M6c3

52問 • 1年前

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通報

問題一覧

In aircraft engineering terms, a composite usually consists of

a plastic resin matrix and reinforcing fibres of various materials.

Epoxy resins

are the most widely used resin types for aerospace adhesive and composite applications.

Epoxy resins advantage that they

do not react with the solvents and dopes used for fabric coverings.

a thermosetting resin

once cured , it cannot be become liquid again by heating .

A disadvantages of Thermoplastic

lack rigidity not commonly used for aeronautical composite resins.

a resin characteristics

Have ambient temperature storage

Cyanate esters

the material’s has dielectric properties for manufacturing high speed radomes.

The composite part must be as strong and durable as

the original.

the fibres in composite can be wound tightly to increase

strength

Non-heat treatable aluminum alloys can be hardened by

strain hardening.

In (5052-H24) the letter H indicates

Strain hardening .

The composite structural defect of separation of composite panel plies is called

delamination.

Common method of non-destructive of composite material are:

●Tap test ●Ultrasonic inspection ●Radiography/ X ray ●Vibration method and ●Thermal imaging

Specific repair instruction and limitations of damage of composite are provided in

Structural Repair Manual.

Adhesive joints are liable to experience main types of stress:

●Tensile ●Shear ●Cleavage and ●Peel .

proposed repair scheme should meet all the original design requirements

for the structure.

Strength

is the name of the ability to support load without breaking.

Impact resistance

is the ability of a material to withstand impact without shattering.

Stiffness

is the ability of a material to support a load without bending too much.

The name given to the longitudinal direction of the fiber in woven fabric is

warp

is a standard soda glass in common use for windows , etc.

‘A’ Glass

is high resistance to corrosive materials. It is normally produced and used only as a surface matt to reduce cost

C’ Glass

is an improved electrical grade of glass for modern radomes

D’ Glass

A fibre made

of glass.

do not resist flame well and burn through more quickly than other fibres.

Aramid fibres

are made from pure carbon and are black in colour.

Carbon fibres

Carbon fibre composites are known of these general characteristics :

High tensile strength and High compressive strength

Ceramic fibres are used in heat resistant blankets and to weave fireproof cloth for engine and pylon protection.

high temperature application is required ,e.g. a firewall.

Phenolics are fairly brittle system but they have a

good fire/smoke toxicity performance.

are two or three-part systems have good environmental resistance and heat resistance up to150˚C.

Polyesters

Polyester fabric, used on a fabric covered airplane may be attached to the structure by

strings or by use of fabric adhesives.

is a simple structure built-up from layers of cloth impregnated with resin.

A laminate

Plastics are made from materials obtained from

animal or vegetable products and coal or petroleum by-products.

Most aircraft control system pulleys are made from

Tufnol

The best type of wood to be used in the construction of aircraft is

Sitka Spruce

The standard wood type for aircraft wood structures is

Spruce

When selecting wood suitable for aircraft structural use, the growth

rate should be more than 6 rings per inch (25 mm).

The usual method of repairing elongated bolts in a wooden structure is done by

fitting steel bushes.

Ring shake defect of wood is indicated by a parting of the

annular rings.

A visible wrinkle found across the face of piece of wood , in a wooden structural member , is most likely

a compression shake caused by compression load.

On a wooden aircraft structure if there is no evidence of fiber adhesion in the glue in a failed glued joint,

this may indicate glue deterioration .

Curved wooden parts are made by

soaking or steaming wood strips then clamping in a jig to set the bend.

wood shrinkage occurs greatest in the

tangential direction to the growth ring.

Fish – eyes are small areas which have not dried uniformly due to

surface contamination with oil, wax or silicone products.

Iron oxide is sometimes added to aircraft dope to improve its

durability to adhesion

Retarder is used to slow the drying time of dope finishes to prevent

blush

is the only inspection method for identifying excess tension in aircraft fabric covering .

Observation

Excessive tension in aircraft fabric is

usually caused by excessive dope film on new covering.

Fabric repair seams on a fabric covered aeroplane should be

covered with tape.

Lacing cord or stringing chord used on aircraft fabric covering must have a minimum breaking strength of

60 Ib

Lap seam is the only seam type in a fabric covering requires that the selvedge be left on ,or the fabric edge cut with

pinking shears.

The name of time between heating and quenching

is cooling time (typically seven seconds)

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問題一覧

In aircraft engineering terms, a composite usually consists of

a plastic resin matrix and reinforcing fibres of various materials.

Epoxy resins

are the most widely used resin types for aerospace adhesive and composite applications.

Epoxy resins advantage that they

do not react with the solvents and dopes used for fabric coverings.

a thermosetting resin

once cured , it cannot be become liquid again by heating .

A disadvantages of Thermoplastic

lack rigidity not commonly used for aeronautical composite resins.

a resin characteristics

Have ambient temperature storage

Cyanate esters

the material’s has dielectric properties for manufacturing high speed radomes.

The composite part must be as strong and durable as

the original.

the fibres in composite can be wound tightly to increase

strength

Non-heat treatable aluminum alloys can be hardened by

strain hardening.

In (5052-H24) the letter H indicates

Strain hardening .

The composite structural defect of separation of composite panel plies is called

delamination.

Common method of non-destructive of composite material are:

●Tap test ●Ultrasonic inspection ●Radiography/ X ray ●Vibration method and ●Thermal imaging

Specific repair instruction and limitations of damage of composite are provided in

Structural Repair Manual.

Adhesive joints are liable to experience main types of stress:

●Tensile ●Shear ●Cleavage and ●Peel .

proposed repair scheme should meet all the original design requirements

for the structure.

Strength

is the name of the ability to support load without breaking.

Impact resistance

is the ability of a material to withstand impact without shattering.

Stiffness

is the ability of a material to support a load without bending too much.

The name given to the longitudinal direction of the fiber in woven fabric is

warp

is a standard soda glass in common use for windows , etc.

‘A’ Glass

is high resistance to corrosive materials. It is normally produced and used only as a surface matt to reduce cost

C’ Glass

is an improved electrical grade of glass for modern radomes

D’ Glass

A fibre made

of glass.

do not resist flame well and burn through more quickly than other fibres.

Aramid fibres

are made from pure carbon and are black in colour.

Carbon fibres

Carbon fibre composites are known of these general characteristics :

High tensile strength and High compressive strength

Ceramic fibres are used in heat resistant blankets and to weave fireproof cloth for engine and pylon protection.

high temperature application is required ,e.g. a firewall.

Phenolics are fairly brittle system but they have a

good fire/smoke toxicity performance.

are two or three-part systems have good environmental resistance and heat resistance up to150˚C.

Polyesters

Polyester fabric, used on a fabric covered airplane may be attached to the structure by

strings or by use of fabric adhesives.

is a simple structure built-up from layers of cloth impregnated with resin.

A laminate

Plastics are made from materials obtained from

animal or vegetable products and coal or petroleum by-products.

Most aircraft control system pulleys are made from

Tufnol

The best type of wood to be used in the construction of aircraft is

Sitka Spruce

The standard wood type for aircraft wood structures is

Spruce

When selecting wood suitable for aircraft structural use, the growth

rate should be more than 6 rings per inch (25 mm).

The usual method of repairing elongated bolts in a wooden structure is done by

fitting steel bushes.

Ring shake defect of wood is indicated by a parting of the

annular rings.

A visible wrinkle found across the face of piece of wood , in a wooden structural member , is most likely

a compression shake caused by compression load.

On a wooden aircraft structure if there is no evidence of fiber adhesion in the glue in a failed glued joint,

this may indicate glue deterioration .

Curved wooden parts are made by

soaking or steaming wood strips then clamping in a jig to set the bend.

wood shrinkage occurs greatest in the

tangential direction to the growth ring.

Fish – eyes are small areas which have not dried uniformly due to

surface contamination with oil, wax or silicone products.

Iron oxide is sometimes added to aircraft dope to improve its

durability to adhesion

Retarder is used to slow the drying time of dope finishes to prevent

blush

is the only inspection method for identifying excess tension in aircraft fabric covering .

Observation

Excessive tension in aircraft fabric is

usually caused by excessive dope film on new covering.

Fabric repair seams on a fabric covered aeroplane should be

covered with tape.

Lacing cord or stringing chord used on aircraft fabric covering must have a minimum breaking strength of

60 Ib

Lap seam is the only seam type in a fabric covering requires that the selvedge be left on ,or the fabric edge cut with

pinking shears.

The name of time between heating and quenching

is cooling time (typically seven seconds)