Mechanical properties in composite materials, Mechanical Engineering

Assignment Help:

Composite materials consist of two or more distinct components.  Generally we refer to a matrix and a reinforcement.  The reinforcement can be in the form of fibres (continuous or discontinuous) or particles.

To a reasonable approximation, discontinuous (short) fibre and particulate reinforced composites can be treated by the engineer in the same way as any homogeneous isotropic material.  Fibre reinforced composites need to be considered quite differently.  In most cases they are still viewed as homogeneous (i.e. the properties in any given direction are an average value), but anisotropy (direction dependence) of properties cannot be ignored. 

In general, when working with a continuous fibre reinforced material, the engineer must select the lay-up of composite to be used as part of the design process.  The processing route to be used must also be considered at an early stage.

We first consider unidirectional material.

Mechanical Properties of Unidirectional Laminates

Q1 If you are working with a metal, what elastic properties do you need in order to calculate strains (deflections) of a structure under generalised in-plane loading?  Write down the stress-strain relationship for an element of material which experiences stresses σx, σy, τxy in an x-y coordinate system.

Q2 What property data do you need (for a metal) in order to ensure that your design loads will not cause plastic deformation (yielding)?  What are the most widely used yield criteria?

Consider now that you are working with a unidirectional fibre composite material in an engineering application.  Conventionally, the direction along the fibres is the '1' direction and perpendicular to the fibres is the '2' direction.

2080_matrix.png

Principal directions in unidirectional laminate.

Q3  What stiffness and strength property data would be needed to carry out a basic static mechanical design on such a piece of composite material?


Related Discussions:- Mechanical properties in composite materials

Material requisition for quotation procedure, The Mechanical Design Enginee...

The Mechanical Design Engineer/Specialist shall be responsible for mechanical design calculations that are required to ensure that the end product complies with all applicable code

Determine lifting load of crane, Navy divers are called to rescue a group o...

Navy divers are called to rescue a group of office workers trapped in a basement under floodwater in Leeds, UK. The only access to the basement is via a 1.5 x 1.5 m horizontal hatc

The progressive liberalization , The progressive liberalization of the nor...

The progressive liberalization of the norms for foreign investment and import of technology appear to have benefited the automobile sector with production of total vehicles increa

Foil butt seam welding, Foil Butt Seam Welding This is a modification o...

Foil Butt Seam Welding This is a modification of seam welding, in which thin narrow strips of metal arc introduced between one or both of the circular electrodes and the work p

Crank pin and crank shaft - part of combustion engine, Crank Pin and Crank ...

Crank Pin and Crank Shaft - Part of combustion engine: Cran k Pin: Crank pin is region on crank shaft on which big end of connecting rod is attached. These pins are eccentr

Dry friction, Dry Friction: Dry friction (also called as coulomb fr...

Dry Friction: Dry friction (also called as coulomb friction manifests when the contact surfaces are dry and there is tendency for the relative motion. Dry friction is fu

What is, what is soundness of casting.

what is soundness of casting.

Open and closed thermodynamic system, Steam flowing at a rate of 3200 lbm/h...

Steam flowing at a rate of 3200 lbm/hr enters an adiabatic nozzle. The initial condition of steam is: P1 = 250 psi, v1=620 ft/min, v1 = 2.4 ft3/lbm and u1 = 1125.5 Btu/lbm. The ste

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd