Plastics-reinforced plastics and adhesives, Mechanical Engineering

Plastics, Reinforced Plastics And Adhesives

Introduction

Organic materials particularly that occur in nature like wood and leather have been employed for engineering causes. The modern developments whereby weight reduction, easy fabrication, corrosion resistance and superior appearance are being attained have focused attention on the materials termed as plastics.

Plastic is utilized as a class name for a group of materials such can be formed or moulded into several shapes. Plastics are synthetic materials and chemically they relate to yet larger group of materials termed as polymers.

Polymers are materials of complicated nature consisting of various units typically joined in a chain as like structure. The word mer in Greek implies a unit. A monomer is a one unit. Various monomers join together to make a polymer. As an illustration one can consider a polymer termed as polyethylene in given figure.

                                            1559_Plastics, Reinforced Plastics And Adhesives.png

 

                                                               Figure: Polyethylene Polymer

The section that is repeated in polyethylene is C2H4 or ethylene.

Polymers are categorized into three broad divisions, name are: elastomers, fibres and plastics. We will seem the properties and applications of plastics that have now become very commonly utilized engineering materials. Even if much less in strength than metals, plastics are mostly preferred for their low density. Additionally a lot of plastics can be machined simply; they have good surface finish and are not corroded in environment. Plastics do not conduct electricity and thus are employed in domestic electrical fittings. They are increasingly being employed for furniture, piping, and interiors of airplanes, cars and buildings. The mechanical strength of plastics is mostly improved via reinforcing them along with fibres which has specified rise to a various class of materials termed as reinforced plastics. These materials contain very good strength for low density. As before as in 1960 year an average car employed only 12 kgf of plastic that increased to 100 kgf in eighties and as greatly as to 150 kgf in nineties. Additionally, to above properties and ease of assembly, elimination of surface finishing, reduction of vibration and noise and low cost form them very popular in engineering applications of mechanical.

Posted Date: 2/27/2013 4:16:53 AM | Location : United States







Related Discussions:- Plastics-reinforced plastics and adhesives, Assignment Help, Ask Question on Plastics-reinforced plastics and adhesives, Get Answer, Expert's Help, Plastics-reinforced plastics and adhesives Discussions

Write discussion on Plastics-reinforced plastics and adhesives
Your posts are moderated
Related Questions
Define Phase. A phase is a quantity of matter that is homogeneous during in chemical composition and physical structure. Determine if the matter is all gas, all liquid or all s

(a) A mass of 1 kg is to be supported on a spring having a stiffness of 9800N/m. The damping coefficient is 5.9 N-sec/m. Calculate the natural frequency of the system. Determine al

FRICTION WELDING In this, friction is employed to generate heat b/w two sliding or rotating metal surfaces. This process is usually carried out by placing the pieces to be welded

Q. Sustained Bending Moment? When sustained bending moments or axial thrust loadings are applied to the flanged joint during operation in sufficient magnitude to warrant consid

Write the velocity relationship in orthogonal cutting. A bar of 75 mm dia. is reduced to 73 mm by a cutting tool while cutting orthogonally. If the mean length of cut chip is 73.5

Q. Check ferrite content of austenitic stainless steel weld? Check the ferrite content of each austenitic stainless steel weld, including overlay welds, in the as-welded condit

Principal Planes and Principal Stresses: Define the Principal Planes and Principal Stresses. Sol.: When an element in strained body is under action of plane stresses, it i

Explain Principal Process for Abrasive Jet Cutting Machines Abrasive particles are fed from the hopper in to the mixing chamber by regulating device as shown in figure.

Computers control system in flexible manufacturing system

Rockwel l Hardness Test: The specimen is subjected to a major load for about 15 seconds after the initial load. ASTM says 13 scales for testing of wide range of materials. Th