A composite Is any multiphase material that combines differing constituent phase

Question

A composite Is any multiphase material that combines differing constituent phases lies a matrix and a dispersed phase Are engineered to produce a superior material with a better combination of properties All of the above The rule of mixtures for fiber reinforced composites: is accurate for Young s modulus, stresses, density is accurate for tensile strength is to be used with caution for some properties and depending on bonding properties between fiber and matrix a and c The properties of particle reinforced composites can be determined accurately with the rule of mixtures fall between an upper bound and a lower bound Take into account the interface between particles and matrix Laminates: Combine several layers of an anisotropic composite to create a more isotropic material Combine thin face-sheets and a porous material Create a high moment of inertia Corrosion Involves transfer of electrons Does not involve transfer of electrons Is deterioration of material due to chemical reactions Both a and c Some forms of corrosion are Galvanic Corrosion Crevice Corrosion Hydrogen Embrittlement All of the above One of the methods to prevent corrosion is: Anodic protection Cathodic protection c Selective leaching

Explanation / Answer

1.. Answer is D

Comosite Material = Comosition of two or more matrial at microscopic level

= Fiber + Matrix combination Both can be metal or metal + Polymer

Composite material are made to improve mechanical proerties eg Strength, Stiffnesss, Toughness,, High chemical resistance, High fatigue life etc. Sometimes they are better with the parent material.

2...Answer is D

Rule of mixture is accurate for the Youngs Modulus EC= EF VF + EM VM

C= composite, F= Fiber, M= Matrix

Also it is to be used with caution for some properties and deending on the bonding properties of Fiber and matrix.

3....Answer is C.

Particle-reinforced composite = particle-matrix interactions cannot be treated on an atomic or molecular level; the particle reinforced the matrix phase.

- The degree reinforcement or improvement of mechanical behavior depends on strong bonding at the matrix- particle interface.

4....Answer is a.

Laminates are basically assembly of layers , fiber composite material, and by joining all layers would provide improved mechanical proerties.

5....Answer is d.

Corrosion in a aqueous environment and in an atmospheric environment, is an electrochemical process because corrosion involves the transfer of electrons between a metal surface and an aqueous electrolyte solution. And it will deteriorate the material due to checmical reaction.

6.....d

All of the above , Galvanic, Crevice and Hydrogen Embrittlement

67....a

Anodic Protection is the process to Protect corosin

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