Abstract
We show that a sufficient condition for the weak limit of a sequence of \(W^1_q\)-homeomorphisms with finite distortion to be almost everywhere injective for \(q \ge n-1\), can be stated by means of composition operators. Applying this result, we study nonlinear elasticity problems with respect to these new classes of mappings. Furthermore, we impose loose growth conditions on the stored-energy function for the class of \(W^1_n\)-homeomorphisms with finite distortion and integrable inner as well as outer distortion coefficients.
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Notes
Müller et al. [44] improved the assumption \(q\ge \frac{p}{p-1}\) to \(q\ge \frac{n}{n-1}\).
Considering that \(D\varphi =0\) a.e. if \(J (x, \varphi ) = 0\), it is assumed that \(K_O (x, \varphi ) = 1\) if \(J (x, \varphi ) = 0\).
Considering that \(Adj D\varphi =0\) a.e. if \(J (x, \varphi ) = 0\), it is assumed that \(K_I (x, \varphi ) = 1\) if \(J (x, \varphi ) = 0\).
In this paper we use a notation \(\Vert F \mid L_p(\varOmega )\Vert \) for the norm of \(F(\cdot )\) in \(L_p(\varOmega )\). In some another texts the same norm is denoted by \(\Vert F\Vert _{L_p(\varOmega )}\).
See [61] for another proof of this property under weaker assumptions.
The exponent r from Theorem 8 can be expressed as \(r=\frac{n (n-1) s}{ns + 1 - s} \ge n-1\).
\(a \sim b\) means that there exist constants \(C_1\), \(C_2 > 0\), such that \(C_1 a \le b \le C_2 a\).
Let us remind that for \(a_i\), \(b_i \ge 0\), \(\frac{1}{k} + \frac{1}{k'} = 1\), \( \bigl |\sum a_i b_i\bigr | = \big (\sum a_i^k \big )^{1/k} \big (\sum b_i^{k'}\big )^{1/{k'}} \) if and only if \(a_i^k\) and \(b_i^{k'}\) are proportional.
i.e. \(\lim _{r\rightarrow 0} \frac{|A \cap B(x,r)|}{|B(x,r)|} = 1\).
The exponent r from Theorem 8 can be expressed as \(r=\frac{n (n-1) s}{ns + 1 - s} \ge n-1\).
i.e. determinants of the matrix that is formed by taking the elements of the original matrix from the rows whose indexes are in \(({i_1},i_2,\ldots ,{i_l})\) and columns whose indexes are in \(({j_1},j_2,\ldots ,{j_l})\).
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This work was partially supported in Sections 1 and 2 by the Ministry of Science and Education of the Russian Federation (Grant 1.3087.2017/4.6) and in Sections 3 and 4 by the Regional Mathematical Center of Novosibirsk State University. The first author was partially supported by Austrian Science Fund (FWF) projects M 2670.
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Molchanova, A., Vodopyanov, S. Injectivity almost everywhere and mappings with finite distortion in nonlinear elasticity. Calc. Var. 59, 17 (2020). https://doi.org/10.1007/s00526-019-1671-4
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DOI: https://doi.org/10.1007/s00526-019-1671-4