Mechanical properties in composite materials, Mechanical Engineering

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.


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?

Posted Date: 2/21/2013 7:57:55 AM | Location : United States

Related Discussions:- Mechanical properties in composite materials, Assignment Help, Ask Question on Mechanical properties in composite materials, Get Answer, Expert's Help, Mechanical properties in composite materials Discussions

Write discussion on Mechanical properties in composite materials
Your posts are moderated
Related Questions
Suspension System, Wheels and Tyres:  There are numerous types of suspensions for connecting the wheels to frame body. The suspension plays the vital role in handling and driving

Punches Figure: Punches A bar which carries a sharp point at one end and used to make a permanent mark on a part is called punch. The point is hard and tempered so tha

POWER SOURCES FOR ARC WELDING Electric arc welding processes constitute a majority of all the welding processes. Most of the weldable materials can be joined by arc welding. D

Free body diagram: Sol.: In a free body diagram, the body is considered by itself and also the effect of the surroundings on the body is shown by forces and moments. Free bod

what is the meaning of 6061 and why its called as 6061?

(i) Hydraulic press:   This can be used to lift a heavy load placed on the platform of larger piston or to press the things placed among the piston and the heavy platfor

CO2 WELDING-Power Source Normally, a power source with constant potential characteristics is used for CO 2 welding as it has the ability to self regulate the welding arc. The

how to prevent absolute noise during meshing of gears

Tessellated Modellers    Solid Modeling This describes a class of simplified boundary-representation modellers which approximate to curved faces by a number of plane faces. Sin