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dedoda
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السلام عليكم
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A. Based on the results obtained from Tensile Test Experiment in the laboratory
(1)
Draw stress-strain curve for the given mild steel specimen and analyse the variation
Between scale readings and dial readings within the elastic region. Also discuss how it differs in the plastic region.
(2)
Discuss the effect of twist on tensile load.
(3)
If the mild steel specimen is replaced and tested by a rubber specimen of same shape and size. What are the possible variations that would occur?
(4)
Prove that the Elastic Modulus of the same material is constant irrespective of shape, size and load applied.
(5)
Discuss with examples the effect of negative thermal expansion on materials.
(B)
A 1000 long composite rod of hydraulic lift used at a rig site has a short
600mm, is strengthened inside with four steel × Aluminum column of 450mm
Rods of 20mm diameter placed near four corners and one rod of 30mm diameter
Is placed at the centre of the column. The same composite column is attached with
A plunger of 700mm diameter working under a hydrostatic pressure of 3MPa.
The modulus of elasticity for steel is 20 times that of aluminium,
(1)
Find the stresses in each steel rod and aluminum column.
(2)
Calculate the heat flux per unit mass per unit specific heat of the material, if the same stresses are acting on it.
(3)
Calculate the thermal stresses, if the yield if 0.45 mm.
(4)
Also find the yield, when the stresses are increased by 20%.
Assume a suitable value of coefficient of thermal expansion for aluminum.