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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

218
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
218
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

251
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
251
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

196
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
196
Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

272
Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
272
Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

466
Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
466
Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

14.4K
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
14.4K

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相关实验视频

Updated: Sep 19, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

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柔性YOLO:一种轻量级的方法,用于复杂环境中的道路裂检测.

Jiexiang Yang1, Renjie Tian2, Zexing Zhou1

  • 1School of Information Science and Engineering, Chongqing Jiaotong University, Chongqing, China.

PloS one
|June 16, 2025
PubMed
概括

这项研究介绍了Flexi-YOLO,这是一款用于准确检测道路裂的新型轻量级模型. 它显著提高了检测准确性和稳定性,满足了对实时应用的工业需求.

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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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相关实验视频

Last Updated: Sep 19, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

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科学领域:

  • 计算机视觉 计算机视觉
  • 人工智能的人工智能
  • 土木工程 土木工程是指土木工程.

背景情况:

  • 道路裂检测对于基础设施维护和公共安全至关重要.
  • 复杂的背景和裂纹模式对当前的检测方法构成挑战.
  • 现有的模型经常在实时,高效和准确的检测方面扎.

研究的目的:

  • 为有效和准确的道路裂检测提出一个轻量级和坚固的模型.
  • 提高基础设施监控对象检测算法的性能.
  • 解决当前处理复杂裂特征和环境的方法的局限性.

主要方法:

  • 开发了Flexi-YOLO,这是一个基于YOLOv8算法的轻量级模型.
  • 集成的Wise-IoU损失功能,用于改进边界框回归和样本稳定性.
  • 集成的DCNv-C2f模块用于自适应特征转换和融合.
  • 利用全球注意力模块 (GAM) 和AKConv来增强全球和本地特征感知.
  • 实现了一个轻量级的G-Head (Ghost-Head) 检测头,以减少功能冗余.

主要成果:

  • 与YOLOv8n.相比,Flexi-YOLO实现了2.7%的精度增加和4.7%的召回增加.
  • mAP提高了5.3%和mAP@0.5-0.95提高了3.9%.
  • 将GFLOPS降低了0.5,并将F1得分从0.80提高到0.84.
  • 对低质量的样品和复杂的裂纹图案表现出增强的稳定性.

结论:

  • Flexi-YOLO 为自动化道路裂检测提供了一个高度准确和强大的解决方案.
  • 该模型的轻量级设计符合实时处理和成本效益的工业要求.
  • 这种方法为基础设施维护和公共安全应用提供了显著的改进.