Simple Stress And Strain in Strength Of Materials : Practice MCQ Questions & Answers with Explanations

CONCEPT: Tension is a kind of Force applied to a string or wire along the length from both ends to stretch it. SI unit of Tension is Newton. EXPLANATION: When Tension on a wire is applied, due to forces from both ends the distance between its atoms increases.

Explanation: As per the stress-strain curve, The occurrence of the following points are given below: Proportional limit: It is the highest stress at which stress and strain are directly proportional so that the stress-strain graph is a straight line and follows the Hooke's law. Elastic limit: It is the greatest stress that can be applied to it without causing plastic (permanent) deformation. When a material is stressed to a point below its elastic limit, it will return to its original length once the stress is removed.

Explanation: Stiffness (k): It is defined as the ability of the material to resist the deformation of an object. Stiffness is also defined as the ratio of load applied to the deflection. $k= \frac{P}{\delta}$ Deformation of axially loaded members: The deformation of a structural member with known geometry and subjected to an axial load can be determined by the equation of the form, $\delta = \frac{{PL}}{{AE}}$ $\therefore \delta = \frac{P}{{\frac{{AE}}{L}}}$ ${\frac{{AE}}{L}} = \frac{P}{{\delta}} =k$ The term $\frac{{AE}}{L}$ is defined as the stiffness of the bar.