Font size
WorksheetsNDI Block 6 Study
Total questions: 81
Worksheet time: 20hrs 15mins
The internal configuration of the bonded test part must be understood by the ___.
sergeant
operator
engineers
T.O.
What may harm the material under evaluation?
Grease pencils, chalk, or other marking device
Tap hammer
USN-60/EPOCH 650
Grease pencils, tap hammer, or other marking device
What is NOT a variable consideration?
accessibility (one skin or both skin available)
underlying structure- core material, thickness of core, cell size, etc.
probe- side skin material and thickness
adhesive type and thickness
two or more objects or parts coherence
What is NOT an underlying structure?
foam adhesive and steps in skins
core material, thickness of core
cell size and thickness of cell wall
far-side skin material and thickness
adhesive type and thickness
What is bond?
Voids in foam adhesive or unbonds between the adhesive and a closure member at core-closure member joints
An area within a bonded interface between two adherents in which the intended bonding action failed to take place (Type I, II, IV and strandards)
Separation at an adhesive bond line in a bonded joint (Type I, II, IV)
A substance or agent that causes two or more objects or parts to cohere
What is disbond?
Delaminations or voids between layers of a laminate
An area within a bonded interface between two adherents in which the intended bonding action failed to take place (Type I, II, IV and strandards)
Separation at an adhesive bond line in a bonded joint (Type I, II, IV)
A substance or agent that causes two or more objects or parts to cohere
What is unbond?
Voids at the adhesive-to-core interface
An area within a bonded interface between two adherents in which the intended bonding action failed to take place (Type I, II, IV and strandards)
Separation at an adhesive bond line in a bonded joint (Type I, II, IV)
A substance or agent that causes two or more objects or parts to cohere
A delamination is a separation in layers of laminate (Type III)
True
False
What is a Type I bonded defect?
Voids in foam adhesive or unbonds between the adhesive and a closure member at core-closure member joints
Delaminations or voids between layers of a laminate
Unbonds or voids in an outer skin-to-adhesive interface
Unbonds or voids at the adhesive-to-core interface
Water in the core
What is a Type II bonded defect?
Voids in foam adhesive or unbonds between the adhesive and a closure member at core-closure member joints
Delaminations or voids between layers of a laminate
Unbonds or voids in an outer skin-to-adhesive interface
Unbonds or voids at the adhesive-to-core interface
Water in the core
What is a Type III bonded defect?
Voids in foam adhesive or unbonds between the adhesive and a closure member at core-closure member joints
Delaminations or voids between layers of a laminate
Unbonds or voids in an outer skin-to-adhesive interface
Unbonds or voids at the adhesive-to-core interface
Water in the core
What is a Type IV bonded defect?
Voids in foam adhesive or unbonds between the adhesive and a closure member at core-closure member joints
Delaminations or voids between layers of a laminate
Unbonds or voids in an outer skin-to-adhesive interface
Unbonds or voids at the adhesive-to-core interface
Water in the core
What is a Type V bonded defect?
Voids in foam adhesive or unbonds between the adhesive and a closure member at core-closure member joints
Delaminations or voids between layers of a laminate
Unbonds or voids in an outer skin-to-adhesive interface
Unbonds or voids at the adhesive-to-core interface
Water in the core
When is visual inspection routinely performed?
during in-work process and final part inspection
at the start of the process and final part inspection
at the final part inspection
What are magnifying glass, microscopes, flashlights, and borescopes used for?
visual tools to repair damage and defects
ultrasonic methods to inspect defects
tapping tools to listen for audible changes
visual tools to inspect damage and defects
What are some visual reliability degradations/limitations?
human factors, surface coatings, and contaminations
mechanical properties and contaminations
human factors and mechanical failures
confined surface defects manifested at the surface
What method can be seen when surface defects and some subsurface defects are manifested at the surface?
bondmaster 600
tap hammer method
visual
radiography
Which inspection method provides a simple dependable method for detecting unbonds, disbonds, or delaminations that must propagate near the surface?
EPOCH 650
tap hammer method
visual
radiography
For the Tap Hammer Method, a good bond will produce a ___ ___ sound, a bad area will produce a ___ ___ noise.
sharp distinct; dull /rattling
dull /rattling; sharp distinct
sharp distinct; sharp quiet
rattling /sharp; dull loud
Which method is used to locate structural members, repaired areas, core damage and may be required to determine core damage in honeycomb and detect moisture?
through transmission
tap hammer method
visual
radiography
Entrapped water in honeycomb cells usually appears as a
smooth, consistent, light density area
grainy or porous appearance
smooth and grainy
porous, consistent, dark density area
Which is NOT a EPOCH 650 bond testing method?
Ultrasonic High Resolution
Ultrasonic Ring Pattern
Resonance
Through Transmission
Which is NOT a Bondmaster 600 bond testing method?
Through Transmission
Pitch/Catch Swept - Impulse
Resonance
Mechanical Impedance Analysis
Ultrasonic Ring Pattern (1 - 10 MHz) method is used to detect which type of bonded defect?
Type I
Type II
Type III
Type IV
Why is Ultrasonic Ring Pattern (1 - 10 MHz) method not able to inspect a Type II or another layer of skin/doubler?
due to frequency being too high
due to test part being too large inspect
due to EPOCH 650 incapability
due to attenuation of the signal in the adhesive
Which bond test method uses screen saturation and may dampening to test for multiple echoes?
Resonance
Ultrasonic Ring Pattern
Ultrasonic High Resolution
Through Transmission
Which EPOCH 650 bond test method tests for thickness measurement from .005-inch to several feet?
Resonance
Ultrasonic Ring Pattern
Ultrasonic High Resolution
Through Transmission
Ultrasonic High Resolution (15 MHz) method is used to detect which type of bonded defect of graphite face sheets?
Type I
Type II
Type III
Type IV
Which is true about Ultrasonic High Resolution bond test method?
Has a delay line for better near surface resolution
Minimum size flaw dependent on receiver search unit/transducer
Has an initial pulse (IP) and back reflection (BR)
Able to find exact location of flaw depth
Which EPOCH 650 bond test method tests for thickness measurement from .005-inch to several feet?
Resonance
Ultrasonic Ring Pattern
Ultrasonic High Resolution
Through Transmission
Through Transmission (2.25 or 5 MHz) method is applicable to structures with multiple layers with or without honeycomb and has minimum size flaw dependent on the ___ search unit/transducer?
receiving
transmitting
defective
new
Using Through Transmission method, transducer misalignment will cause a bond response
True
False
Which EPOCH 650 bond test method has sound energy that travels through homogenous materials with no appreciable loss until a discontinuity is encountered?
Resonance
Ultrasonic Ring Pattern
Ultrasonic High Resolution
Through Transmission
Through Transmission method is not able to indicate the depth of a flaw and needs access to both sides of the part for inspection
True
False
How does the Through Transmission (2.25 or 5 MHz) method reflect defects?
Produces an indication between the IP and BR
Produces a partial or total loss of received signal (No BR)
Reflected by screen saturation
Produces an expanded circular type display
How does the Ultrasonic High Resolution (15 MHz) method reflect defects?
Produces an indication between the IP and BR
Produces a partial or total loss of received signal (No BR)
Reflected by screen saturation
Produces an expanded circular type display
Which Bondmaster 600 bond test method tests for bond line/separation and thickness measurement?
Resonance
Pitch/Catch Impluse
Mechanical Impedance Analysis (MIA)
Pitch/Catch Swept
What type of frequency does Resonance use?
single frequency
range of frequencies
low frequency
continuous wave of energy frequency
Which bond testing method uses the flying dot for thickness testing?
Resonance
Pitch/Catch Impluse
Mechanical Impedance Analysis (MIA)
Pitch/Catch Swept
Which bond test method use dual tip, single frequency?
Resonance
Mechanical Impedance Analysis (MIA)
Pitch/Catch Impulse
Pitch/Catch Swept
Which bond test method use dual tip, dual element?
Resonance
Mechanical Impedance Analysis (MIA)
Pitch/Catch Impulse
Pitch/Catch Swept
Pitch/Catch Impulse (2.5 to 70 kHz) method is used to detect which type of bonded defect?
Type I and III
Type II, III, V
Type III, IV
Type I, II, III, IV
When using Pitch/Catch Impulse (2.5 - 70 kHz), the minimum dimension of a detectable flaw is the ___ of the probe tip spacing
5 inches
test area
height
width
What type of frequency does Pitch/Catch Swept use?
single frequency
range of frequencies
low frequency
continuous wave of energy frequency
Which bond test method reflects both phase and amplitude simultaneously displayed as a form of circular patterns on one x-y screen?
Resonance
Mechanical Impedance Analysis (MIA)
Pitch/Catch Impulse
Pitch/Catch Swept
Which bond test method use a single tip, dual element?
Resonance
Mechanical Impedance Analysis (MIA)
Pitch/Catch Impulse
Pitch/Catch Swept
Mechanical Impedance Analysis (MIA) stiffness and mass of the material are measured by the ___ sensor, and displayed in terms of both phase and amplitude values?
receiving
transmitting
dual
refined
Mechanical Impedance Analysis (MIA) has a small contact area so it can be used on stiff irregular or curved surfaces
True
False
Mechanical Impedance Analysis (MIA) would work well with flexible composites
True
False
What are most suitable for detecting damage associated with honeycomb core when using Mechanical Impedance Analysis (MIA)?
skin-to-core disbonds
severely corroded aluminum core
buckled/crushed core
All of the above
What is the purpose of inspections from inspector to inspector?
ensure hazards
ensure consistency
ensure errors
ensure refence standard calibrations
Why are bonded/composite standards important when inspecting test parts?
sets sensitivity levels
ensure repeatability
check equipment performance
all of the above
How many minute intervals should all inspections rescan the calibration standard to ensure instrument remains within calibration limits?
5-minute intervals
10-minute intervals
20-minute intervals
40-minute intervals
As an option, what type of specimen should be used to represent the respective different areas of the test part?
bicycle test specimen
abstract test specimen
irregular test specimen
simple test specimen
If using a simple test specimen as a reference standard, it must be bonded using the adhesive and cure cycle prescribed for the test part
True
False
When using a simple test specimen as a reference standard, it must be ___ to the test part with respect to material, geometry, and thickness and equal to the size of the ___ rejectable unbonds.
similar; minimum
identical; same
opposite; greater
same; same
Producing unbonds by use of grease, vinyl's and other foreign materials not covered in the T.O. 33B-1-1 is
lawful
prohibited
acceptable
unprohibited
Where are bonded structures found?
Thermal insulations, rocket nozzles (tactical and launch vehicles), and heat shields
Aircraft primary and secondary flight control surfaces and aircraft interiors
Wheels and tires of the landing gear
RF/microwave insulations, reflectors and signature control surfaces
What is a structure consisting of two skin facings separated by a lightweight core material
Thermoplastics
Laminated Structure
Matrix
Sandwich Structure
Which structure has the highest strength-to-weight and rigidity-to-weight ratios and creates honeycomb cores (most common design)?
Aramid Structure
Laminated Structure
Advanced Composites
Sandwich Structure
What are some Sandwich Structure core materials?
foam
natural (balsa)
glass
plastic
aluminum
Sandwich structures thickness density and orientation can be tailored through proper selection of skin and core materials due to its
permeability
flexibility and versatility
stiffness and inflexibility
moisture absorption
Which structure may be in the form of sheet or bar, composed of two or more metal layers bonded together using heat, adhesive and pressure?
Carbon Fiber Reinforced Plastics (CFRP)
Laminated Structure
Advanced Composites
Sandwich Structure
What are some types of laminated structures?
metal-to-metal
fiber-reinforced plastics-to-metal
carbon reinforced plastic
laminate-to-laminate structures
All of the above
What is an advanced composite material made of fibrous material embedded in a matrix (adhesive/glue), generally laminated with fibers to give strength and stiffness?
Carbon Fiber Reinforced Plastics (CFRP)
Laminated Structure
Advanced Composites
Sandwich Structure
What is Matrix?
The adhesive (glue) that bonds the fibers to each other and gives side-to-side support, and maintains their position
Sheet or bar composed of two or more metal layers bonded together using heat, adhesive and pressure
Honeycomb structures used for aircraft parts
When a beautiful stranger leads computer hacker Neo to a forbidding underworld, he discovers a shocking truth
What is Thermosetting Resins?
Take an origami shape when cured
Take a permanent set or shape when cured
Can be reshaped or reformed after the part has been processed or consolidated
Can be arched and resume original shape
What is Thermoplastics?
Adhesive glue that bonds fibers to each other
Take a permanent set or shape when cured
Can be reshaped or reformed after the part has been processed or consolidated
Sheet or bar composed of two or more metal layers bonded together
What are the principle load-carrying materials in a composite?
Boron
Graphite
Aramid
Aluminum
Which fiber material has a high tensile and compression strength and lack of galvanic corrosion (making it popular for repairs to cracked metallic structures)?
Boron
Graphite (Carbon)
Aramid (Kevlar)
All of the above
What are the disadvantages of Boron?
moisture absoprtion
too stiff
high cost
difficult to form into odd and curved shapes
Which fiber material has become the material of choice and has strength-to-weight ratios and impact resistance, offering greater design flexibility and better resistance to chemicals and corrosion?
Boron
Graphite (Carbon)
Aramid (Kevlar)
All of the above
Which fiber material have a high potential for causing galvanic corrosion when used with metallic fasteners and structures?
Boron
Graphite (Carbon)
Aramid (Kevlar)
All of the above
Which fiber material has low compression strength and difficult to cut because of fuzzing?
Boron
Graphite (Carbon)
Aramid (Kevlar)
Steel
Which fiber material has exceptional tensile strength and vibration dampening capabilities and outstanding toughness (often used for ballistic body armor)?
Boron
Graphite (Carbon)
Aramid (Kevlar)
Balsa
Which fiber material is known for moisture absorption which will break down the matrix?
Boron
Graphite (Carbon)
Aramid (Kevlar)
Nomex Paper
All fibrous materials has strength ___ to the fiber direction and lack of strength ___ to the fiber direction.
perpendicular; parallel
parallel; parallel
perpendicular; perpendicular
parallel; perpendicular
Matrix type, fiber type, ply orientation, and processing methods are all part of which property of composites?
Moving Properties
Mechanical Properties
Material Properties
Standing Properties
Strength-to-density ratio exceeding aluminum and steel, and fatigue advantage over metals are all part of which property of composites?
Moving Properties
Mechanical Properties
Material Properties
Active Properties
What are advantages of composites?
lightweight
fatigue resistant
free-form and tailored design characteristics
special handing required
outstanding strength/weight and stiffness/weight ratio
What are disadvantages of composites?
moisture absorption
more prone to low velocity impact damage
free-form and tailored design characteristics
expensive and special handing required
repair procedures are lengthy and complex
