List of top Structural Engineering Questions on Simple stress and strain relationships

A child walks on a level surface from point P to point Q at a bearing of 30°, from point Q to point R at a bearing of 90° and then directly returns to the starting point P at a bearing of 240°. The straight-line paths PQ and QR are 4 m each. Assuming that all bearings are measured from the magnetic north in degrees, the straight-line path length RP (in meters) is ________ (rounded off to the nearest integer).
For a linear elastic and isotropic material, the correct relationship among Young's modulus of elasticity $(E)$, Poisson's ratio $(\nu)$, and shear modulus $(G)$ is:

A square plate O-P-Q-R of a linear elastic material with sides 1.0 m is loaded in a state of plane stress. Under a given stress condition, the plate deforms to a new configuration O-P'-Q'-R' as shown in the figure (not to scale). Under the given deformation, the edges of the plate remain straight. 

The horizontal displacement of the point (0.5 m, 0.5 m) in the plate O-P-Q-R (in mm, round off to one decimal place) is \(\underline{\hspace{1cm}}\).

Strain hardening of structural steel means