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For example, if I have a solid square bar made from HDPE and one on surface I bond a thin sheet of Aluminum, how does the torsional behaviour change? Is there a process to calculate the new torsional constant? If this were a bending problem, we could convert the composite cross-section into an equivalent section using the ratios of elastic moduli of the materials and then find the area moment of inertia of the new section. Is there an analogous process for torsion?