Composite Inspection Methods Quiz
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Questions and Answers

What is the main advantage of the pulse echo method?

  • It requires access to both sides of the structure
  • It can detect defects located at multiple levels throughout the structure
  • It requires two transducers to emit and receive the ultrasonic waves
  • It requires access to only one side of the structure (correct)

    • What is the main purpose of using radiographic inspection on composites?

  • To detect surface cracks and entrapped water in honeycomb core cells
  • To detect differences in thickness or physical density compared to the surrounding material (correct)
  • To detect temperature variations at the surface of a damaged part
  • To detect the extent and size of damage in the composite structure

    • Which of the following can thermography be used to detect?

  • Foreign objects in the composite structure
  • Temperature variations at the surface of a damaged part (correct)
  • Surface or internal cracks in the composite structure
  • Differences in thickness or physical density of the composite

    • What is the main difference between the pulse echo method and the through-transmission method?

    <p>The pulse echo method uses a single transducer, while the through-transmission method uses two transducers</p> Signup and view all the answers

    Which inspection method can be used to detect entrapped water inside honeycomb core cells?

    <p>Radiographic inspection</p> Signup and view all the answers

    Which inspection method is best suited for detecting surface cracks in a composite structure?

    <p>Radiographic inspection</p> Signup and view all the answers

    What is the main purpose of using a reference standard in thermography?

    <p>To compare the temperature variations at the surface of the damaged part</p> Signup and view all the answers

    Which inspection method is best suited for detecting foreign objects embedded in a composite structure?

    <p>Radiographic inspection</p> Signup and view all the answers

    What is a core disbond?

    <p>Separation between the skin and core of a composite sandwich structure</p> Signup and view all the answers

    What can cause a core disbond?

    <p>Both poor adhesion and service loading or impact damage</p> Signup and view all the answers

    What is a kissing bond?

    <p>A type of core disbond that is difficult to detect using NDT methods</p> Signup and view all the answers

    Why is it important to avoid disbonds in composite structures?

    <p>Both to prevent environmental ingress and maintain structural integrity</p> Signup and view all the answers

    Which areas of composite structures are particularly important to avoid disbonds?

    <p>End connections and joins</p> Signup and view all the answers

    How can cracks in composite structures be detected?

    <p>They can be detected using visual inspection and advanced NDI methods</p> Signup and view all the answers

    What is the significance of cracks in composite structures?

    <p>They allow environmental ingress and can lead to further damage under service loading</p> Signup and view all the answers

    When are cracks in composite structures most likely to occur?

    <p>Cracks can occur during manufacturing or under service conditions</p> Signup and view all the answers

    What is the primary purpose of composite inspection techniques and non-destructive testing (NDT) methods?

    <p>To determine the structural integrity of the composite material</p> Signup and view all the answers

    Why must a damaged composite structure be thoroughly inspected?

    <p>To ensure the damage does not extend beyond the immediately apparent defect</p> Signup and view all the answers

    What is the primary method of inspecting aircraft components on a daily basis?

    <p>Visual inspection</p> Signup and view all the answers

    What is the primary factor that determines whether a damaged composite part can be repaired or must be replaced?

    <p>The classification of the damage</p> Signup and view all the answers

    What is the primary purpose of the manufacturer's structural repair manual for composite structures?

    <p>To outline inspection procedures and damage classification factors</p> Signup and view all the answers

    What type of holes can be caused by a lightning strike?

    <p>Pinholes</p> Signup and view all the answers

    Why are bolted and bonded surface patches usually not recommended for composite repairs?

    <p>They cause undesirable aerodynamic changes.</p> Signup and view all the answers

    What is the consequence of allowing moisture to get into the core structure of a composite part?

    <p>Small delamination</p> Signup and view all the answers

    Which repair method involves filling holes or voids by injecting resin into the damaged area?

    <p>Resin injections</p> Signup and view all the answers

    What is the purpose of resin injections in composite repairs?

    <p>To fill holes or voids</p> Signup and view all the answers

    Why are pinholes on the skin surface considered significant even though they are not easily detected?

    <p>They can expand and cause extensive damage</p> Signup and view all the answers

    What determines the exact procedures for repairing various laminated composite structures?

    <p>The extent of the damage</p> Signup and view all the answers

    What is the primary purpose of visual inspection for composite materials?

    <p>To detect surface irregularities and defects like resin-rich areas, delamination, and cracks</p> Signup and view all the answers

    Which tools are useful for visual inspection of composite materials?

    <p>Strong light and magnifying glass</p> Signup and view all the answers

    What is the purpose of tap testing in composite inspection?

    <p>To discover if the finished job or repair has a good bond line or has air pockets or inclusions</p> Signup and view all the answers

    Which instrumental NDT method is most commonly used on composites for detecting internal damage?

    <p>Ultrasonic inspection</p> Signup and view all the answers

    In the pulse echo method of ultrasonic inspection, what does the tester do?

    <p>Generates ultrasonic pulses, sends them through the part, and receives the return echo</p> Signup and view all the answers

    What type of defects can be detected by ultrasonic inspection in composites?

    <p>Delaminations, core crush, and other subsurface defects</p> Signup and view all the answers

    What is the purpose of a microscope in visual inspection of composites?

    <p>To determine if fibers in a cracked surface are broken or if the crack affects the resin only</p> Signup and view all the answers

    What is the through-transmission method in ultrasonic inspection?

    <p>A method where ultrasonic waves are transmitted through the part and received on the other side</p> Signup and view all the answers

    What type of defects can ultrasonic inspection detect in composites?

    <p>Internal damage like delaminations</p> Signup and view all the answers

    Which tool is useful for tap testing in the inspection of composite structures?

    <p>Small tap testing tool</p> Signup and view all the answers

    What is a primary application of visual inspection when inspecting composites?

    <p>Identifying surface cracks</p> Signup and view all the answers

    What is the primary purpose of tap testing in composite inspection?

    <p>Finding air pockets or inclusions</p> Signup and view all the answers

    What makes ultrasonic inspection particularly effective on composites?

    <p>Ability to detect internal damage like delaminations</p> Signup and view all the answers

    Why is a small microscope sometimes used during visual inspection of composites?

    <p>To determine if fibres are broken in cracked surfaces</p> Signup and view all the answers

    What is the main advantage of tap testing in composite inspection?

    <p>Effective discovery of bond line quality</p> Signup and view all the answers

    What is a core disbond specifically referring to in composite structures?

    <p>Separation between the skin and core due to poor adhesion or damage</p> Signup and view all the answers

    What is a kissing bond in composite structures?

    <p>A type of tight or weak bond that is difficult to detect</p> Signup and view all the answers

    How does cracking impact the integrity of composite structures?

    <p>It allows for environmental ingress and damage under service loading</p> Signup and view all the answers

    Why may cracks in composite structures require more advanced methods of non-destructive inspection (NDI)?

    <p>They are often invisible to the naked eye</p> Signup and view all the answers

    What is the significance of avoiding disbonds in joins such as end connections in composite structures?

    <p>To maintain structural integrity and prevent potential failures</p> Signup and view all the answers

    Why should cracks in composite structures be thoroughly inspected?

    <p>To determine their extent and impact on structural integrity</p> Signup and view all the answers

    What role does non-destructive inspection (NDI) play in detecting defects in composite structures?

    <p>It helps identify defects without causing damage to the structure</p> Signup and view all the answers

    When might cracks in composite structures be associated with the final stages of in-service failure?

    <p>When they propagate and weaken the structure</p> Signup and view all the answers

    What is the potential consequence of pinholes on the skin surface of a composite structure?

    <p>Leading to extensive damage</p> Signup and view all the answers

    Why are bolted and bonded surface patches typically not recommended for composite repairs?

    <p>They cause undesirable aerodynamic changes</p> Signup and view all the answers

    Which method involves injecting resin into the hole of a damaged area using a needle and syringe for composite repair?

    <p>Resin injections</p> Signup and view all the answers

    What is the main drawback of moisture intrusion into the core structure of a composite part?

    <p>Causing small delamination to grow into a larger one</p> Signup and view all the answers

    Why are pinholes on the skin surface of a composite structure considered significant despite being hard to detect?

    <p>They could lead to extensive damage</p> Signup and view all the answers

    What aspect determines the procedures for repairing various laminated composite structures?

    <p>The severity of the initial damage</p> Signup and view all the answers

    In which scenario can resin injection repairs be commonly applied?

    <p>On parts with holes or voids</p> Signup and view all the answers

    What type of patches do not restore the strength characteristics of the original composite structure?

    <p>Bolted metal patches</p> Signup and view all the answers

    What is the most desirable type of permanent repair for a composite structure?

    <p>Lamination of new repair plies in the damaged area</p> Signup and view all the answers

    What is the primary disadvantage of potted repairs?

    <p>They do not provide as much strength as a core material plug</p> Signup and view all the answers

    Which step comes first in the composite damage assessment and repair process?

    <p>Find and clean the damaged area</p> Signup and view all the answers

    What is a potential consequence of filling a hole in a composite structure with a resin-and-filler mixture?

    <p>It adds weight and decreases flexibility</p> Signup and view all the answers

    Which step follows the fabrication of the composite repair?

    <p>Prepare the repair site</p> Signup and view all the answers

    What is the purpose of cleaning up the repair site after installing a composite repair?

    <p>To prevent contamination during the inspection process</p> Signup and view all the answers

    Which step in the composite repair process involves non-destructive inspection (NDI)?

    <p>Inspecting the repair for structural integrity</p> Signup and view all the answers

    What is the final step in the composite damage assessment and repair process?

    <p>Document the repair</p> Signup and view all the answers

    What type of damage to an aircraft structure is considered 'non-repairable' according to the text?

    <p>Damage that cannot be repaired and requires the component to be replaced</p> Signup and view all the answers

    What does the presence of areas of condensation on an aircraft structure indicate according to the text?

    <p>Water ingress into the structure</p> Signup and view all the answers

    What is a cosmetic defect in the context of aircraft structures as described in the text?

    <p>A defect on the outer surface skin without damage to the structural reinforcing fibers</p> Signup and view all the answers

    When is tap testing commonly used in composite inspection according to the text?

    <p>Detecting surface cracks</p> Signup and view all the answers

    Why are pinholes on the skin surface of composite structures significant according to the text?

    <p>They can cause stress concentrations</p> Signup and view all the answers

    What does thermography primarily help detect in aircraft structures according to the text?

    <p>Areas of condensation indicating water ingress</p> Signup and view all the answers

    Which type of damage would most likely require component replacement according to the text?

    <p>Damage to the structure or component that cannot be repaired</p> Signup and view all the answers

    What type of defect does cosmetic defect refer to in aircraft structures as mentioned in the text?

    <p>A defect on the outer surface skin with no structural reinforcing fiber damage</p> Signup and view all the answers

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