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AEROSPACE - NDT

Nondestructive Inspection (NDI) of Composites

Visual Inspection

A visual inspection is the primary inspection method for in-service inspections. Most types of damage scorch, stain, dent, penetrate, abrade, or chip the composite surface, making the damage visible. Once damage is detected, the affected area needs to be inspected closer using flashlights, magnifying glasses, mirrors, and borescopes. These tools are used to magnify defects that otherwise might not be seen easily and to allow visual inspection of areas that are not readily accessible. Resin starvation, resin richness, wrinkles, ply bridging, discoloration (due to overheating, lightning strike, etc.), impact damage by any cause, foreign matter, blisters, and disbonding are some of the discrepancies that can be detected with a visual inspection. Visual inspection cannot find internal flaws in the composite, such as delaminations, disbonds, and matrix crazing. More sophisticated NDI techniques are needed to detect these types of defects.

Audible Sonic Testing (Coin Tapping)

Sometimes referred to as audio, sonic, or coin tap, this technique makes use of frequencies in the audible range (10Hz to 20 Hz). A surprisingly accurate method in the hands of experienced personnel, tap testing is perhaps the most common technique used for the detection of delamination and/or disbond. The method is accomplished by tapping the inspection area with a solid round disk or lightweight hammer-like device and listening to the response of the structure to the hammer. A clear, sharp, ringing sound is indicative of a well-bonded solid structure, while a dull or thud-like sound indicates a discrepant area.

The tapping rate needs to be rapid enough to produce enough sound for any difference in sound tone to be discernable to the ear. Tap testing is effective on thin skin to stiffener bondlines, honeycomb sandwich with thin face sheets, or even near the surface of thick laminates, such as rotorcraft blade supports. Again, inherent in the method is the possibility that changes within the internal elements of the structure might produce pitch changes that are interpreted as defects, when in fact they are present by design. This inspection should be accomplished in as quiet an area as possible and by experienced personnel familiar with the part’s internal configuration. This method is not reliable for structures with more than four plies. It is often used to map out the damage on thin honeycomb facesheets.

Automated Tap Test

This test is very similar to the manual tap test except that a solenoid is used instead of a hammer. The solenoid produces multiple impacts in a single area. The tip of the impactor has a transducer that records the force versus time signal of the impactor. The magnitude of the force depends on the impactor, the impact energy, and the mechanical properties of the structure. The impact duration (period) is not sensitive to the magnitude of the impact force; however, this duration changes as the stiffness of the structure is altered. Therefore, the signal from an unflawed region is used for calibration, and any deviation from this unflawed signal indicates the existence of damage.

Ultrasonic Inspection

Ultrasonic inspection has proven to be a very useful tool for the detection of internal delaminations, voids, or inconsistencies in composite components not otherwise discernable using visual or tap methodology. There are many ultrasonic techniques; however, each technique uses sound wave energy with a frequency above the audible range. A high-frequency (usually several MHz) sound wave is introduced into the part and may be directed to travel normal to the part surface, or along the surface of the part, or at some predefined angle to the part surface. You may need to try different directions to locate the flow. The introduced sound is then monitored as it travels its assigned route through the part for any significant change. Ultrasonic sound waves have properties similar to light waves. When an ultrasonic wave strikes an interrupting object, the wave or energy is either absorbed or reflected back to the surface. The disrupted or diminished sonic energy is then picked up by a receiving transducer and converted into a display on an oscilloscope or a chart recorder. The display allows the operator to evaluate the discrepant indications comparatively with those areas known to be good. To facilitate the comparison, reference standards are established and utilized to calibrate the ultrasonic equipment.

The repair technician must realize that the concepts outlined here work fine in the repetitious manufacturing environment, but are likely to be more difficult to implement in a repair environment given the vast number of different composite components installed on the aircraft and the relative complexity of their construction. The reference standards would also have to take into account the transmutations that take place when a composite component is exposed to an in-service environment over a prolonged period or has been the subject of repair activity or similar restorative action. The four most common ultrasonic techniques are discussed next.

Through Transmission Ultrasonic Inspection

Through transmission ultrasonic inspection uses two transducers, one on each side of the area to be inspected. The ultrasonic signal is transmitted from one transducer to the other transducer. The loss of signal strength is then measured by the instrument. The instrument shows the loss as a percent of the original signal strength or the loss in decibels. The signal loss is compared to a reference standard. Areas with a greater loss than the reference standard indicate a defective area.

Pulse Echo Ultrasonic Inspection

Single-side ultrasonic inspection may be accomplished using pulse echo techniques. In this method, a single search unit is working as a transmitting and a receiving transducer that is excited by high voltage pulses. Each electrical pulse activates the transducer element. This element converts the electrical energy into mechanical energy in the form of an ultrasonic sound wave. The sonic energy travels through a Teflon® or methacrylate contact tip into the test part. A waveform is generated in the test part and is picked up by the transducer element. Any change in amplitude of the received signal, or time required for the echo to return to the transducer, indicates the presence of a defect. Pulse echo inspections are used to find delaminations, cracks, porosity, water, and disbonds of bonded components. Pulse echo does not find disbonds or defects between laminated skins and honeycomb core.

Phased Array Inspection

Phased array inspection is one of the latest ultrasonic instruments to detect flaws in composite structures. It operates under the same principle of operation as pulse echo, but it uses 64 sensors at the same time, which speeds up the process.

Ultrasonic Bondtester Inspection

Low-frequency and high-frequency bondtesters are used for ultrasonic inspections of composite structures. These bondtesters use an inspection probe that has one or two transducers. The high-frequency bondtester is used to detect delaminations and voids. It cannot detect a skin-to-honeycomb core disbond or porosity. It can detect defects as small as 0.5-inch in diameter. The low-frequency bondtester uses two transducers and is used to detect delamination,

Radiography

Radiography, often referred to as X-ray, is a very useful NDI method because it essentially allows a view into the interior of the part. This inspection method is accomplished by passing X-rays through the part or assembly being tested while recording the absorption of the rays onto a film sensitive to X-rays. The exposed film, when developed, allows the inspector to analyze variations in the opacity of the exposure recorded onto the film, in effect creating a visualization of the relationship of the component’s internal details. Since the method records changes in total density through its thickness, it is not a preferred method for detecting defects such as delaminations that are in a plane that is normal to the ray direction. It is a most effective method, however, for detecting flaws parallel to the X-ray beam’s centerline. Internal anomalies, such as delaminations in the corners, crushed core, blown core, water in core cells, voids in foam adhesive joints, and relative position of internal details, can readily be seen via radiography. Most composites are nearly transparent to X-rays, so low energy rays must be used. Because of safety concerns, it is impractical to use around aircraft. Operators should always be protected by sufficient lead shields, as the possibility of exposure exists either from the X-ray tube or from scattered radiation. Maintaining a minimum safe distance from the X-ray source is always essential.

Thermography

Thermal inspection comprises all methods in which heat-sensing devices are used to measure temperature variations for parts under inspection. The basic principle of thermal inspection consists of measuring or mapping of surface temperatures when heat flows from, to, or through a test object. All thermographic techniques rely on differentials in thermal conductivity between normal, defect free areas, and those having a defect. Normally, a heat source is used to elevate the temperature of the part being examined while observing the surface heating effects. Because defect free areas conduct heat more efficiently than areas with defects, the amount of heat that is either absorbed or reflected indicates the quality of the bond. The type of defects that affect the thermal properties include debonds, cracks, impact damage, panel thinning, and water ingress into composite materials and honeycomb core. Thermal methods are most effective for thin laminates or for defects near the surface.

Neutron Radiography

Neutron radiography is a nondestructive imaging technique that is capable of visualizing the internal characteristics of a sample. The transmission of neutrons through a medium is dependent upon the neutron cross sections for the nuclei in the medium. Differential attenuation of neutrons through a medium may be measured, mapped, and then visualized.

Moisture Detector

A moisture meter can be used to detect water in sandwich honeycomb structures. A moisture meter measures the RF power loss caused by the presence of water. The moisture meter is often used to detect moisture in nose radomes.

COMMON METHODS

Liquid penetrant (PT)
Magnetic particle (MT)
Eddy current (ET)
Ultrasonic (UT)
Radiography (RT)
Thermography (IRT)
Shearography (ST)

OTHER METHODS

When invoked by engineering, quality, cognizant engineering organization or prime contractor requirements, this standard applies to other current and emerging NDT methods used to determine the acceptability or suitability for intended service of a material, part, component, sub-assembly or assembly. Such methods may include, but are not limited to, acoustic emission, neutron radiography, leak testing and holography. The requirements for personnel training, experience, and examination for these other methods shall be established in accordance with paragraph 6.4 and shall be documented by the employer.

The introduction of new NDT methods is when the resources of a NANDTB would be most useful to an employer.

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Australia, ndt Traininginstitute,training, institute, course in Austria, ndt Traininginstitute,training, institute, course in Azerbaijan, ndt Traininginstitute,training, institute, course in Bahamas, The, ndt Traininginstitute,training, institute, course in Bahrain, ndt Traininginstitute,training, institute, course in Bangladesh, ndt Traininginstitute,training, institute, course in Barbados, ndt Traininginstitute,training, institute, course in Bassas da ndt traininginstitute,training, institute, course india ndt Traininginstitute,training, institute, course in Belarus, ndt Traininginstitute,training, institute, course in Belgium, ndt Traininginstitute,training, institute, course in Belize, ndt Traininginstitute,training, institute, course in Benin, ndt Traininginstitute,training, institute, course in Bermuda, ndt Traininginstitute,training, institute, course in Bhutan, ndt Traininginstitute,training, institute, course in Bolivia, ndt Traininginstitute,training, institute, course in Bosnia and Herzegovina, ndt Traininginstitute,training, institute, course in Botswana, ndt Traininginstitute,training, institute, course in Bouvet Island, ndt Traininginstitute,training, institute, course in Brazil, ndt Traininginstitute,training, institute, course in British Indian Ocean Territory ndt Traininginstitute,training, institute, course in British Virgin Islands ndt Traininginstitute,training, institute, course in Brunei ndt Traininginstitute,training, institute, course in Bulgaria ndt Traininginstitute,training, institute, course in Burkina Faso ndt Traininginstitute,training, institute, course in Burma ndt Traininginstitute,training, institute, course in Burundi ndt Traininginstitute,training, institute, course in Cambodia ndt Traininginstitute,training, institute, course in Cameroon ndt Traininginstitute,training, institute, course in Canada ndt Traininginstitute,training, institute, course in Cape Verde ndt Traininginstitute,training, institute, course in Cayman Islands ndt Traininginstitute,training, institute, course in Central African Republic ndt Traininginstitute,training, institute, course in Chad ndt Traininginstitute,training, institute, course in Chile ndt Traininginstitute,training, institute, course in China ndt Traininginstitute,training, institute, course in Christmas Island ndt Traininginstitute,training, institute, course in Clipperton Island ndt Traininginstitute,training, institute, course in Cocos (Keeling) Islands ndt Traininginstitute,training, institute, course in Colombia ndt Traininginstitute,training, institute, course in Comoros ndt Traininginstitute,training, institute, course in Congo, Democratic Republic of the ndt Traininginstitute,training, institute, course in Congo, Republic of the ndt Traininginstitute,training, institute, course in Cook Islands ndt Traininginstitute,training, institute, course in Coral Sea Islands ndt Traininginstitute,training, institute, course in Costa Rica ndt Traininginstitute,training, institute, course in Cote d'Ivoire ndt Traininginstitute,training, institute, course in Croatia ndt Traininginstitute,training, institute, course in Cuba ndt Traininginstitute,training, institute, course in Cyprus ndt Traininginstitute,training, institute, course in Czech Republic ndt Traininginstitute,training, institute, course in Denmark ndt Traininginstitute,training, institute, course in Dhekelia ndt Traininginstitute,training, institute, course in Djibouti ndt Traininginstitute,training, institute, course in Dominica ndt Traininginstitute,training, institute, course in Dominican Republic ndt Traininginstitute,training, institute, course in Ecuador ndt Traininginstitute,training, institute, course in Egypt ndt Traininginstitute,training, institute, course in El Salvador ndt Traininginstitute,training, institute, course in Equatorial Guinea ndt Traininginstitute,training, institute, course in Eritrea ndt Traininginstitute,training, institute, course in Estonia ndt Traininginstitute,training, institute, course in Ethiopia ndt Traininginstitute,training, institute, course in Europa Island ndt Traininginstitute,training, institute, course in Falkland Islands (Islas Malvinas) ndt Traininginstitute,training, institute, course in Faroe Islands ndt Traininginstitute,training, institute, course in Fiji ndt Traininginstitute,training, institute, course in Finland ndt Traininginstitute,training, institute, course in France ndt Traininginstitute,training, institute, course in French Guiana ndt Traininginstitute,training, institute, course in French Polynesia ndt Traininginstitute,training, institute, course in French Southern and Antarctic Lands ndt Traininginstitute,training, institute, course in Gabon ndt Traininginstitute,training, institute, course in Gambia, The ndt Traininginstitute,training, institute, course in Gaza Strip ndt Traininginstitute,training, institute, course in Georgia ndt Traininginstitute,training, institute, course in Germany ndt Traininginstitute,training, institute, course in Ghana ndt Traininginstitute,training, institute, course in Gibraltar ndt Traininginstitute,training, institute, course in Glorioso Islands ndt Traininginstitute,training, institute, course in Greece ndt Traininginstitute,training, institute, course in Greenland ndt Traininginstitute,training, institute, course in Grenada ndt Traininginstitute,training, institute, course in Guadeloupe ndt Traininginstitute,training, institute, course in Guam ndt Traininginstitute,training, institute, course in Guatemala ndt Traininginstitute,training, institute, course in Guernsey ndt Traininginstitute,training, institute, course in Guinea ndt Traininginstitute,training, institute, course in Guinea-Bissau ndt Traininginstitute,training, institute, course in Guyana ndt Traininginstitute,training, institute, course in Haiti ndt Traininginstitute,training, institute, course in Heard Island and McDonald Islands ndt Traininginstitute,training, institute, course in Holy See (Vatican City) ndt Traininginstitute,training, institute, course in Honduras ndt Traininginstitute,training, institute, course in Hong Kong ndt Traininginstitute,training, institute, course in Hungary ndt Traininginstitute,training, institute, course in Iceland ndt Traininginstitute,training, institute, course india ndt Traininginstitute,training, institute, course indonesia ndt Traininginstitute,training, institute, course in Iran ndt Traininginstitute,training, institute, course in Iraq ndt Traininginstitute,training, institute, course in Ireland ndt Traininginstitute,training, institute, course in Isle of Man ndt Traininginstitute,training, institute, course in Israel ndt Traininginstitute,training, institute, course in Italy ndt Traininginstitute,training, institute, course in Jamaica ndt Traininginstitute,training, institute, course in Jan Mayen ndt Traininginstitute,training, institute, course in Japan ndt Traininginstitute,training, institute, course in Jersey ndt Traininginstitute,training, institute, course in Jordan ndt Traininginstitute,training, institute, course in Juan de Nova Island ndt Traininginstitute,training, institute, course in Kazakhstan ndt Traininginstitute,training, institute, course in Kenya ndt Traininginstitute,training, institute, course in Kiribati ndt Traininginstitute,training, institute, course in Korea, North ndt Traininginstitute,training, institute, course in Korea, South ndt Traininginstitute,training, institute, course in Trivandrum, kerala ndt Traininginstitute,training, institute, course in Kyrgyzstan ndt Traininginstitute,training, institute, course in Laos ndt Traininginstitute,training, institute, course in Latvia ndt Traininginstitute,training, institute, course in Lebanon ndt Traininginstitute,training, institute, course in Lesotho ndt Traininginstitute,training, institute, course in Liberia ndt Traininginstitute,training, institute, course in Libya ndt Traininginstitute,training, institute, course in Liechtenstein ndt Traininginstitute,training, institute, course in Lithuania ndt Traininginstitute,training, institute, course in Luxembourg ndt Traininginstitute,training, institute, course in Macau ndt Traininginstitute,training, institute, course in Macedonia ndt Traininginstitute,training, institute, course in Madagascar ndt Traininginstitute,training, institute, course in Malawi ndt Traininginstitute,training, institute, course in Malaysia ndt Traininginstitute,training, institute, course in Maldives ndt Traininginstitute,training, institute, course in Mali ndt Traininginstitute,training, institute, course in Malta ndt Traininginstitute,training, institute, course in Marshall Islands ndt Traininginstitute,training, institute, course in Martinique ndt Traininginstitute,training, institute, course in Mauritania ndt Traininginstitute,training, institute, course in Mauritius ndt Traininginstitute,training, institute, course in Mayotte ndt Traininginstitute,training, institute, course in Mexico ndt Traininginstitute,training, institute, course in Micronesia, Federated States of ndt Traininginstitute,training, institute, course in Moldova ndt Traininginstitute,training, institute, course in Monaco ndt Traininginstitute,training, institute, course in Mongolia ndt Traininginstitute,training, institute, course in Montserrat ndt Traininginstitute,training, institute, course in Morocco ndt Traininginstitute,training, institute, course in Mozambique ndt Traininginstitute,training, institute, course in Namibia ndt Traininginstitute,training, institute, course in Nauru ndt Traininginstitute,training, institute, course in Navassa Island ndt Traininginstitute,training, institute, course in Nepal ndt Traininginstitute,training, institute, course in Netherlands ndt Traininginstitute,training, institute, course in Netherlands Antilles ndt Traininginstitute,training, institute, course in New Caledonia ndt Traininginstitute,training, institute, course in New Zealand ndt 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course in Philippines ndt Traininginstitute,training, institute, course in Pitcairn Islands ndt Traininginstitute,training, institute, course in Poland ndt Traininginstitute,training, institute, course in Portugal ndt Traininginstitute,training, institute, course in Puerto Rico ndt Traininginstitute,training, institute, course in Qatar ndt Traininginstitute,training, institute, course in Reunion ndt Traininginstitute,training, institute, course in RTrivandrum, keralaia ndt Traininginstitute,training, institute, course in Russia ndt Traininginstitute,training, institute, course in Rwanda ndt Traininginstitute,training, institute, course in Saint Helena ndt Traininginstitute,training, institute, course in Saint Kitts and Nevis ndt Traininginstitute,training, institute, course in Saint Lucia ndt Traininginstitute,training, institute, course in Saint Pierre and Miquelon ndt Traininginstitute,training, institute, course in Saint Vincent and the Grenadines ndt Traininginstitute,training, 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Traininginstitute,training, institute, course in Spain ndt Traininginstitute,training, institute, course in Spratly Islands ndt Traininginstitute,training, institute, course in Sri Lanka ndt Traininginstitute,training, institute, course in Sudan ndt Traininginstitute,training, institute, course in Suriname ndt Traininginstitute,training, institute, course in Svalbard ndt Traininginstitute,training, institute, course in Swaziland ndt Traininginstitute,training, institute, course in Sweden ndt Traininginstitute,training, institute, course in Switzerland ndt Traininginstitute,training, institute, course in Syria ndt Traininginstitute,training, institute, course in Taiwan ndt Traininginstitute,training, institute, course in Tajikistan ndt Traininginstitute,training, institute, course in Tanzania ndt Traininginstitute,training, institute, course in Thailand ndt Traininginstitute,training, institute, course in Timor-Leste ndt Traininginstitute,training, institute, course in Togo ndt 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