Which of the following parameters can be obtained by tension test of a standard specimen?
Tension test determines the parameters related to stress strain curve and also reduction and elongation in area and length can be found respectively.
Proportional Limit is defined as the stress at which the stress strain curves begins to deviate from the straight line.
Explanation: Proportional limit is the point of deviation in stress strain curve.
Which of the following is the definition of Compliance?
Explanation: Compliance is a parameter which is the inverse of stiffness.
Yield strength is defined as the maximum stress at which a marked increase in elongation occurs without increase in________
Explanation: Yield strength is the strength at which strain increases. Now as the strength is constant, therefore load is constant.
For the materials which do not exhibit a well-defined yield points, the yield strength is defined as the stress corresponding to a permanent set of how much percentage of gauge length?
Explanation: Generally for all the practical purpose, an offset of 0.2% of gauge length is considered.
Proof strength is defined as the stress which will produce a permanent extension of how much percentage in the gauge length of the standard test specimen.
Explanation: Proof strength is used in design of fasteners. It corresponds to 0.1% permanent deformation of gauge length.
Which of the following are true about plasticity?
Explanation: This is the basic definition of plasticity.
Which of the following is measure of stiffness?
Explanation: Stiffness is the ability of material to resist deformation under external load. Hence it is measured by modulus of elasticity.
Which of the following facts are true for resilience?
Explanation: Toughness is ability to store energy till proportional limit during deformation and to release this energy when unloaded.
Modulus of resilience is defined as
Explanation: Modulus of resilience is strain energy per unit volume.