Question

1. A tank 8m in diameter is to carry an internal pressure of 120 KPa. Determine the minimum thickness of the tank plating if the stress is limited to 40 MPa.

2. A rod with cross-sectional area at 100mm^2 is stretched between two fixed points such that the initial tensile load is 10 kN. The rod has a modulus of elasticity equal to 180 GPa and a coefficient of linear expansion or 0.0001m/m*degree C. The initial tension is designed such that the rod will have zero stress when there is a certain change in temperature of the rod environment. Which of the following most nearly gives the value of this temperature change?

3. Determine the maximum flexural stress of a rectangular beam 75 mm wide and 275 mm high is used for the simply supported beam.

Answer 1

3. The maximum flexural stress is nothing but the bending stress acting on the member. I couldnt solve that problem as the span was not mentioned.

Girendatar Plameter of tank & Internal pressure 120kpa Minimum thickness of plate= ? it stress limited to wompa I=fD P= 9810N/m3 (12) = 117.720 Pa t= ID - 117,720 (8) - 22 (40+106) t = 11.77mm 0.01177 m Initial tensite load=lokN. E = 180 Gpa R=0.0001 m/moc. FiL 2KLAT fah AY +22 YAT - - fi +20 YAT 5 - Moot # +27 let, 18010, AT +2 10,000 100x10-6 180x 10 AT AT = a - 10,000 100 1-6 -10000 1000 10 2xlorlog - - = -2.77410 ye I 2x 1807 109

Formulae for Bending stress is My/I

where I is bd^3/12

M is the moment calculated from reactions that we get using analysis.