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Related Concept Videos

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

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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...
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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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...
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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...
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Updated: Jun 13, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Crack propagation process in double-flawed granite under compression using digital image correlation method and

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
Summary
This summary is machine-generated.

Flaws significantly reduce rock strength and alter crack patterns. Increasing flaw angles in granite specimens enhances failure strength and shifts fracture modes, crucial for understanding rock structure stability.

Keywords:
Digital image correlationDouble flawsFracture morphologyMacrocracksParticle flow code (PFC)

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Area of Science:

  • Geotechnical Engineering
  • Rock Mechanics
  • Materials Science

Background:

  • Flaws critically compromise rock mass strength and influence crack propagation, impacting overall slope stability.
  • Understanding flaw geometry effects is vital for predicting rock behavior in engineering applications.

Purpose of the Study:

  • To investigate the influence of flaw angle on the compressive strength and crack coalescence of double-flawed granite specimens.
  • To analyze crack initiation and propagation using digital image correlation (DIC) and particle flow code (PFC2D) simulations.

Main Methods:

  • Uniaxial compression tests on double-flawed granite specimens with varying flaw angles (15°, 30°, 45°, 60°).
  • Digital Image Correlation (DIC) technology to observe crack initiation, propagation, and strain patterns.
  • Particle Flow Code 2D (PFC2D) numerical simulations to validate experimental findings.

Main Results:

  • Uniaxial Compressive Strength (UCS) decreased by 25.5-51.7% in flawed specimens compared to intact ones.
  • Failure strength increased with flaw inclination angle, with fracture morphology transitioning from no expansion to split expansion.
  • Macroscopic cracks initiated when flaw tip strain exceeded 0.6%, with stress concentrations observed at flaw tips.

Conclusions:

  • Flaw inclination significantly affects rock strength and failure mechanisms, with DIC and PFC2D providing valuable insights.
  • Rock mass deformation comprises both material and structural components, influenced by flaw characteristics.
  • Findings enhance the understanding of crack behavior in flawed rocks, crucial for stability analyses in civil and mining engineering projects.