) What is thermal expansion stress, give equation for thermal deflection with temperature. ii) Most materials expand on heating, name there a material that contracts on heating. iii) Give 1 or more useful application of thermal expansion deflection and 1 or more harmful effect of the same that engineers have to consider in their design.

The following engineering tensile properties are given for the 1080 steel:-Yield strength (MPa): 585-Tensile strength (MPa): 965-Elongation to fracture for specimen of 5cm gage length (%): 12A 5cm long circular rod of 1080 steel specimen with a diameter of 1.28cm isloaded to failure in tension. a) What was the maximum load needed to break the specimen?(20 points)b) If necking initiated at 80% of the total elongation, prior to this point thespecimen deformation is uniform, compute the true stress at the point ofnecking initiation.

Define a homogeneous material?

List 3 of the design methods that can be applied to avoid the occurrence of fatigue

Question 5: Based on the stress-strain diagram for a material shown here, find the followings: Yield strength (MPa = Ultimate strength (MPa) = %3D Ductility (%) = Rupture strength (MPa) =

Do most materials exhibit both ductile and Brittle behavior?

Explain the following  1)creep 2)fatigue 3)other similar material failure if you know any Proper concepts are required not only definitons

Define the term material's failure?

(b) A cylindrical rod made from an unknown metal is 350mm long and has a diameter of 10mm. The rod is subjected to a tensile load. It experiences only elastic deformation and elongates by less than 1.0mm under an applied load of 19,800N. Could any of the four metals listed in the table below could be the unknown metal? If so which ones and why? Material Modulus of Yield Ultimate Elasticity / GPa Strength / MPa Tensile Strength / MPa Aluminium 70 255 420 alloy Brass 100 345 420 Copper alloy Steel 110 250 290 207 450 550

Normally when the creep is considered in materials?