Cuestionario de Compuestos Avanzados

What fiber is black color, very strong, stiff, and used for its rigid strength characteristics?. Kevlar. Kevlar 49. Carbon graphite. Fiberglass.

Talking about composites, What makes the part brittle?. If too much resin is used. If too much fiber is used. If too much core material. Unidirectional.

Which Hybrid Fibers may be selectively placed to give greater strength, flexibility or reduced cost?. Pot life or working life. Interply hybrid. Intraply hybrids. Selective placement.

What is the Aramid?. The high strength-to weight ratio. A and B are correct. Is the name given to aromatic polyamide fibers. Is the name given to the Kevlar fibers.

What is bleeder material?. An nonabsorbent material that is either placed around the edges or on top of the repair to absorb the excess matrix. An absorbent material that is either placed around the edges or on top of the repair to absorb the excess matrix. An sealed material that is either placed around the edges or on top of the repair to absorb the excess matrix. Tedlar.

Which Hybrid utilize reinforcing material that is woven from two or more different fibers?. Intraply hybrids. Selective placement. Interply hybrid. Cure at higher temperatures.

When fasteners are used in carbon/graphite structures they must be made of.. Iron or corrosion resistant steel. aluminum or corrosion resistant steel. titanium or corrosion resistant steel. Shelf life.

Can you used the salvage edge during repair work?. Rubber gloves and Shop coats. Yes, with some restrictions. Yes I can. No I can not.

What is The purpose of mechanical pressure?. Remove excess resin. Increase the curing time. are small spheres of plastic or glass. None.

What are Microballooms?. are small spheres of graphite or glass. are small spheres of plastic or glass. To eliminate the danger of fire. are small spheres of kevlar or glass.

Primary structural components such as the ribs and sking surface of the wing. Can be fabricated of Carbon/Graphite fiber composites. 22Hgin. Can be fabricated of fiberglass fiber composites. Can be fabricated of Kevlar fiber composites.

Which machine performs the following functions: applies atmospheric pressure, applies heat and perform the "ramp and soak"?. Own curing. White gleaming cloth. Heat guns. Hot patch bonding.

The vacuum bag technique can be used in combination with. Molds wet lay up and autoclave. Molds wet lay up and heat blanket. An absorbent material that is either placed around the edges or on top of the repair to absorb the excess matrix. Molds wet lay up and compression molding.

Who was the first to use NOMEX honeycomb on their airplanes?. Boeing. Airbus. Rubber gloves and Shop coats. Embraer.

Is a plastic coating which serves as an additional moisture barrier. Leather. Tedlar. Rubber gloves and Shop coats. Lay up.

Which of the following is the manufacturing process that uses a male and female mold. Mats. Vacuum Bagging. Filament Winding. Compression Molding.

What aspects must be considered when a composite component is designed?. Catalyst. Fabric type, weave and positioning of the fabric patches. Rivet type, weave and positioning of the fabric patches. Fabric type, preg preg B and positioning of the fabric patches.

Which threads are the threads which Interweave with the warp threads?. Bias 45 degrees. Can be fabricated of Carbon/Graphite fiber composites. The warp 0 degrees. Weft (fill) 90 degrees.

The most widely accepted method of curing structural composites employs the use of resin which. Cure at higher temperatures. Cure at lower temperatures. Cure at medium temperatures. Because of its high resistivity.

Talking about core materials, choose the correct answer. Hybrids. The direction of the tear is not parallel to the direction of the ribbon. The direction of the tear is parallel to the direction of the ribbon. The direction of the tear is perpendicular to the direction of the ribbon.

The strength and stiffness of a composite buildup depends on... The orientation of the fibers to the load direction. Adobe. The orientation of the plies to the fiber direction. The orientation of the plies to the load direction.

The strength of the composite depends on... The type of fibers used, the bonding materials used, and how the part is engineered to take specific damage. The type of fibers used, the bonding materials used, and how the part is engineered to take specific stresses. The type of fibers used, and how the part is engineered to take specific stresses. S-glass.

The most simple composite is composed of the two following elements. Usually a layer of fiberglass is used as a barrier, and the aluminum is anodized, primed, and painted prior to assembly. A matrix and resins. Reinforcement material and fabric. A matrix and reinforcement material.

The bonding material that completely surrounds the fiber to give strength and transfer the stresses to the fibers. Visual. Fiber. Matrix or resins. Fabric.

Pre-impregnated fabrics or "pre-pregs" are: The orientation of the plies to the load direction. fabrics that have only the resin system already impregnated up the fabric. fabrics that have only the catalyst already impregnated the fabric. fabrics that have the resin system already impregnated into the fabric.

The first resin that was used to mix with fiberglass was?. Epoxy resin and was used in the 1940s, 1950s. Polyester resin and was used in the 1940s, 1950s. Polyester resin and was used in the 1950s, 1960s. When combined with a matrix, the reinforcing fibers.

Which type of fiberglass is used where a very high tensile strength fiberglass is needed?. Weft (fill) 90 degrees. S-glass. H-glass. E-glass.

If too much resin is used, the part is called. Resin rich. Too rich. Much resin. When combined with a matrix, the reinforcing fibers.

Which of the following is a characteristic of carbon/Graphite?. Is usually yellow color. Is less brittle than Kevlar. If too much resin is used. Is a corrosive when bonded to aluminum.

The central member of an assembly is called. Matrix material. Core material. No I can not. Reinforcing material.

A common misconception of advanced composites is.. That they can be repaired in the same way as the older fiberglass structures. Kevlar 49. That they can be repaired in the same way as the older carbon fiber structures. That they can be repaired in the same way as the older aramid fiber structures.

What should be worn while working with composite resin in order to protect the skin?. Matrix or resins. Leather gloves. Rubber gloves and Shop coats. A. Fabric gloves.

The warp direction is designated at. White gleaming cloth. 45 degree angle to the fill threads. 0 degrees. 90 degrees.

Which of the following contains information about Health precautions, flammability of material, ventilation requirements, and information for health professionals in case of an accident. Material Safety Data Sheet (MSDS). Structural Repair Manual. Shot Bags. OSHA Document.

The reasons for the increasing use of composites are very simple. The greatest advantage is.. The high strength-to cost ratio. The high strength to weight ratio. Selective placement. The high strength-to rich ratio.

The flight control surface that has received a repair require a final inspection for?. Disbond. The Assembly time. Balancing. Delamination.

The simplest composite is made of. Only one element. Pot life or working life. Two elements. At least four elements.

A tightly woven edge produced by the weaver to prevent the edges from raveling is referred to as. Resin rich. Bias 45 degrees. The selvage edge. Weft (fill) 90 degrees.

Chopped fibers that are compressed together are often called. Hybrids. Mats. Core material. Interply.

What type of plastic resins are epoxies?. Thermosets. Thermoplastic. Plastic. Compression Molding.

What is the first inspection technique a mechanic uses?. Ultra sound. Tap Test. The direction of the tear is parallel to the direction of the ribbon. Visual.

What processes are used to prevent corrosion when Carbon/graphite is bonded to an aluminum structure?. Usually a layer of fiberglass is used as a barrier, and the aluminum is anodized, and painted prior to assembly. That they can be repaired in the same way as the older fiberglass structures. Usually a layer of fiberglass is used as a barrier, and the aluminum is primed, and painted prior to assembly. Usually a layer of fiberglass is used as a barrier, and the aluminum is anodized, primed, and painted prior to assembly.

Why the use of "C clamps" is not recommended?. Because as the resin stays static during the cure, the clamps will not compensate to hold a constant pressure. Fabric type, weave and positioning of the fabric patches. Because as the resin flows during the cure, the clamps will not compensate to hold a constant pressure. Because as the resin flows during the cure, the clamps will compensate to hold a constant pressure.

The aircraft structural grade of Kevlar fiber is known as. The type of fibers used, the bonding materials used, and how the part is engineered to take specific stresses. Kevlar 59. Kevlar 49. Kevlar 39.

Which of the following is used in the fabrication of helicopter rotor blades, propellers, and even an entire fuselage. Compression Molding. Vacuum Bagging. Core material. Filament Winding.

The oldest manmade building material is. Adobe. fabrics that have the resin system already impregnated into the fabric. Fiberglass. Carbon fiber.

Where are Ceramics used. Where a low-temperature application is needed. Where a medium-temperature application is needed. Where a high-temperature application is needed. The Assembly time.

Why the fiberglass type E is Also known as "electric glass". Because of its high resistivity. Because of its high tensily. Two elements. Because of its high strength.

Which Hybrid uses two or more layers of different reinforcing material which are laminated together. Interply hybrid. Pot life or working life. Selective placement. Intraply hybrids.

THE FIBER CALLED PREPREG GENERALLY CONTAINS BEFORE CURING A. 40% RESIN. 60% RESIN. Vacuum Bagging. 50% RESIN.

Fiberglass can be recognized as a. Yellow color cloth. White gleaming cloth. Compression Molding. Black color cloth.

may be found in overhead storage bins, and nonstructural applications. Plastic. Thermoplastic. A Resin and A Catalyst. Thermosets.

What gives the primary strength to the composite structure. Rubber gloves and Shop coats. The combined with a matrix, the reinforcing wovens. The combined with a bonded, the reinforcing strands. The combined with a matrix, the reinforcing fibers.

Which of the following is the most commonly used method to apply pressure for composite repairs. Polyester resin and was used in the 1940s, 1950s. Compression Molding. Filament Winding. Vacuum Bagging.

Carbon/graphite fiber composites are used to fabricate primary structural components such as. Remove excess resin. The ribs and skin surface of the rudder. The ribs and skin surface of the elevator. The ribs and skin surface of the wing.

Use heat to form and set the shape of the part permanently. Thermoplastic. The direction of the tear is parallel to the direction of the ribbon. Thermosets. Plastic.

Which method is effective when used on large contoured surfaces which cannot be clamped?. Shot Bags. Vacuum Bagging. Hot patch bonding. Clecos.

Pre-preg fabrics are manufactured to. Eliminate the mixing, applying and worry about whether the proper mix ratio was used or if the proper amount of catalyst was applied. Eliminate the mixing, applying and worry about whether the proper mix ratio was used or if the proper amount of resin was applied. 2°. Eliminate the work, applying and worry about whether the proper mix ratio was used.

How much is the vacuum in a repair. 23Hgin. 22Hgin. 20Hgin. 18Hgin.

Which material is added to resins to control viscosity and weight, to increase pot life?. Resin. Catalyst. Fillers. Resin rich.

Pre-preg fabrics are manufactured by. dipping the woven fabric into a resin solution. dipping the threads fabric inside a resin solution. Vacuum Bagging. dipping the strands fabric on a resin solution.

The two common types of fiberglass are. Vacuum Bagging. E-glass and S-glass. A-glass and S-glass. B-glass and E-glass.

Fiber orientation in which all of the major fibers run in one direction, giving strength in that direction are known as. Shot Bags. Unidirectional. Bidirectional. Multidirectional.

Why should the aircraft and the repair cart be statically ground safety?. To improve the ignition. Filament Winding. To get a high strength to weight ratio. To eliminate the danger of fire.

When were introduced the epoxy resins?. In 1950 with fiberglass reinforcing materials. In 1950 with carbon reinforcing materials. In 1950 with aramid reinforcing materials. Because as the resin flows during the cure, the clamps will not compensate to hold a constant pressure.

The correct amount of fiber to resin ratio is important to get the desired strength. In advanced composite work, a 50:50 ratio is good. What fiber to resin ratio is better?. 20:80. 60:40. 40:60. 40:50.

The threads which run the length of the fabric as it comes off the bolt are referred to as. Bias 45 degrees. The warp 0 degrees. Resin rich. Weft (fill) 90 degrees.

What is breather material?. Placed to one side of the repair to allow air to flow through it and up through the vacuum valve. A. An absorbent material that is either placed around the edges or on top of the repair to absorb the excess matrix. Placed to upper of the repair to allow air to flow through it and up through the repair. 22Hgin.

The big difference between composites and aluminum lies in. The Assembly time. Material cots. Fabrication time. Unidirectional.

What was the first military aircraft with an all composite wing. The AV-9C, known as the Harrier,. The AV-8B, known as the Harrier,. That they can be repaired in the same way as the older fiberglass structures. The AV-7A, known as the Harrier,.

The term "out of freezer life" is. The time that the material is actually out of the freezer and is being cut or transported. The time which the product is still good in an unopened container. The time that the mixed resins will be workable. Because of its high resistivity.

Resin Matrix are two-part systems consisting of. Delamination. A Resin and A filler. A filler and A Catalyst. A Resin and A Catalyst.

This type of fiber orientation calls for fibers to run in two or more directions. Matrix or resins. Mats. Bidirectional or multidirectional. Unidirectional.

What give the primary strength to the composite structure?. When combined with a weave, the reinforcing material. When combined with a fabric, the reinforcing. To eliminate the danger of fire. When combined with a matrix, the reinforcing fibers.

What could happen to the fibers if too much pressure is applied when using a brush or squeegee?. The fibers could pull apart, changing the wovens characteristic of the fabric. The fibers could pull mixed, changing the strength characteristic of the fabric.. The fibers could pull apart, changing the strength characteristic of the fabric. 2*.

Which is the time that the mixed resins will be workable. Pot life or working life. Curing time. White gleaming cloth. Shelf life.

Is the curing agent used on epoxy resins. Pressure. Catalyst. That they can be repaired in the same way as the older fiberglass structures. Heat.

What is the minimum distance a heating blanket must have in a repair. 1°. 3°. None of the above. 2°.

is the time which the product is still good in an unopened container. Curing time. Pot life or working life. Shelf life. Resin rich.