Determine the stress in composite bar, Mechanical Engineering

Determine the stress in composite bar:

How do you determine the stress in composite bar? What is Modular Ratio?
It becomes essential to have a compound tie or strut (column) where the two or more material elements are fastened together to prevent uneven straining. The salient features of such composite system are: System extends (or contracts) as one unit when it is subjected to tensile (or compressive) load. This implies that the deformation (extension or contraction) of every element is same.

Strain deformation per unit length of each element is same.

Total external load on system equals sum of loads carried out by different materials comprising the composite system.

Take a composite bar subjected to load P and fixed at the top as shown in the given figure. Total load is shared by two bars and as such
1321_Determine the stress in composite bar.png ...(i)
Further elongation in 2 bars are same,  that is,  δL1 = δL2 = δL3 ...(ii)

If strain in bar are equal e1 =  e2;  σ1/E1 = σ2/E2

or, σ1/ σ2 = E1/E2 (when the length is same)

This ratio E1/E2 is called as Modular ratio.

Modular Ratio: Modular ratio is ratio of moduli of elasticity of the two materials. It can be denoted by µ.
86_Determine the stress in composite bar1.png

Posted Date: 10/23/2012 2:12:32 AM | Location : United States

Related Discussions:- Determine the stress in composite bar, Assignment Help, Ask Question on Determine the stress in composite bar, Get Answer, Expert's Help, Determine the stress in composite bar Discussions

Write discussion on Determine the stress in composite bar
Your posts are moderated
Related Questions
A steel pipe with 50 mm OD is covered with a 6.4 mm asbestos insulation followed by a 25 mm layer of fiber-glass insulation [K = 0.0485 Wmk]. The pipe temperature is 393 K and the

Abrasive Machining Processes Such machining processes are precision machining processes. They generate work-piece surfaces along with a high degree of surface smoothness and d

For fan installation detail and indicate correct structural components, drip pan, acoustical and thermal insulation. Provide special acoustical curbs for critical areas. Chec

What are the Technical Limitations of screw conveyer Technical Limitations: ? Turning limitation of this mechanism Actually the Maximum Turning of U-joint is 18° to 2

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

Determine the number of cycles - crack propagation: The plate of above Example  contained a crack of 50 mm length in the centre before it was subjected to cyclic stress. Deter

Thin wall tube has diameter of 60mm. The end of it will be compressed to square form. Calculate how many percents torsion strength will becomne lower at the end of tube?

Complete outer clutch lugs for deep cuts: Visually check for any deep cuts formed on the outer complete clutch lugs.

Solve the following two questions of the truss. Note that A and G are pin supports.  1)  Sketch the influence lines for the force in bar DG (the load is moving on the top chord

Velocity acquired by block - system released from rest: T wo blocks shown in the figure given below, have masses A = 20N and B = 10N and the coefficient of friction between