E- materials and processes Flashcards
what does the magnetic particle inspection basic process consist of?
The basic process consist of magnetizing a part, then applying, ferromagnetic particles to the surface area to be inspected. If a discontinuity is present, the particles will form a recognizable pattern on the surface.
what nondestructive testing method could be used for detecting surface cracks, and aluminum fittings?
Dive penetrate, eddy current, ultrasonic testing, and visual inspection
what occurs during the preparation stages when penetrate inspection liquid is applied to and then removed from a part that is cracked
The penetrating liquid enters the crack and remains there in order to make the crack visible after developer is applied
what is the procedure for performing penetrate inspection?
Clean the surface, apply penetrate remove the penetrate dry part applied developer, inspect and interpret results
how many AN standard steel bolts be identified?
By the code markings on the bolt head
what do the markings on the heads of solid shank rivets indicate?
The material of which they are made and their strength
how can the recommended torque for a bowl or not be determined when torque values are not called out in the maintenance procedures?
From the information contained in the standard torque table
what does the grip length of a bolt correspond to
The thickness of the material being fastened with the bolt
well may be accomplished to prevent heat, treated aluminum aloe rivets from becoming hard after the quenching sequence
The rivets may be stored in a refrigerator, a temperature lower than 32°F. They will remain soft for several days.
We may self locking nuts, not be used
Add joints, which subject, either the nut or bolt to rotation
what is the difference between a general purpose, bolt and a close tolerance bolt?
Close tolerance bolts are more accurately than general purpose bolts
what type of cable is commonly used in primary control systems?
extra flexible 7x9 stainless steel cable
How was work hardening obtained?
By cold, working metal
what width would a welding be have and what should be the death of penetration in a butt weld?
Be with should be 3 to 5 times that thickness of the base metal and 100% penetration for a butt well
what are the undesirable characteristics of a Cold weld
cold weld has improper penetration with rough and irregular cold lapse, not feathered into the basement
what are the penetration requirements for a fillet weld?
A fillet weld should be 25 to 50% of the thickness of the base metal
what precision measuring instruments are used to measure outside dimensions
Outside micrometer calipers and vernier calipers
why should a micrometer be periodically calibrated?
If it is dropped, it’s accuracy may be affected
what why is alloy steel that is responsive to heat treatment usually less suitable for welding
Because of its Tennessee to become brittle and lose its ductility in the welded area
what is the main difference between thermal plastic and thermosetting resin?
Thermal plastic resin can be softened by heat and become hard again when cool down. thermosetting resin do not soften when heated, and will char and burn rather than melt.
name one material commonly used as the reinforcing component in the structural composite laminates
aramid, fiberglass, graphite, and fiber
name, one substance commonly used as the matrix material and structural composite laminates
polyester, resin, or epoxy resin
name one advantage of using pre-impregnated materials in the construction or repair of composite components
The reinforcing fibers are completely and evenly permeated with matrix
Which NDT method can be performed without removing the surface coating, such as primer paint in anodizing films, and is effective in detecting surface and sub surface corrosion
Eddie current inspection method
Which steel alloy is noted for its toughness, and his most commonly used for aircraft tubular structure, such as frame members, engine mounts and landing gear parts, and other structural parts
chrome-molybdenum steel
which case harden process is accomplished on steel alloys after heat, treating to produce wear resistance surface on engine parts, such as crankshafts
nitriding
what portable, hardness tester is commonly used for testing, aluminum, alloys, copper, brass, or other relatively soft materials
barcol tester
In what class of threaded fit are aircraft bolts, commonly manufactured
class three medium fit
name at least three properties of metals
hardness, toughness, and ductility
what is the term use that applies to the group of metals that has iron as its principal constituent
ferrous
In aluminum alloy 2XXX through 8XXX series as in 2024 T3 what do the first digits indicate
primary alloying element
Been two types of hardness testers, used on steel and other alloys such as aluminum
Rockwell, brinnell, barcol
what is the term used that applied to a combination of material such as fiber, whisker or particle, surrounded and held in place by resin, informing a structure
Composite structure
what is another commonly known name for aramid material?
Composite structure
what is another commonly known name for an aramid material?
kevlar
name four advantages of composites
High strength to weight ratio, fiber to fiber transfer of stress allowed by chemical bonding ,3.5 to 5 times of steel or aluminum longer than metals, Professor higher corrosion resistance
what are the two general types of self locking nuts?
all metal and fiber lock
what are two basic types of washers?
plain, lock, and special
what hardware is used as a threaded bushing to repair threads
Helicoils
when we’re referring to a standard torque chart, how can a 1/4 28 size bolt be defined?
it is 1/4 inch diameter bolt with a thread count of 28 threads per inch
A solid rivets diameter is measured in what fractional increments
1/32 inch
A solid rivet length is measured in what fractional increment
1/16th of an inch
The diameter of a standard steel bolt as in the part number AN 3–5 is measured in what fractional increment
1/16 of an inch
The length of a in standard steel bolt as in the part number AN 3–5 is measured in what fractional increment
1/8 of an inch
