Discover modulus of elasticity of the composite, Mechanical Engineering

Discover modulus of elasticity of the composite:

A composite of glass fibres and epoxy contain all fibres laid along the length and is needed to carry a stress of 1200 MPa. The limiting stress carried by fibre & epoxy are respectively 2400 MPa and 80 MPa. The volume ratios and modulii of elasticity are defined below :

V f  = 70%,    Vm = 30%,       E f  = 72 GPa,            Em = 3 GPa

The composite is stretched in the direction of fibres.

 (a)       Discover modulus of elasticity of the composite.

 (b)       What percentage of broken fibres might be tolerated if matrix is not to be stressed more than 80% of its capacity.

Solution

E = V f E f  + Vm  Em = 0.7 × 72 + 0.3 × 3 = 51.3 MPa

In Eq.,

 σ′ = 1200 MPa, σ′m = 0.8 × 80 = 64 MPa, E f/ Em    = 72 /3 = 24

∴          x = (1200 - 64 + 0.7 (1 - 24) 64) / (1200 + 64 (1 - 24))

               = 0.388

or, 38.8% broken fibres might be tolerated.

Posted Date: 1/22/2013 1:43:35 AM | Location : United States







Related Discussions:- Discover modulus of elasticity of the composite, Assignment Help, Ask Question on Discover modulus of elasticity of the composite, Get Answer, Expert's Help, Discover modulus of elasticity of the composite Discussions

Write discussion on Discover modulus of elasticity of the composite
Your posts are moderated
Related Questions
One can increase the toughness of a ceramic material by introducing fibers to the structure of the ceramic and create a ceramic-matrix composite. However, unlike other fiber-reinfo

With the aid of a sketch, describe the motion of a solid particle settling in a liquid and discuss the effect on it of applying a centrifugal force. Define the terms Separating

what is the essentials of a good boiler?

what is Direct and Reverse crank method of balancing

a) Why cutting fluids are used for machining of metals? List different types of cutting fluids and additives for cutting  fluids. b) What factors are responsible for surface fin


Numerica l Problems Based on Overhanging Beam: Q: Draw Shear force diagram for the simply supported beam loaded as shown in the figure given below. Sol.: Let the

formulae for finding gross torque developed by the armeture

Strain energy stored in a body due to impact load

Explain Zeroth law and 1 st law of thermodynamics. Describe Internal energy and Enthalpy. What is a PMMFK. Give the expression for reversible workdone in a thermodynamic system