By Command. Duchêne

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**Additional resources for Flight Without Formulae - Simple Discussions on the Mechanics of the Aeroplane, (2nd Ed.)**

**Example text**

17. A change of frame induces transformations, for each timet, on scalars, vectors, and tensors. 1) between points and vectors and the various relations between scalars, vectors, and tensors be preserved under a change of frame. In particular, we have the following transformation laws: (i) Scalars remain unchanged under changes of frame. (ii) A vector v is transformed into v*=Q(t) v. 3) (iii) Let S be a second-order tensor, regarded as a linear transformation of vectors. 3) of v and w under the change of frame.

I. Basic principles. 15. Bodies and motions. In this subchapter we give a brief outline of those. concepts and principles of mechanics which are of basic importance for the nonlinear field theories 1 • For a detailed discussion of the kinematics and dynamics of continuous media the reader is referred to Chapters B, C, and D of CFT. J is a three-dimensional differentiable manifold, the elements of which are called particles X. This manifold may be referred to a system of co-ordinates which establishes a one-to-one correspondence between particles and triples (Xl, X2, xa) of real numbers: X"=X"(X), IX=1, 2, 3.

In this Chapter we consider constitutive equations involving onlyJthe motion and the stress. Note that, in accord with the observation at the end of Sect. 16, the class of processes consists of the pairs {x, T} where X is an arbitrary motion and T is an arbitrary timedependent symmetric tensor field. , independent of the frame of reference or observer. This means, mathematically, that constitutive equations are subject to the following Principle of material frame-indifference: Constitutive equations must be invariant under changes of frame of reference.