Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Civil Engineering (CE): Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

The document Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Civil Engineering SSC JE (Technical).
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)

Q.1. A plate in equilibrium is subjected to uniform stresses along its edges with magnitude σxx = 30 MPa and σyy = 50 MPa as shown in the figure.
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)The Young’s modulus of the material is 2 x 1011 N/m2 and the Poisson’s ratio is 0.3. If σzz is negligibly small and assumed to be zero, then the strain εzz is _________. 

[2018 : 2 Marks, Set-I]
(a) -120 x 10-6 
(b) -60 x 10-6 
(c) 0.0 
(d) 120 x 10-6
Solution: 

Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)So the answer is (d).

Q.2. A 2 m long, axially loaded mild steel rod of 8 mm diameter exhibits the load-displacement (P-δ) behaviour as shown in the figure.
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)Assume the yield stress of steel as 250 MPa. The complementary strain energy (in N-mm) stored in the bar up to its linear elastic behaviour will be ________.

[2017 : 2 Marks, Set-II]
Solution:
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)Elastic strain: Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Note: For linear elastic material both complementary energy and strain energy is the same.

OR

By considering the given graph in question, between Axial Load and Displacement, the solution will be as follows:
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)Complementary stain energy:
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
It means there seems some error in the given data.

Q.3. In a material under a state of plane strain, a 10 x 10 mm square centred at a point gets deformed as shown in the figure.
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)If the shear strain γxy at this point is expressed as 0.001 k (in rad), the value of k is _________.  

[2017 : 1 Mark, Set-II]
(a) 0.50 

(b) 0.25 
(c) -0.25 
(d) -0.50
Ans.
(d)
Solution:
According to the sign convention:
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
In question, since angle has been increased, therefore, shear strain should be negative.
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Q.4. Consider the stepped bar made with a linear elastic material and subjected to an axial load of 1 kN, as shown in the figure.
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)Segments 1 and 2 have a cross-sectional area of 100 mm2 and 60 mm2. Young’s modulus of 2 x 105 MPa and 3 x 105 MPa, and length of 400 mm and 900 mm, respectively. The strain energy (in N-mm up to one decimal place) in the bar due to the axial load is _________.    

[2017 : 2 Marks, Set-I]
Solution:

Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE) 
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Try yourself:An elastic bar of length L, uniform cross-sectional area A, coefficient of thermal expansion α, and Young’s modulus Eis fixed at the two ends. The temperature of the bar is increased by T, resulting in an axial stress σ. Keeping all other parameters unchanged, if the length of the bar is doubled, the axial stress would be _______. [2017 : 1 Mark, Set-I]
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Try yourself:An elastic isotropic body is in a hydrostatic state of stress as shown in the figure. For no change in the volume to occur, what should be its Poisson’s ratio?
[2016 : 2 Marks, Set-II]
Properties of Metals, Stress & Strain
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Q.7. A tapered circular rod of diameter varying from 20 mm to 10 mm is connected to another uniform circular rod of diameter 10 mm as shown in the following figure. Both bars are made of the same material with the modulus of elasticity, E = 2 x 105 MPa. When subjected to a load P = 30πkN, the deflection at point A is ___ mm.    
[2015 : 2 Marks, Set-I]
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Solution: 

Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Total elongation,
AB is uniform
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
BC is tapered
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
= (9 + 6) mm = 15 mm

Q.8. For the state of stresses (in MPa) shown in the figure below, the maximum shear stress (in MPa) is _______.    
[2014 : 2 Marks, Set-II]
Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Solution:

Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
= 5.0 MPa

Try yourself:The values of axial stress (σ) in kN/m2, bending moment (M) in kNm, and shear force (V) in kN acting at point P for the arrangement shown in the figure are respectively.    
[2014 : 2 Marks, Set-II]
Properties of Metals, Stress & Strain
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Try yourself:A box of weight 100 kN shown in the figure is to be lifted without swinging. If all forces are coplanar, the magnitude and direction (θ) of the force (F) with respect to x-axis should be    [2014 : 2 Marks, Set-I]
Properties of Metals, Stress & Strain
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Try yourself:Creep strains are _________.   [2013 : 1 Mark]
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Try yourself:The Poisson’s ratio is defined as:  [2012 : 1 Mark]
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Try yourself:A rigid beam is hinged at one end and supported on linear elastic springs (both having a stiffness of 'K) at points T and ‘2’, and an inclined load acts at ‘2’, as shown.
Properties of Metals, Stress & Strain
If the load Pequals 100 kN, which of the following options represents forces P1 and P2 in the springs at points ‘1’ and ‘27'? 
[2011 : 2 Marks]
View Solution

Try yourself: A rigid beam is hinged at one end and supported on linear elastic springs (both having a stiffness of 'K) at points T and ‘2’, and an inclined load acts at ‘2’, as shown.
Properties of Metals, Stress & Strain
Which of the following options represents the deflections δ1 and δ2 at points ‘Y and ‘2’?  [2011 : 2 Marks]
View Solution

Try yourself:The number of independent elastic constants for a linear elastic isotropic and homogeneous material is _________.   [2010 : 1 Mark]
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The document Past Year Questions: Properties of Metals, Stress & Strain Notes | Study Civil Engineering SSC JE (Technical) - Civil Engineering (CE) is a part of the Civil Engineering (CE) Course Civil Engineering SSC JE (Technical).
All you need of Civil Engineering (CE) at this link: Civil Engineering (CE)

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