Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ζ = yield strength and E = modulus of elasticity) ?

Related Mcqs:

1. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?

   A. Working
   B. Damaging
   C. Allowable
   D. None of these

2. Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

   A. 0.01
   B. 0.3
   C. 0.75
   D. 0.95

3. ____________________ strain is measured using a ‘strain rosetter’ ?

   A. Volumetric
   B. Shear
   C. Linear
   D. None of these

4. The ratio of lateral strain to linear strain is termed as the___________________?

   A. Poisson’s ratio
   B. Bulk modulus
   C. Modulus of elasticity
   D. Shear modulus

5. The units of Young’s modulus of elasticity and ________________ are the same?

   A. Strain
   B. Stress
   C. Modular ratio
   D. None of these

6. The ratio of linear stress to linear strain is termed as the ____________________?

   A. Modulus of elasticity
   B. Modulus of rigidity
   C. Bulk modulus
   D. None of these

7. The ratio of shear stress to shear strain is called ____________________?

   A. Bulk modulus
   B. Shear modulus
   C. Modulus of rigidity
   D. Modulus of elasticity

8. A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?

   A. 5 mm
   B. 6 mm
   C. 8 mm
   D. 10 mm

9. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _____________ the longitudinal stress?

   A. Half
   B. Equal to
   C. Twice
   D. Eight times

10. In a cylindrical vessel subjected to internal pressure, the longitudinal stress ζL and the circumferential stress, ζn are related by___________________?

    A. ζh = 2 ζL
    B. ζh = ζL
    C. ζh = ζL/2
    D. No relation exists