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21 Cards in this Set
- Front
- Back
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major variables to consider when developing and conducting ultrasonic inspections on bonded structures?
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1) Top skin material type and thickness.
2) adhesive type and thickness 3) underling structure 4) accessibility |
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things to consider for honeycomb material?
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core material, cell size, thickness, and height
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things to consider for laminates?
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number of layers, layer thickness, and layer material
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What Defect class is unbonds or voids in an outer skin-to-adhesive interface?
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class I
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What Defect class is unbonds or voids at the adhesive to core interface?
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class II
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What Defect class is voids between layers of laminates?
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class III
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What Defect class is voids in foam adhesive or unbonds between the adhesive and closure member at core closure member joints?
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class IV
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What Defect class is water in core?
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class V
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What are the characteristics for Reference standards for composites?
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1) are be similar to test part with respect to material, geometry, and thickness.
2) Must contain bonds of good quality except for controlled areas of fabricated unbonds 3) bonded using the adhesive and cure cycle prescribed for the test part |
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thru transmission inspection method for composites, what do Delamination or unbonds cause?
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blocked transmission of sound to the receiving unit.
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the minimum size unbond that can be detected is proportional to the?
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size of the Receiving search unit.
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When performing thru transmission care must be taken to what to avoid misaligned transducers which will generate false indications?
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both transducers must move in tandem
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What method is only applicable to honeycomb structures and is best applied to structures with single layer skin.
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Pulse-echo
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What method employs an angle beam search unit because straight beam search units may produce multiple echo signals from the layers that would interfere with echo signals from the core?
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pulse-echo
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for pulse echo inspection of B/C/L what angle beam search unit may be used?
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30-90 degrees
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The back reflection can generally be established by damping the opposite skin with your finger and noting a slight change in signal the back side of the core signal will be where?
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immediately in front of the damped signal
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what method is used when the best sensitivity is needed for detecting unbonds between the top sheet and the adhesive?
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ringing method
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An unbond below the first layer of adhesive will often not produce a ringing signal because?
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the adhesive bonded to the top sheet will dampen the signal
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Good applications for ringing method is what?
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inspection of core to closure members
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What method is effective for laminate, doubler, and skin to closure member bonds when access to the back side is available?
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damping method
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What is the special ultrasonic test equipment?
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TTU-527/E
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