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Related Concept Videos

Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

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.
Plastic...
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Microcracking in Concrete

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...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Spanning Openings in Brick Walls

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...

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Related Experiment Video

Updated: May 11, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Star-shaped crack pattern of broken windows.

Nicolas Vandenberghe1, Romain Vermorel, Emmanuel Villermaux

  • 1Aix-Marseille Université, IRPHE, 13384 Marseille, France. vandenberghe@irphe.univ-mrs.fr

Physical Review Letters
|May 18, 2013
PubMed
Summary

Scientists studied how brittle plates fracture upon impact. They discovered a universal scaling law predicting the number of radial cracks based on impact speed, thickness, and material properties.

Area of Science:

  • Materials Science
  • Physics
  • Fracture Mechanics

Background:

  • Brittle plates, such as glass, fracture into radial crack patterns when impacted.
  • Understanding crack propagation is crucial for material analysis and failure prediction.

Purpose of the Study:

  • To investigate the relationship between impact parameters and the resulting crack patterns in brittle plates.
  • To establish a predictive model for the number of radial cracks formed.

Main Methods:

  • Controlled transverse impact experiments were conducted on brittle plates.
  • A wide range of impact speeds, plate thicknesses, and material properties were tested.
  • A fracture model integrating bending elastic and fracture energies was developed.

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Main Results:

  • A global scaling law was established, correlating crack number with impact parameters.
  • The experimental data aligned with the developed fracture model.
  • The number of radial cracks is predictable based on material properties and impact conditions.

Conclusions:

  • The study provides a comprehensive understanding of fracture patterns in brittle materials.
  • The developed scaling law and model offer insights into material behavior under impact.
  • Findings have implications for forensic science, archaeology, and astrophysics.