Abstract
1. Expressions have been obtained for transforming the temperature deformation coefficients under a rotation of axes. 2. It has been shown that for orthotropic materials the generalized Hooke's law expressions written in the principal axes of elastic symmetry (1) do not contain the shear coefficient of temperature deformation; these coefficients do however appear if the coordinate axes are rotated. 3. It has been shown that the graphical construction of the expressions for the transformation of the temperature coefficients is similar to that for the transformation of components of the stress or strain tensors. 4. The curve for the shear coefficient of the temperature deformation takes the particular form of a Cassini oval (lemniscate) which is symmetrical about a straight line making an angle of 45° with the elastic symmetry axes.
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