### Abstract

We study spring-block systems which are equivalent to the P1-finite element methods for the linear elliptic partial differential equation of second order and for the equations of linear elasticity. Each derived spring-block system is consistent with the original partial differential equation, since it is discretized by P1-FEM. Symmetry and positive definiteness of the scalar and tensor-valued spring constants are studied in two dimensions. Under the acuteness condition of the triangular mesh, positive definiteness of the scalar spring constant is obtained. In case of homogeneous linear elasticity, we show the symmetry of the tensor-valued spring constant in the two dimensional case. For isotropic elastic materials, we give a necessary and sufficient condition for the positive definiteness of the tensor-valued spring constant. Consequently, if Poisson's ratio of the elastic material is small enough, like concrete, we can construct a consistent spring-block system with positive definite tensor-valued spring constant.

Original language | English |
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Pages (from-to) | 617-634 |

Number of pages | 18 |

Journal | Networks and Heterogeneous Media |

Volume | 9 |

Issue number | 4 |

DOIs | |

Publication status | Published - 2014 |

Externally published | Yes |

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### Keywords

- Finite element method
- Linear elasticity
- Spring constant
- Spring-block system

### ASJC Scopus subject areas

- Applied Mathematics
- Statistics and Probability
- Engineering(all)
- Computer Science Applications

### Cite this

*Networks and Heterogeneous Media*,

*9*(4), 617-634. https://doi.org/10.3934/nhm.2014.9.617