Crack length measurement with a potential drop method: a finite element simulation
Research output: Contribution to journal › Article
A potential drop method as used for estimations of crack lengths during three-point-bend experiments, is studied. The mechanical stat is calculated using a finite element method. The deformed body obtained is used for a subsequent calculations of the electrostatic state. Calculations are performed for both two- and three-dimensional models. The material is assumed to be elastic, linearly hardening plastic and electrostatically linear. Large deformations are considered. Further, the non-linearity caused by the load, depending on the contract area between the cylinder on which the load is applied and the specimen, is considered. The increased contact area did not influence the mechanical state very much but have a direct impact on the electrostatic state. THe changes in the potential drop recordings due to deformation and electrical current passing through the load cylinder were shown to be considerable. The study explains, at least partly, the experimental observations. A more reliable registration of crack growth initiation is the main outcome of the analysis.
|Research areas and keywords||
Subject classification (UKÄ) – MANDATORY
|Number of pages||196|
|Journal||International Journal for Numerical Methods in Engineering|
|Publication status||Published - 1993 Jan 1|