Bi-block positive semidefiniteness of bi-block symmetric tensors
Zheng-Hai HUANG , Xia LI , Yong WANG
Front. Math. China ›› 2021, Vol. 16 ›› Issue (1) : 141 -169.
The positive definiteness of elasticity tensors plays an important role in the elasticity theory. In this paper, we consider the bi-block symmetric tensors, which contain elasticity tensors as a subclass. First, we define the bi-block M-eigenvalue of a bi-block symmetric tensor, and show that a bi-block symmetric tensor is bi-block positive (semi)definite if and only if its smallest bi-block M-eigenvalue is (nonnegative) positive. Then, we discuss the distribution of bi-block M-eigenvalues, by which we get a sufficient condition for judging bi-block positive (semi)definiteness of the bi-block symmetric tensor involved. Particularly, we show that several classes of bi-block symmetric tensors are bi-block positive definite or bi-block positive semidefinite, including bi-block (strictly) diagonally dominant symmetric tensors and bi-block symmetric (B)B0-tensors. These give easily checkable sufficient conditions for judging bi-block positive (semi)definiteness of a bi-block symmetric tensor. As a byproduct, we also obtain two easily checkable suffcient conditions for the strong ellipticity of elasticity tensors.
Bi-block symmetric tensor / bi-block symmetric Z-tensor / bi-block symmetric B0-tensor / diagonally dominant bi-block symmetric tensor / bi-block M-eigenvalue
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Higher Education Press
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