Which method is NOT a nondestructive testing method?

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Impact testing is recognized as a destructive testing method. This technique involves subjecting a material to a high-energy impact to observe its behavior, particularly how it absorbs energy and withstands fracturing. The primary purpose of impact testing is to determine the toughness and ductility of materials, as well as to establish the temperature at which a material transitions from ductile to brittle behavior. Because the test alters the material, it cannot be considered nondestructive.

In contrast, methods such as visual inspection, magnetic particle testing, and ultrasonic testing are all designed to evaluate the integrity and properties of materials without causing any damage. Visual inspection allows for the detection of surface flaws, while magnetic particle testing identifies surface and near-surface discontinuities in ferromagnetic materials using a magnetic field. Ultrasonic testing employs high-frequency sound waves to detect internal flaws, measuring the time it takes for the waves to return after bouncing off any discontinuities. These methods are valuable for quality control and ensuring safety without compromising the tested materials.

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