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Q1. An aluminium alloy strut has the hollow regular hexagonal cross-section with side 50 mm each, and a constant thickness 2.5 mm all round along its length, see figure below.

The strut has both ends built-in and its material obeys the following stress-strain law in compression.

770_equation.jpg

 where the stress σ is in N/mm2
 
Determine the strut length that will carry the design load of 210 kN.

1008_strut lenth.jpg

Q2. A material has a stress-strain relationship, which may be represented by the equation:

1812_eqaution_2.jpg

where ε = direct strain, and σ = direct stress 

σ1 = 0.1% proof stress = 356 MPa
σ2 = 0.2% proof stress = 390 MPa
n = a constant
E = Young's Modulus = 70 GPa

A strut of thin-walled, tubular cross-section is made from this material, with a wall thickness of 2.5 mm, a mean diameter of 58 mm and an effective length of 700 mm, pinned about parallel diameters.

Using the tangent modulus method estimate the critical buckling load for this strut.

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M91483

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