This paper deals with the temperature rise due to material damping in rotating pultruded composite shafts. Pultrusion is a special fabrication process for manufacturing composite structural components whose cross section does not change along its length. Rotating shafts carrying gears or pulleys are examples. These shafts are subjected to side loads as they rotate. This causes them to bend back and forth in a cyclic manner. As a result, every element of the shaft generates heat due to material damping. The heat generation per cycle of motion is known for many materials and so a mathematical analysis is possible. Mathematical treatment of thermal problems involving pultruded composites can be simplified using two-dimensional Cartesian or Axisymmetric models. An explicit unsteady finite difference scheme with heat generation is used to study rotating shafts. The method is straightforward and capable of handling unsteady heat conduction in anisotropic components having single or multiple fiber types. The scheme can handle nonzero initial conditions and general convection type boundary conditions. Examples are used to illustrate the method and to investigate effects of the fiber-matrix thermal conductivity ratios, shaft rpm, and material damping on the temperature history in the material. The results show that, depending on the stiffness and thermal conductivity ratios in the principal directions, the temperature rise can be significant.

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