Rod Inches

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About Stress Analysis?

Tension, Shear Stress, weight, elongation?
Hello,

I can not figure out this question for my homework, hoping somone out there will be able to help me.

A press is to be so designed that the elongation of the two steel tension members A, as shown, does not exceed 1/64 in.
a) The press is to be rated at 10000 lbf. Determine the diameters of the rods.

b) If a maximum stress of 20000 psi is permitted, are the rods safe ?

Here's a pic http://media.giantbomb.com/uploads/1/14406/1165250-cad_assignment_2.jpg

Please don't just post the answers, I need help identifying the formulas I need to use so a solution would be much appreciated. Thank you.

-Joe

http://farm3.static.flickr.com/2427/3991421436_cf1578d52f_o.jpg

I would think the text or the class that assigned the problem has all the formulae. But, I will point out the ones you need.

The rods are circular in cross section. Assume that the load is evenly distributed between the two shown. That means if the rated force is 10,000 lbf, each rod takes 5,000 lbf.

The deflection formula for a prismatic member is d = P*L/(A*E) where:
d = deflection in inches
P = axial load, lbf
L = length of the rods, inches
A = cross section areaof the rods, sq in
E = Young's Modulus for Steel = 30,000,000 psi

Rearrange and solve for A. Then compute the Diameter for this area. This diameter will limit the displacement per (a) of the problem.

Axial stress if force per area. We just computed A, and we know the load is 5000 lbf, so computing the stress is simple. If the stress is less than 20,000 psi, you pass (b).

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