Assuming the material considered in each statement is homogeneous, isotropic, linear elastic, and the deformations are in the elastic range, which one or more of the following statement(s) is/are TRUE?
1
A body subjected to hydrostatic pressure has no shear stress
2
If a long solid steel rod is subjected to tensile load, then its volume increases
3
Maximum shear stress theory is suitable for failure analysis of brittle materials
4
If a portion of a beam has zero shear force, then the corresponding portion of the elastic curve of the beam is always straight.