Non-destructive Testing
Non-destructive Testing - Related Videos
01:12
Non-destructive Tests for Concrete Strength
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2024
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...
11:34
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Cited by 7 •
2017
This method aims at locating vertical subsurface defects. Here, we couple a laser with a spatial light modulator and trigger its video input to heat a sample surface deterministically with two anti-phased modulated lines while acquiring highly resolved thermal images. The defect position is retrieved from evaluating thermal wave interference minima.
08:24
Introduction to the Ultrasound Targeted Microbubble Destruction Technique
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Cited by 19 •
2011
Ultrasound Targeted Microbubble Destruction (UTMD) can be used to direct site-specific delivery of bioactive molecules, including therapeutic genes, to target organs accessible to ultrasound, such as the heart and liver1-6.
08:08
Compression Tests on Hardened Concrete
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA There are two distinct stages in a construction project involving concrete. The first stage involves batching, transporting, and casting fresh concrete. At this stage, the material is viscous, and the workability and finishability are the key performance criteria. The second stage occurs when the hydration process begins shortly after the concrete is placed in the form, and the concrete will...
09:24
Application and Methodology of the Non-destructive 19F Time-domain NMR Technique to Measure the Content in Fluorine-containing Drug Products
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Cited by 2 •
2017
A simple and non-destructive technique that measures the average content of drug substances in formulated drug products containing fluorine using low-field fluorine-19 (19F) time-domain (TD) nuclear magnetic resonance (NMR) is presented here. The technique can be applied to the development and manufacturing of drugs in the pharmaceutical industry.
FAQs
Each method uses a different physical response to make a discontinuity visible. Ultrasonic testing sends sound waves through a component, radiographic testing uses radiation, magnetic particle testing uses magnetic fields, liquid penetrant testing relies on penetrant flow, and visual inspection examines reflected light. Matching the signal to the flaw being investigated helps engineers inspect components while preserving their usability.
Signal behavior determines what an inspection can reveal. Sound waves, radiation, magnetic fields, penetrant flow, and reflected light interact with materials and discontinuities in different ways, so the methods provide complementary views rather than identical information. This distinction matters in engineering quality control and maintenance, where selecting an appropriate technique supports more reliable judgments about a component’s condition.
Destructive sampling requires sacrificing or altering the test piece, whereas NDT preserves the usefulness of the inspected object. That preservation allows inspection to support manufacturing quality control, maintenance, and structural safety without requiring a component to be sacrificed for examination. Engineers can therefore evaluate materials, components, and structures while limiting waste, downtime, and inspection-related cost.
An engineering inspection begins with an object or structure selected for examination, followed by application of an appropriate NDT method. The inspector then observes the relevant physical response, such as sound, radiation, magnetic effects, penetrant indications, or visible features, to identify discontinuities. The resulting information supports decisions about quality, condition, performance, or service life.
Applications span aerospace, civil, mechanical, and energy engineering. In manufacturing, NDT supports quality control by helping identify flaws in components; during maintenance, it helps assess the condition of structures and equipment; and in structural safety work, it informs decisions about performance and service life. Its value is greatest when preserving the inspected object matters.
It can reveal discontinuities, cracks, corrosion, and other flaws while leaving the tested object useful for its intended role. That information helps engineers judge whether a material, component, or structure meets quality expectations, requires maintenance attention, or may affect performance and service life. The outcome is decision support for engineering action rather than destructive sampling itself.