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
What is Data Unification To optimize the UPR data structures, during design we study the semantics of each data type of the supported CAD systems and identify data types that a

There are various methods of producing components from the plastics materials which are supplied in the granular, power and other forms. Various plastics molding processes discu

Editing Dimensions The dimension edit commands, DIMEDIT and DIMTEDIT are used basically to adjust the position of the text part of a dimension. This is usually only necessary,

(a) What do you understand by Inversion of Mechanism ? Describe in detail the following : (i) Crank and Lever mechanism (ii) Double crank Mechanism (b) What are the condit

Q. Safety considerations in multi-unit plants? Segregation of process units within large or multi-unit plants is necessary in order to reduce the risk of a fire spreading. This

diference between thermal and thermodynamic equallibrim

Once vendor drawings are received and piping isometric drawings are prepared, the Mechanical engineer will provide a final stress package to the stress engineer per The stress a

A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (θ = 60.0°) Suppose the tota

How is rending stress designed in plain concrete footing? Rending Stresses Also design the plain concrete footing based on bending moment and shear considerations. In wall f

how we can design a shaft for gear box