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Non Destructive Testing
Transcript of Non Destructive Testing
used on pyrotechnics, resins, plastics, organic material, honeycomb structures, radioactive material,
Used high density materials, and materials containing hydrogen access for placing test piece between source and detectors
size of neutron source housing is very large (reactors) for reasonable source strengths
collimating, filtering or otherwise modifying beam is difficult
cracks must be oriented parallel to beam for detection
sensitivity decreases with increasing thickness
have one of the worst safety profiles of the radiation professions, possibly because there are many operators using strong gamma sources (> 2 Ci) Advantages of Application Limitation Step Pre-cleaning
Application of Penetrant
Excess Penetrant Removal
Application of Developer
Post Cleaning Dye Penetrant Inspection Dye penetrant inspection (DPI) is inspection based upon capillary action, where low surface tension fluid penetrates into clean and dry surface-breaking discontinuities used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). What Is Non Destructive Testing ? It is a wide group of analysis techniques used in science and industry to evaluate the
properties of a material, component or system without causing damage.
Nondestructive examination (NDE), Nondestructive inspection (NDI), and
Nondestructive evaluation (NDE) are also commonly used to describe this technology. Eddy Current Inspection In an eddy current testing a circular coil carrying current is placed in proximity to the test specimen. It generates changing magnetic field which interacts with test specimen and generates eddy current. Graduate Mechanical Engineer Elvin Yusibov Type of NDT Eddy Current Inspection Dye Penetrant Inspection Radiogrhapic Testing Magnetic particle inspection Ultrasonic Testing Variations in the phase and magnitude of these eddy currents can be monitored using a second 'receiver' coil. Variations in the electrical will cause a change in eddy current and a corresponding change in the phase and amplitude of the measured current. Application metals, alloys and electroconductors
used on tubing, wire, bearings, rails,
surface and slightly subsurface flaws can be detected
aircraft components, turbine blades and disks, automotive transmission shafts Limitation requires customized probe
low penetration (typically 5mm)
false indications due to uncontrolled parametric variables
although non-contacting it requires close proximity of probe to part speed of the test
the low cost need access to test surface
defects must be surface breaking
decontamination & precleaning of test surface may be needed
very tight and shallow defects difficult to find
depth of flaw not indicated Magnetic particle inspection Type of magnetic inspection.. Magnetic particle inspection Magnetic particle inspection(MPI) is a non-destructive testing(NDT) process for detecting surface and slightly subsurface discontinuities in ferroelectric materials such asiron,nickel,cobalt, and some of their alloys Direct Magnetization
Indirect Magnetation There are several types of electrical currents used in MPI Alternating Current (AC) is commonly used to detect surface discontinuities.
Direct Current (DC,full wave DC) is used to detect subsurface discontinuities where AC can not penetrate deep enough to magnetize the part at the depth needed.
Half Wave DC(HWDC,pulsating DC) work similar to full wave DC, but allows for detection of surface breaking indications and has more magnetic penetration into the part than FWDC. Ultrasonic testing is often performed on steel and other metals and alloys, though it can also be used on concrete, wood and composites, albeit with less resolution. It is a form of non-destructive testing used in many industries including aerospace, automotive and other transportation sectors. There are two methods of receiving the ultrasound waveform :
Reflection: In this mode, the transducer performs both the sending and the receiving of the pulsed waves as the "sound" is reflected back to the device
Attenuation: In this mode, a transmitter sends ultrasound through one surface, and a separate receiver detects the amount that has reached it on another surface after traveling through the medium Attenuation method Reflection method Ultrasonic Testing Accoustic Emision Hologram Application Unlike conventional ultrasonic testing, AE tools are designed for monitoring acoustic emissions produced within the material during failure or stress, rather than actively transmitting waves, then collecting them after they have traveled through the material. The application of acoustic emission to non-destructive testing of materials in the ultrasonic regime, typically takes place between 100 kHz and 1 MHz. AE is commonly defined as transient elastic waves within a material, caused by the release of localized stress energy Member Member The HNDT techniques can be used for the testing of laminated structures, turbine blades, solid propellant rocket motor casings, tyres and air foils. These techniques are also useful in medical and dental research (cc) photo by theaucitron on Flickr (cc) photo by theaucitron on Flickr copy paste branches if you need more.... Holographic nondestructive testing techniques Optical holography is an imaging method, which records the amplitude and phase of light reflected from an object as an interferometric pattern on film. It thus allows reconstruction of the full 3-D image of the object Accoustic Emision to study the formation of cracks during the welding process, as opposed to locating them after the weld has been formed with the more familiar ultrasonic testing technique.
In a material under active stress, such as some components of an airplane during flight, transducers mounted in an area can detect the formation of a crack at the moment it begins propagating
The technique is also valuable for detecting cracks forming in pressure vessels and pipelines transporting liquids under high pressures. Also, this technique is used for estimation of corrosion in reinforced concrete structures Any Question Thank you for your attention! Ultrasonic Testing Magnetic Particle Testing Radiographic Testing Dry Penetrant Testing Eddy Current Testing