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01:20Microcracking in Concrete
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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...
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01:28Types of Non-structural Cracks in Concrete
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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 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.
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Path (un)predictability of two interacting cracks in polycarbonate sheets using Digital Image Correlation.
J Koivisto1, M-J Dalbe2,3,4, M J Alava1
1Aalto University, Department of Applied Physics, PO Box 14100, 00076 Aalto, Finland.
Scientific Reports
|September 1, 2016
Summary
Digital Image Correlation tracked crack propagation in polycarbonate. Complex crack paths, including repulsion and attraction, result from local symmetry principles and material properties, making long-range prediction difficult.
Area of Science:
- Materials Science
- Fracture Mechanics
Background:
- Polycarbonate exhibits high ductility and a large Fracture Process Zone (FPZ).
- Understanding crack interaction is crucial for predicting material failure.
Purpose of the Study:
- To analyze the complex crack paths of two opposing cracks in polycarbonate.
- To elucidate the underlying principles governing crack interaction and propagation.
Main Methods:
- Digital Image Correlation (DIC) was employed to track crack propagation.
- Strain field analysis was performed to understand crack behavior.
Main Results:
- Observed complex crack paths, including initial repulsion followed by attraction between cracks.
- Demonstrated that crack propagation aligns with the principle of local symmetry, where shear mode (KII) is zero.
- Attributed crack interactions to symmetry, initial geometry, and material properties (FPZ).
Conclusions:
- Crack interactions in ductile materials are governed by local symmetry principles.
- The complex interplay of geometry and material properties complicates long-range crack path prediction.
- DIC analysis provides valuable insights into crack propagation dynamics in materials with large FPZs.