What is a non -destructive assessment?

Non -destructive evaluation is any diagnostic process for control of parts or equipment that does not require part to be damaged or destroyed by the test. Buildings, bridges or pipes require routine inspections and cannot be disassembled or damaged when determining their condition. The use of a non -destructive test allows you to examine both visible and hidden defects and the results can be used to determine whether further repairs are needed. Since the mid -20th century, high -frequency sounds have been used high -frequency or ultrasounds to find hidden defects in metal or brick structures. Ultrasonic sound waves enter the controlled parts into a specific depth depending on the material and the monitor can view the reflected sound image. With discouraging sound waves you can see cracks in steel beams, structural parts of the aircraft or even hidden defects in the human organs.

Another non -destructive assessment is an X -ray display where part is exposed to the radiation beam whoThe rice leaves a picture on a film similar to a photo. X -rays can penetrate the solid materials or human body and show hidden damage without having to open a structure or surgically detect part of the body. These tests are often used on bridges where structural damage is suspected, but is not visible, and the bridge cannot be removed from operation when testing. Repeated X -ray exposures can cause cells damage in humans and animals, but routine exposures are considered non -destructive.

Testing the penetration of dyes can be used to find very fine cracks in metals. This non -destructive evaluation is often used in aircraft metal testing and does not cause any damage or chemical changes in aluminum parts. The dye enters cracks, making it visible to the eye. In some cases, dyes can be used to shine when exposed to ultraviolet light.

Eddy Current Testing is another non -destructive evaluation of methods that uses small electric currents produced by a magnetic field to find hidden structural defects. These tests will only work on metals that can perform electric current, and are often used on steel structures and pipes. The electric coil is located near the building to be tested, and the alternating current passing through the coil creates a magnetic field that produces small electrical whirlpools in the test part. Another coil acts as a receiver and allows changes in the whirlpool to measure and see on the monitor.

voltage testing is a non -destructive evaluation that uses small electronic meters located on the test parts. These meters measure small changes in dimension or shape of part caused by load and tension. The deformation meters do not cause any damage to the parts, but require parts to be clean to allow them to be glued in place. Testing with voltage meters must occur after longerTime because the voltage occurs slowly and changes may not be displayed by imdetives. You can use wireless systems that will send signals to computers outside the data storage workplace, allowing measuring to remain in place without the need for human monitoring.