By Guenard F , Lelievre G

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Let us compare this construction with that of the material G-structure, which we now brieﬂy recap. We start by ﬁxing an arbitrary archetype and attaching to each point X the set PX of all the material isomorphisms from the archetype to the point in question. Since the archetype is a frame at a material point, this procedure is equivalent to attaching to each point of the body the set of frames induced by acting on the archetype with each and every element of PX . In this way, we obtain at each point a subset of all the possible bases of the tangent space at that point.

All we have done is change the order of is satisﬁed identically for all jX 2 the jets from 1 to 2. From the physical point of view, this deﬁnition achieves precisely what we want, namely, a material comparison of second-grade material points that takes into consideration the sensitivity of the material to the second gradients of the transplants. 19). 20) i }. identically for all non-singular {FIi } and all symmetric {FIJ A second-grade body is materially uniform if all its points are mutually materially isomorphic.

They mean, tacitly perhaps, that the body can be put in a conﬁguration such that a mere translation of the neighbourhood of any point to that of any other point will do as a material isomorphism. In other words, in that particular conﬁguration, all the points are indistinguishable from each other as far as the constitutive equation is concerned. 6) in a Cartesian coordinate system would become independent of position. We call such a conﬁguration a (globally) homogeneous conﬁguration. The formalization of this notion of homogeneity is not very diﬃcult.