Metus NDT Services provides training for the inspection of composite materials. We familiarize the student with different types of manufacturing processes and how they can be inspected. In each of our training sessions, all the NDT methods used to inspect composites are discussed.
This course will be filled with a lot of valuable information including field strategies and practical case histories. Medium of teaching will be in audio visual methods using animations, video & power points. Every day practical sessions will be conducted using our advanced NDT equipments. All the required codes will be discussed.
Composite Course Curriculum:
NDT methods used for composites
Materials & Manufacturing
NDT Methods - Ultrasonic, Visual, Bond Testing, Thermography,
a. X-ray inspection (radiography) is used to identify cracks and defects in structures that are not easy to access by visual inspection. Using X-ray inspections we can find:
Large cracks when there is a movement or separation of structure
The X-ray generator is used to find the exact location even in case of small cracks related to the geometry and thickness of the structure.
b. X-ray inspection is not recommended for general use where visual inspection is possible.
c. Radiography inspections of bonded and composite structures are used to identify the quantity of visually identified damage and to aid in the inspection of the condition of bonded panels. Defects such as crushed core and fractures, results of impact damage can be found with radiography.
d. Radiography inspections of lightning strikes will help to identify the quantity of core damage in honeycomb structure.
e. Conditions such as water in honeycomb and large fractures can also be found by X-ray inspection. Also, structural conditions below the surface of a part which can affect other NDT inspections such as ultrasonic bond tests can be identified using radiography. Examples of subsurface structural conditions that can be shown by radiography includes core splice, repair, potting compound, filler foam or too much adhesive.
f. Usually when an X-ray inspection is made, The location and the direction of the possible failure are known from failures that have occurred before. A list of areas has been made from fatigue tests, structural design programs and service failures that have occurred before, for structure that should be examined regularly by X-ray.
g. Use the Maintenance Planning Documents with the Non destructive Testing Manual to do a satisfactory inspection on the airplane.
B. Composite Ultrasonic Inspection:
Ultrasonic inspection is divided into two primary areas: Ultrasonic Flaw Inspection and Ultrasonic Bond Inspection. Ultrasonic Bond Inspection is further divided into inspections for metallic and composite structures.
a. Ultrasonic inspection can be made on almost all types of material used in airplane structures. It is a very sensitive way to find defects on the surface and below the surface of parts. The Boeing Company is interested in its use in material quality control and in airplane maintenance programs. In relation to airplane maintenance and overhaul, the company has looked the most at the landing gear systems and the areas around fastener holes. Inspection procedures have been prepared for all major components of the landing gear systems of airplanes: wheels, cylinders, torque link lugs. Other areas of the airplane are now examined, and it is recommended that individual operators also try to find possible uses of ultrasonic tests in other areas of the airplane.
b. There are three basic ultrasonic test types: (1) pulse-echo, (2) resonance, and (3) through transmission. Of the three, pulse-echo is mostly used.
C. Eddy Current Testing:
Eddy current inspection is one of the most frequently used inspections on in-service airplanes available. Small battery operated instruments have made eddy current instruments to use on airplanes easily.
D. Infrared Thermographic Testing:
Thermography has been accepted as a satisfactory alternative for some in-service airplane inspections. Better, more sensitive, thermography equipment is available now that has expanded the uses for thermography and the types of defects that can be found with thermography. Boeing continues to examine other possible uses for thermography related to NDT inspections of in-service airplanes.