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By P. Podio-Guidugli

I are looking to thank R. L. Fosdick, M. E. Gurtin and W. O. Williams for his or her certain feedback of the manuscript. I additionally thank F. Davi, M. Lembo, P. Nardinocchi and M. Vianello for useful comments caused by means of their examining of 1 or one other of the various prior drafts, from 1988 up to now. because it has taken me see you later to deliver this writing to its current shape, many different colleagues and scholars have episodically provided worthy reviews and stuck error: a listing may threat to be incomplete, yet i'm heartily thankful to all of them. eventually, I thank V. Nicotra for skillfully reworking my hand sketches into book-quality figures. P. PODIO-GUIDUGLI Roma, April 2000 magazine of Elasticity fifty eight: 1-104,2000. 1 P. Podio-Guidugli, A Primer in Elasticity. © 2000 Kluwer educational Publishers. bankruptcy I pressure 1. Deformation. Displacement permit eight be a three-d Euclidean house, and allow V be the vector area linked to eight. We distinguish some degree p E eight either from its place vector p(p):= (p-o) E V with admire to a selected starting place zero E eight and from any triplet (~1, ~2, ~3) E R3 of coordinates that we might use to label p. additionally, we endow V with the standard internal product constitution, and orient it in a single of the 2 attainable manners. It then is sensible to think about the interior product a .

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Similarly, the linearized theory of deformation finds its position with respect to the exact theory when it is interpreted as the theory that results when terms of order O(C\) are neglected. ;;-\ sup lui Q + sup IVul. 13) Q REMARKS. 1. 13), the stress power introduced in the preceding section takes the form p(S)(n) = In S· sym(Vu') = * Or others (Exercise 1). In S· E(u·). 43 STRESS 2. 11h with respect to the smallness parameter 82 = A~l sup lut(p)l, ut(p) tET,pEr? = The linearized balance law of angular momentum has the fonn Ian (p where for Q.

4) hence, there is exactly one dynamical process corresponding to a given t-parametrized family of balanced systems of forces. A constitutive assumption is the prescription of a class of dynamical processes; or, in view of the above discussion, the prescription of a class of motions and the accompanying balanced systems of forces. In our present context, the role of a constitutive prescription is to single out a specific class of continuous bodies of Cauchy type. The constitutive assumptions typical of linearly elastic bodies will be discussed at length in the next chapter.

H For example, if Y has multiplicity 2, there are solutions * Cf. [9, 10; 11, Section 21]. , multiple of 11:/2 about a fixed axis. ** Hence, transversely isotropic materials have the symmetry group of a circle in the plane. :j: Problems of classification and representation are at the technical, if not the conceptual, core of the constitutive theory for whatever material class one may wish to consider. Aside from linear elasticity, it is only for finite elasticity that those problems have received a rather extensive, although still incomplete, treatment.

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