Recent content by a_hargy

Yes sorry the areas of the bars are: AB = 20 mm x 20 mm BC = 25 mm x 25 mm AC = 15 mm x 15 mm The next question is to analyse the same structure in Strand7 which I have already completed and it shows a displacement at point C. I am confident that I have calculated the deflection of bar AB...

So there is no way of calculating the deflection of the beam since P > Pcr? Its actually part of a much larger question. I probably should have mentioned this to begin with but I was fairly confident I could complete the other parts. The whole question is: For the 2D three bar truss structure...

nvn: Sorry about that, I typed it in a bit of a rush. P = 30 kN L = 1 m A = 0.000225 m2 (square bar 15 mm x 15 mm) E = 2.22*105 MPa v = 0.31 I = 4.21875*10-9 m4 Using Euler's formula to find the critical load: Pcr = (pi2*E*I) / L2 For which my results are 9.2435 kN proving P > Pcr

Homework Statement I am trying to determine the deformation of a beam loaded as shown in the attached picture. where: P=30kN L=1m A=0.000225m^2 E=2.22*10^5MPa v=0.31 I=4.21875*10^9m^4 Homework Equations Pcr=pi^2*EI/L =9.2435kN where Pcr is the critical load The Attempt at a...

Thanks for that. So is it correct to assume that in this case a spherical container can be treated the same as a cylinder with open ends? Cheers, Adam

Homework Statement The inner diameter of a spherical gas container is 5m, has a wall thickness of 24mm and it is made of steel for which E=200GPa and v=0.29. Knowing the gauge presure in the container is increased from zero to 1.8MPA determine: a) The maximum normal stress in the container...

Thanks so much for all your help collinsmark. I think I finally worked it out. I used the assumption that the elongation of AB/0.8m was equal to the elongation of CD/0.4m then used my previous equations to solve for the unknowns. My results for the forces were: A=9782N C=2935N...

Homework Statement For a plane stress condition (stress z-axis = 0 ), prove the following relations if strain x-axis and strain y-axis are determined by experiments. σ_x=(∈_x+v∈_y/1-v^2)E & σ_y=(∈_y+v∈_x/1-v^2)E where: σ_x = stress in x-axis σ_y = stress in y-axis ∈_x = strain...

Thanks for all your help collinsmark. Assuming that the beam is rigid and does not bend, does this mean that the elongation of the steel bar AB would be greater then that of the steel bar CD assuming that E=0? Or would E infact not equal zero and the elongation of all three steel bars be...

Hi collinsmark The full problem definition is: The three steel bars shown in the figure are pin connected to a horizontal rigid member. If the applied load on the rigid member is 15kN, determine the force developed in each bar. Bars EF and AB each have a cross-sectional area of 25mm2 and bar...

Thanks heaps for that collinsmark. Thanks for taking the time to post that! I'm still a bit stuck on what other equation to use though. I tried using A+C+E=15000 but still get the same results :confused:

Thanks for your fast reply. This may be a silly question but my mind has gone blank at the moment. How do I eliminate E from the two equations?

Homework Statement I need to determine the forces developed in each bar as shown in the attached drawing.Homework Equations The Attempt at a Solution I have taken moments about the points A, C and E and come up with 3 equations and 3 unknowns. Mom@A=0 0.4C+0.8E=3000 Mom@C=0 0.4A-0.4E=3000...

I'm not 100% sure if that's what the question is implying as I'm completely stuck on it. Thanks for the quick reply though.

Homework Statement Three single phase transformers rated 100kVA, 13.2kV/2.4KV are connected in wye-delta on a 3-phase, 18kV line. I need to find the maximum load that can be connected to the transformer bank and the outgoing line voltage. Homework Equations The Attempt at a...