Microcracks

Microcracks are small fissures that form within biological tissues or medical materials and may signal early structural damage before a visible fracture develops. In bone, repeated mechanical loading can initiate microscopic cracks; bone-remodeling cells normally remove damaged tissue and replace it, but excessive loading or impaired repair can allow cracks to accumulate and weaken the skeleton. Studying microcracks supports the assessment of stress injuries, osteoporosis-related fragility, dental damage, and the durability of orthopedic implants. Microscopy, imaging, mechanical testing, and computational modeling help researchers detect these defects, clarify their progression, and improve diagnosis, prevention, and device design.

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JoVE Core - Civil Engineering

Microcracking in Concrete

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2024

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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