Test: Theories of Failure

# Test: Theories of Failure

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## 10 Questions MCQ Test GATE Civil Engineering (CE) 2023 Mock Test Series | Test: Theories of Failure

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Test: Theories of Failure - Question 1

### A certain steel has proportionality limit of 300 N/mm2 in simple tension. It is subjected to principal stress of 120 N/mm2 (tensile), 60 N/mm2 (tensile) and 30 N/mm2 (compressive). The factor of safety according to maximum shear stress theory is

Detailed Solution for Test: Theories of Failure - Question 1

Proportionality limit shear stress
= 300/2 = 150N/mm2
Maximum shear stress ∴ Factor of safety = 150/75 = 2.0

Test: Theories of Failure - Question 2

### All the theories of failure, will give nearly the same result when

Detailed Solution for Test: Theories of Failure - Question 2

When one of the principal stresses at a point is large in comparison to the other, the situation resembles uniaxial tension test. Therefore all theories give nearly the same results.

Test: Theories of Failure - Question 3

### The principal stresses developed at a point are +60, -60, 0 MPa. Using shear strain energy theory, factor of safety obtained is √3.  What is yield stress of the material?

Detailed Solution for Test: Theories of Failure - Question 3

The yield stress of a material is the maximum stress that a material can withstand before it begins to yield or deform plastically. The yield stress is often determined using the shear strain energy theory, which states that the yield stress is equal to the product of the factor of safety and the maximum principal stress.

In this case, the maximum principal stress is 60 MPa and the factor of safety is √3.

Therefore, the yield stress of the material is 60 MPa * √3 = 180 MPa.

Therefore, the correct answer is D.

Test: Theories of Failure - Question 4

For ductile material the suitable theory of failure is

Detailed Solution for Test: Theories of Failure - Question 4

For ductile material the most suitable theory is maximum shear stress theory.
Other theories for ductile material, Maximum Strain Energy Theory and Maximum Shear Stress Theory (Most Conservative Theory)
For brittle material the most suitable theory is Maximum Principal Stress Theory.
Other theories for brittle material, Maximum Principal Stress Theory.

Test: Theories of Failure - Question 5

Which of the following theories of failure is most appropriate for a brittle material?

Detailed Solution for Test: Theories of Failure - Question 5

Maximum principal stress theory (Rankine theory) is suitable for brittle materials.

Test: Theories of Failure - Question 6

In a structural member, there are perpendicular tensile stresses of 100 N/mm2 and 50 N/mm2. What is the equivalent stress in simple tension, according to the maximum principal strain theory? (Poisson’s ratio = 0.25)

Detailed Solution for Test: Theories of Failure - Question 6

Equivalent stress
= σ1 - μσ2
= 100 - 0.25 x 50 = 87.5 N/mm2

Test: Theories of Failure - Question 7

Permissible bending moment in a circular shaft under pure bending is M, according to maximum principal stress theory of failure. According to maximum shear theory of failure, the permissible bending moment in the shaft is

Detailed Solution for Test: Theories of Failure - Question 7

According to maximum principal stress theory,
σ1 = σy
According to maximum shear stress theory,
σ1 - σ2 = σy
Under pure bending, Therefore, in both the cases, permissible bending moment is M,

Test: Theories of Failure - Question 8

A shaft subjected to pure torsion is to be designed which of the following theories gives the largest diameter of shaft?

Detailed Solution for Test: Theories of Failure - Question 8

It is clear from the relation T/J = (Shear Stress)/ (Radial Distance) that a shaft subjected to pure torsion is to be designed for maximum shear stress theory.

Test: Theories of Failure - Question 9

If maximum principal stress σ1 = 60 N/mm2, σ2 and σ3 of value zero act on a cube of unit dimensions, then the maximum shear stress energy stored in it would be

Detailed Solution for Test: Theories of Failure - Question 9

Shear strain energy Test: Theories of Failure - Question 10

In a 2D stress system, the two principal stress are p1 = 180 N/mm2 (tensile) and p2 (compressive). For the materials, yield stress in simple tension and compression is 240 N/mm2 and Poisson’s ratio is 0.25. According to maximum normal strain theory for what value of p2 shall yielding commence?

Detailed Solution for Test: Theories of Failure - Question 10

Yielding may occur either in tension or compression.
For yielding in tension,
According to normal strain theory, For yielding in compression, ## GATE Civil Engineering (CE) 2023 Mock Test Series

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