Non-destructive testing can aid aircraft refurbishing market absorb global pandemic shockwaves
Aviation Update|July 2020
Background - Non-destructive testing (NDT) can be represented as a set of aircraft inspection methods which spans a wide range of technologies, from analysis of 3D images of cracks, corrosion, dents in metals and composite materials to manual techniques like liquid penetrant and magnetic particle testing. With the adoption of composites and 3D-printed components in aircraft manufacturing, a requirement for testing the endurance of complex nomenclatures is being realized. NDT bridges this gap with its capability to access components down to the material levels. Some of the conventional NDT technologies are the following:
Avimanyu Basu
Non-destructive testing can aid aircraft refurbishing market absorb global pandemic shockwaves

Penetrant Testing (PT) and Magnetic Particle Testing (MT): Some of the conventional ways of detecting surface-breaking defects in metal and other nonporous materials are Penetrant testing (PT) and magnetic particle testing (MT). These NDT technologies have been used for decades but, with their own set of limitations in functionalities i.e. PT is capable of detecting only surface cracks and involves human intervention in handling chemicals, while MT is applicable on ferromagnetic materials alone. The other challenges for both methods include surface preparation and chemical disposal which are often timeconsuming even with a skilled inspector without the provision of a detailed digital record of the inspection results. In case of a hazardous or hard to reach area, further delay can be expected.

Ultrasonic Testing: In case of ultrasonic testing, the instruments and probes initiate high-frequency sound energy to detect defects such as porosities, delamination, and foreign particles in composites and anisotropies. The defects usually occur on the surface or within a layer of fibre or resin, often introduced during the materials fabrication. With immediate and precise results, along with a digital template that can share and store data, ultrasonic testing addresses some of the challenges encountered with PT or MT.

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