Void Formation
Void Formation - Related Videos
06:39
Real-Time Void Spot Assay
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Cited by 14 •
2023
This article describes a new method to study mouse voiding behavior by incorporating video monitoring in the conventional void spot assay. This approach provides temporal, spatial, and volumetric information on the voiding events and details of mouse behavior during the light and dark phases of the day.
01:12
Total Voids in Concrete
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2024
Total voids in concrete encompass gel water volume, capillary pores, and entrapped air. Gel water (retained within the cement hydration products) and physically entrapped or adsorbed water are significant for the hydration process. For complete hydration, it's estimated that the space needed for the products of a cubic centimeter of cement doubles. Capillary pores constitute the unoccupied space within the hydrated cement paste, with their size largely influenced by the water-to-cement ratio...
01:22
Imaging Studies VI: Voiding Cystourethrography and Cystography
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2025
Voiding Cystourethrography (VCUG) and Cystography are specialized radiographic procedures used to examine the structure and function of the bladder and urethra.Voiding Cystourethrography (VCUG)A Voiding Cystourethrogram (VCUG) is a diagnostic imaging procedure that assesses the anatomy and function of the lower urinary tract. It focuses on the bladder, bladder neck, and urethra, helping detect abnormalities such as vesicoureteral reflux (VUR)—the backward or reverse flow of urine into the...
01:31
Formation of Species
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2026
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
02:16
Solution Formation
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2020
There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride. This selective solubility...
FAQs
Void formation occurs when a manufacturing process fails to maintain continuous material filling or consolidation. Trapped gas can remain enclosed, while material shrinkage can leave unfilled regions as the structure develops. In welding, incomplete fusion interrupts continuity, and inadequate consolidation can preserve internal spaces in composites or other processed materials. These mechanisms provide direct targets for process optimization.
The effects of a void depend on how large it is, where it occurs, and how voids are distributed throughout the structure. These characteristics can reduce strength and stiffness, shorten fatigue life, alter fracture behavior, or increase fluid permeability. Consequently, engineers evaluate spatial patterns and critical locations rather than treating every internal space as equally harmful.
The underlying issue differs with the process that creates the structure. Casting may retain trapped gas or shrinkage-related spaces, welding may produce regions of incomplete fusion, and composite manufacture may suffer from inadequate consolidation. Additive manufacturing can also produce unfilled regions when continuity is not achieved. Comparing these mechanisms helps engineers connect observed defects with processing conditions.
Engineers use X-ray computed tomography and ultrasonic inspection as nondestructive evaluation methods, meaning they assess internal condition without damaging the component. These approaches support examination of void presence, size, distribution, and location within a material or structure. The resulting information helps relate internal features to expected mechanical performance and guides decisions about quality control or process improvement.
Void analysis gives engineers evidence for adjusting processing conditions and checking whether a process produces a sufficiently continuous structure. Measurements of defect size, distribution, and location can identify features associated with reduced strength, stiffness, fatigue life, fracture resistance, or fluid permeability. This information supports quality-control decisions and helps refine casting, welding, composite, or additive manufacturing practices.
Detected voids should be interpreted in relation to the component’s required mechanical performance and reliability. Their presence may affect load-bearing strength, stiffness, fatigue life, fracture behavior, or resistance to fluid passage. Engineers can combine nondestructive evaluation results with knowledge of void location and distribution to judge the significance of the condition and determine whether processing improvements are needed.