The illustrated uniform composite circular rod is composed of a solid inner core with shear modulus

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The illustrated uniform composite circular rod is composed of a solid inner core with shear modulus μ1 and a different outer core material of modulus μ2. The two materials are assumed to be perfectly bonded at interface r = r1, and thus the interfacial tangential displacements must be continuous uθ1(r1) = uθ2(r1). The composite shaft is to be loaded with an overall torque T. First justify that the angle of twists in each material must be the same and that torques in each material must satisfy T = T1 + T2. Next develop the torque-angle of twist relation:

T = rm + (1-14) ]  12]

and determine the stress τ,θz in each material. Are these stresses continuous across the interface?
Finally establish a relationship between the torques T1 and T2 carried in each material.

T

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