Results
🔴 Max Fracture Torque (estimated)
Tult
—
Full plastic at Rm/√3. Actual fracture depends on hardening — verify by test.
🟠 Permanent Deformation Begins
Ty
—
Surface reaches shear yield. Twist at this point: —°
🟢 Max Torque, No Permanent Deformation
Tallow
—
Design allowable incl. safety factor & weakening limits.
Material & Geometry
Shear Yield τy = Rp0.2/√3 MPa—
Shear Strain at Yield γy—
Polar Moment Jp mm&sup4;—
Torsion Modulus Wp mm³—
Torsion Stiffness k kN·m/°—
Torque Capacity Detail
Twist at Ty θy deg—
Surface Disp uy mm—
Full Plastic Tp = (4/3)Ty kN·m—
Ratio Tp/Ty—
Ultimate Shear τu = Rm/√3 MPa—
Design Allowable Tallow = Ty/SF kN·m—
Weakened Section (Cross-Hole)
Net Polar Moment Jp,net mm&sup4;—
Net Torsion Modulus Wp,net mm³—
Net Yield Ty,net kN·m—
Net Allowable w/ Kt Tallow,hole kN·m—
Net Fracture Tult,net kN·m (est.)—
Residual Twist Control
Max Torque at Given θallow kN·m—
Length & Wind-Up
Twist at Applied T θ deg (top turns vs bottom)—
Slenderness L/d (>10 = check buckling)—
Applied T ≤ Tallow—