Composite materials, Mechanical Engineering

Composite Materials

While two various materials which neither react chemically nor dissolve in every other are combined together so they form a composite materials. Individual of the two constituents be used like a binder while another may be in micro or macro form. The major purpose for such a composite is made is to acquire a property that may not be exhibited via either constituent.

In engineering practice various composites are employed. The most understandable is reinforced cement concrete or RCC employed for building construction. In softer metal matrix, hard particles make composite materials of exceptionally good strength essential for metal cutting tools.

Fibre reinforced plastics or FRP by putting strong fibres in the weaker plastic material matrix form most significant materials employed in engineering practice. The glass and carbon fibres are commonly employed as reinforcement in a variety of plastics.

The ideal material for structural applications necessitates being strong, light and tough. The metals and their alloys satisfy these necessities to a great extent. The metals are not extremely light, so amply tough and strong. The plastics are not tough and strong but such are extremely light. Combining materials along with complementary properties produced composite materials centuries ago.

Egyptians during the days of Pharohs employed bricks reinforced along with chopped straw. Plant fibres were utilized for strengthening potteries in India and South America. Eskimos strengthened ice by employing moss as reinforcing constituent.

The glass fibres such serve like reinforcing constituent in softer plastic matrix are cheaply and conveniently drawn from bulk glass. Even with their higher strength than bulk glass they can't be employed in structure for their high brittleness. The softer plastic matrix has good adhesion along with brittle and extremely thin fibres of glass and protects them from atmospheric attacks via close them in a composite. The glass reinforced plastic renders itself along with convenience of simply moulding in varied geometry's shapes. The glass fibres laid in a mould beside longitudinal direction can be moulded via pouring molten plastic or even by brushing the plastic on framework formed by fibres of glass. Various products like kitchen sinks, motor car body parts, bath tubs, swimming pools and even airplane bodies can be build in GRP.

Carbon fibres were long identified for their electrical fragility and resistance. Though, the strong covalent bond among two carbon atoms would make carbon fibres exceptionally strong. This fact was identified to scientists also. During sixties various companies initiated commercial production of carbon fibres and hence their commercial application in reinforcing of plastic matrix was essentials. These fibres were found to improve high strength adhesive bonding along with epoxy resin resulting into FRP as strong as steel as but lighter than such aluminium.

Boron fibres seem to give strength higher than carbon fibres but are costlier. Various types of fibres that have been tried are those of silicon carbide and various ceramics. Although, the glass and carbon fibres, via far, are the main reinforcing fibres within plastic matrix.

 

Posted Date: 2/27/2013 4:55:03 AM | Location : United States







Related Discussions:- Composite materials, Assignment Help, Ask Question on Composite materials, Get Answer, Expert's Help, Composite materials Discussions

Write discussion on Composite materials
Your posts are moderated
Related Questions
how is varignons theorem useful in engineering mechanics

Let B be the number of bicycles formed  from F bicycle frames and T tires. Each bicycle require exactly two tires and one frame. a. Sketch the isoquants for bicycle production.

Solve the following three questions of the beam ABCD. Note that A is a fixed end; B is apin connection; C is a roller support; and D is a free end.    1)  Sketch the quantita

Plate oil Separator: Check for plate oil separator fitment.

Tank Drainage A large open vertical tank has three small, smooth, well-rounded orifices spaced equidistantly at ¼ h , ½ h , ¾ h up from the bottom of the tank (Fig. Q1). Water

how to flow chart Volume calculation ?


SHIELDING GASES Shielding gas is directed by the torch to the arc and weld pool to protect the electrode and the molten weld metal from atmospheric contamination.  Argon

The resultant moment M acts through the centroid of the aluminum strut, inclined as shown.  (a) Determine the orientation of the neutral axis and show the neutral axis on a sket

Base Circle: this is the smallest circle tangent to the cam profile. Trace Point: this is theoretical point on the follower whose motion explained the movement of the foll