Torsional shear stress

Torsional shear stresses r resulting from torque caused by loads offset from the vessel axis. These loads will normally be small, and need not be considered in preliminary vessel designs. 

Tj direct stress due to agitator mass Tp ( peak torsional shear stress in shaft due to 2.5 times motor rated torque Ts working stress... 

T = torsional shear stress, psi Bp = bearing pressure, psi J = polar moment of inertia, in/... 

Tx = torsional shear stress, psi Tx = direct shear stress, psi CTx = longitudinal normal stress, p.si normal stress, psi C = one-half width of square attachment, in. 

P = angle between parallel beams, degrees a — stress, combined, psi tTb = stress, bending, psi CTp = stress, bearing, psi ffc = stress, compression, psi act = critical budding stress, psi aT = stress, tension, psi T = shear stress, psi Tt = torsional shear stress, psi G = lift angle, degrees... 

In the experiments two nominal global stresses, namely 022, the tensile axial stress, and an, the torsional shear stress, are applied. They produce a global nominal mean normal stress Oa = t22/3 and a deviatoric shear stress = (012 + 022/3) in the surfaces of the tubular specimens. These define the two dimensionless stress parameters for the mean normal stress and the deviatoric shear stress of i = 3aa/ 2 ) and = s/ , respectively. 

Except for glass and other brittle materials, twist angles of 20° to 60° are needed to break fibres. In these conditions, the torsional shear stresses are out-weighed by the tensile stresses due to the increased length on the outside of the fibre. Breaks tend to be geometrically distorted forms of tensile breaks, often with. some additional splitting. Although, I do not know of experimental studies, breaks in brittle fibres would be variants of the. standard forms. 

---