5.21. A graphite-epoxy lamina shows the following strength properties: OTU = 40 MPa TU = 275 MPa OLU = 1725 MPa L = 1350 MPa TLTU = 95 MPa Using the maximum-work theory of failure, estimate off-axis shear strength of the lamina for orientations of 30° and 45°.

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Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.