Beam shear is defined as the internal shear stress of a beam caused by the shear force applied to the beam.
V = total shear force at the location in question;
Q = statical moment of area;
t = thickness in the mat erial perpendicular to the shear;
I = Moment of Inertia of the entire cross sectional area.
This formula is also known as t he Jourawski formula.
Shear stresses within a semi- monocoque structure may be calculated by idealizing the cross-section of the structure into a set of stringers (carrying only axial loads ) and webs (carrying only shear flows). Dividing th e shear flow by the thickness of a given portion of the semi-monocoque structure yields the shear stress. Thus, the maximum shear stre ss will occur either in the web of maximum shear flo w or minimum thickness.
Also constructions in soil can fail due to shear; e.g., the we ight of an earth-filled dam or dike may cause th e subsoil to collapse, like a smalllandslide.
The maximum shear stress crea ted in a solid round bar subject to impact is g iven as the equation:
U = change in kinetic e nergy;
G = shear modulus;
V = volume of rod;