Crack Growth
Crack Growth - Related Videos
13:10
Antibody Staining in C. Elegans Using "Freeze-Cracking"
0 Views •
Cited by 34 •
2013
"Freeze-cracking," a method for exposing the inner tissues of the nematode C. elegans to antibodies for protein localization, is demonstrated.
11:33
Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
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Cited by 3 •
2016
This paper presents an experimental method to produce biofuels and biochemicals from canola oil mixed with a fossil-based feed in the presence of a catalyst at mild temperatures. Gaseous, liquid, and solid products from a reaction unit are quantified and characterized. Conversion and individual product yields are calculated and reported.
02:56
Freeze-Cracking of Nematodes: A Method to Expose Interior Worm Tissues for Staining
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2023
This video describes freeze-cracking, a method to make C. elegans tissues accessible for antibody staining by disrupting the cuticle.
01:28
Types of Non-structural Cracks in Concrete
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2024
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...
04:58
Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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Cited by 7 •
2023
In this study, a protocol is presented that describes the use of mechanoluminescent (ML) visualization for monitoring crack propagation and mechanical behavior during adhesive joint evaluation testing.
FAQs
The crack tip creates a local stress concentration, so the material near that tip experiences intensified loading rather than only the nominal applied load. This concentration drives local deformation and can promote rupture at the advancing front. In engineering assessments, crack-tip behavior therefore provides the basis for evaluating structural safety and service life.
Repeated loading can cause fatigue crack growth when the stress-intensity factor changes during each loading cycle. These changes repeatedly load the crack tip, allowing the flaw to extend progressively over time. Engineers therefore relate measured growth rates to the loading conditions to determine how cyclic service may affect a component’s usable life.
An overload can produce rapid, unstable crack propagation when the material’s fracture resistance is exceeded. This behavior differs from the progressive extension associated with repeated loading, where growth is tracked through changes in stress-intensity factor. Recognizing the distinction helps engineers evaluate whether a component is undergoing manageable damage accumulation or an immediate loss of fracture resistance.
Crack-growth rates depend on the applied loading conditions and the material properties governing resistance to fracture. Changes in loading determine the stress-intensity conditions at the crack, while material behavior affects how readily deformation and rupture occur. Evaluating both factors allows engineers to connect observed extension with structural performance rather than treating crack length alone as the complete assessment.
Engineers measure how quickly a crack extends, then relate that growth rate to the relevant loading conditions and material properties. This approach connects observed damage progression with the conditions experienced by the component. The resulting information supports engineering judgments about structural safety, expected service life, and the need for continued assessment.
Crack-growth information supports damage-tolerant design by showing how an existing flaw may progress under service loading. Engineers use these relationships to estimate remaining life and establish inspection intervals before the damage reaches a critical condition. The approach helps safety assessments account for flaws and their progression rather than assuming that components remain defect-free.
Crack-growth assessment is relevant to aircraft, bridges, pressure vessels, and other critical components exposed to applied loading during service. In these settings, engineers use growth rates, loading conditions, and material properties to support safety decisions. The analysis can guide remaining-life predictions and inspection planning where undetected damage could compromise continued operation.