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Torsional rigidity of a composite shaft in parallel

Your expression is correct, the proof is carried out below for the left segment of the composite bars: From static force equilibrium, we have $T = T_1 + T_2$ ----- (1) Furthermore, the angle of twist $...
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Timber strength in tangential and radial directions

Consider the trunk of a tree as a set of concentric tubes, perhaps it helps distinguish between the following 3 cases: What your 2nd source refers to as longitudinal tension or compression is indeed ...
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