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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

111
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...
111
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

150
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
150
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

171
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
171
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

272
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
272
Shearing Strain01:20

Shearing Strain

235
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
235

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相关实验视频

Updated: Jun 13, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
07:37

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

Published on: January 16, 2019

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在压缩下使用数字图像关联方法和数值模拟在双缺陷花岩中的裂纹传播过程.

Zhiqiang Hou1,2, Ruifu Yuan3,4, Yan Chen3,4

  • 1School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan, China. houzq@hpu.edu.cn.

Scientific reports
|September 13, 2024
PubMed
概括
此摘要是机器生成的。

缺陷显著降低了岩石的强度,并改变了裂纹模式. 在花岩标本中增加缺陷角度提高了故障强度,并改变了断裂模式,这对于了解岩石结构稳定性至关重要.

关键词:
数字图像的相关性相关性这是双重缺陷.骨折形态学 骨折形态学 骨折形态学这是宏观裂.粒子流代码 (PFC) 是指粒子流代码.

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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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:

  • 地质技术工程 地质技术工程
  • 岩石机械学 岩石机械学
  • 材料科学 材料科学 材料科学

背景情况:

  • 缺陷严重损害岩石质量的强度,影响裂传播,影响整体斜坡稳定性.
  • 了解缺陷几何效应对于预测工程应用中的岩石行为至关重要.

研究的目的:

  • 调查缺陷角度对双缺陷花岩样本的压力强度和裂凝聚力的影响.
  • 通过数字图像相关 (DIC) 和粒子流代码 (PFC2D) 模拟来分析裂纹的启动和传播.

主要方法:

  • 在具有不同缺陷角度 (15°,30°,45°,60°) 的双缺陷花岩样本上进行单轴压缩试验.
  • 数字图像关联 (DIC) 技术用于观察裂的开始,传播和应变模式.
  • 粒子流代码2D (PFC2D) 数值模拟以验证实验发现.

主要成果:

  • 在有缺陷的标本中,与完整的标本相比,单轴压力 (UCS) 降低了25.5-51.7%.
  • 断裂强度随着缺陷倾斜角度的增加而增加,断裂形态从没有扩张过渡到分裂扩张.
  • 当缺陷尖端应变超过0.6%时,宏观裂开始发生,在缺陷尖端观察到应力度.

结论:

  • 缺陷倾斜显著影响岩石强度和故障机制,DIC和PFC2D提供了宝贵的见解.
  • 岩石质量变形包括材料和结构部件,受缺陷特征的影响.
  • 这些发现提高了对有缺陷的岩石裂行为的理解,这对于民用和采矿工程项目的稳定性分析至关重要.