A new static strain measurement method of young's modulus based on the theory of the finite element

摘要

Measurement methods of Young's modulus about static state by beam bending, there are some issues such as having low precision, the range of application is limited, required the special equipment and specimen. Therefore, this paper presents a new strain Measurement Method of Young's modulus about static state based on the theory of Finite Element. Firstly, by studying the relationship among the load, strain, and the stiffness matrix in Finite Element, to establish a relationship between strain and the Young's modulus. Secondly, the paper analyzes the sources of error, and the impact of the raw measurement error and finite element calculation error on its results. Finally, the paper's result is verified by concrete examples, and it's been proved that this method doesn't require special equipments and specimens, with high testing accuracy, besides, it is widely applied to engineering practice.