PA-16 MA-16 8.7% 30.4% at 25 Hz −20 °C, respectively. At 50 phase angle decreases 26.3% relative MA-16. Lignin chitin, when utilized agents place polyol, can enhance stability low temperatures diminish their temperature sensitivity. A bio-based also maintain better elastic properties wider range. −20–20 moduli BPA-16, are linear, they converted formula different frequencies. failure stages PA-16, not observed during 3600 s duration, exhibiting least strain, indicating resistance permanent deformation PU-modified mixes.

Language: Английский

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Preparation and characterization of epoxy vitrimer asphalt based on transesterification dynamic covalent bond system

Fuel, Journal Year: 2025, Volume and Issue: 388, P. 134530 - 134530

Published: Feb. 3, 2025

Language: Английский

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Development and characterisation of a novel thermosetting natural rubber-modified asphalt

Construction and Building Materials, Journal Year: 2025, Volume and Issue: 473, P. 140985 - 140985

Published: March 28, 2025

Language: Английский

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Impact of Curing Time and Temperature on Bond Performance of Epoxy Resin Adhesives for Steel Bridge Decks

Polymers, Journal Year: 2025, Volume and Issue: 17(8), P. 1018 - 1018

Published: April 9, 2025

The bonding performance of epoxy resin adhesives plays a critical role in ensuring interlayer adhesion and long-term durability steel bridge deck pavements. However, the construction environment temperature curing time significantly influence properties adhesives. To address this issue, systematic evaluations tack-free were conducted. results demonstrate that under identical durations, tensile bond strength between layer plate increases with higher temperatures. Similarly, at constant temperatures, extended times lead to improved strength. Both temperatures longer durations reduce adhesive. Under natural outdoor conditions, adhesive achieves design requirements for both after 48 h curing, optimal workability. Conversely, prolonged beyond 72 reduced while maintaining acceptable time. For ambient duration is determined be 48~72 h, balancing (preventing equipment). This research offers technical guidance field pavement on decks by establishing protocols ensure reliable

Language: Английский

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Novel reactive phenolphthalein‐based polyether ketone, its scale‐up preparation and high‐efficiency toughening in epoxy resin modification

Polymer Engineering and Science, Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

Abstract Incorporating reactive groups that can participate in epoxy cross‐linking into traditional thermoplastic toughening agents enhances the interfacial compatibility between and thermosetting resins, thereby improving impact toughness of system. In this study, hydroxyl end were integrated phenolphthalein polyether ketone (PEKC) molecular chains to engage reaction during curing, significantly enhancing effect on The results indicate hydroxyl‐terminated (PEKC‐OH) various weights enhance strength system (E51/MTHPA). Among these, PEKC‐OH‐2 resin exhibited optimal at an addition level 10 phr, increasing from 11.85 23.46 kJ/m 2 , representing a 98% improvement, without compromising operating temperature mechanical properties Additionally, kilogram‐scale agent resins produced through scale‐up experiments 50‐L polymerization reactor, validating its applicability for industrial toughening. summary, PEKC‐OH synthesized study serves as efficient agent, offering ease preparation, producibility, considerable application potential. Highlights Novel (PEKC‐OH). Reactive improved with resin. formed interpenetrating network epoxy, boosting toughness. Scaled‐up reactor production. is feasible prepare has great prospect.

Language: Английский

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Thermo-Mechanical Properties and Phase-Separated Morphology of Warm-Mix Epoxy Asphalt Binders with Different Epoxy Resin Concentrations

Molecules, Journal Year: 2024, Volume and Issue: 29(14), P. 3251 - 3251

Published: July 9, 2024

The performance and phase-separated microstructures of epoxy asphalt binders greatly depend on the concentration resin or bitumen. In this paper, effect (ER) (10–90%) viscosity, thermo-mechanical properties, morphology warm-mix (WEABs) was investigated using Brookfield rotational viscometer, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) laser confocal microscopy (LSCM). Due to high reactivity resin, viscosity WEABs increases with time. Furthermore, initial decreases ER concentration. Depending concentration, viscosity–time behavior is divided into three stages: slow (10–40%), fast (50–80%), extremely (90%). stage, slightly while stage shows an opposite trend. DSC DMA results reveal that 10–80% exhibit two glass transition temperatures (Tgs) for cured Moreover, Tgs bitumen increase However, WEAB 90 % has only one Tg. LSCM observation phase separation occurs in all WEABs. For containing 10–40% ER, spherical particles act as discontinuous disperse continuous phase. 50–90% inversion takes place. Contrarily, damping properties phases crosslinking density occurrence a sharp tensile strength phases, elongation at break toughness first then A maximum value 70% ER.

Language: Английский

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Study on the micromorphologies and structural evolution in cold-mixed epoxy asphalt

Case Studies in Construction Materials, Journal Year: 2024, Volume and Issue: 21, P. e03512 - e03512

Published: July 9, 2024

Cold-mixed epoxy asphalt (CMEA) is a high performance paving material that can be constructed and cured at room temperature. It forms thermal mechanical performances during curing process. In this study, the phase state structural evolution characteristics of CMEA were evaluated by rheological behavior, properties, micromorphology. Viscosity tests dynamic analyses (DMA) applied to study tensile used determine properties. Moreover, fluorescence microscopy (FM), scanning electron (SEM) Fourier transform infrared spectroscopy (FTIR) implemented investigate micromorphological molecular structure evolution. The results showed reaction behavior was closely related viscosity–time curves satisfied Arrhenius equation above 45 ℃ followed linear trend low During CMEA, toughness increased in three stages: growth stage, stability stage decay stage. Furthermore, presence its solvent weakened asphalt. However, increasing temperature could increase group conversion rate. When complete, considerable amount mixed with uniformly distributed within three-dimensional network resin. This mixture adversely affected CMEA.

Language: Английский

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Optimizing Thermosetting Epoxy Asphalt with Styrene–Butadiene Rubber and Styrene–Butadiene–Styrene Modifiers for Enhanced Durability in Bridge Expansion Joints

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(24), P. 11842 - 11842

Published: Dec. 18, 2024

The high- and low-temperature performance of asphalt-based seamless expansion joints seriously affects road performance. purpose this paper is to explore the application thermosetting epoxy materials in bridge joints. composite modification asphalt was performed using Styrene–Butadiene rubber (SBR) Styrene–Butadiene–Styrene (SBS) copolymer. study then investigates impact five different dosages SBR/SBS-modified on asphalt. results cone penetration test, tensile stress relaxation test (SSEA) BJ200 (a commercial Seamless joint material) were comparatively analyzed. Marshall rutting three-point bending freeze–thaw split used evaluate SSEA mixtures. show that with increase content, shear resistance strength decrease, ability elongation at break increase. content has a positive effect mixtures, residual stability water splitting ratio (TSR) are higher than BJ200. Based requirement balancing high performance, SSEA-3 best overall dosage SBR SBS modifier 12% 2.5%, respectively. resin, asphalt, curing agent 1:4:1.6, its use recommended areas slight temperature differences.

Language: Английский

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