Numerical Analysis of Stress States with the Spheroidal, Lamellar and Vermicular Type of Graphite

Abstract

The paper is concerned with the analysis of tensile stress conditions and microstructure of cast iron with spheroidal, lamellar and vermicular type of graphite. To prepare a geometrical model, quantitative metallography has been used as it enables us to evaluate the structure of the material on the basis of image analysis. The computing structure model has been created in 2-D area by linear triangular elements. On the basis of real structure of the cast iron with spheroidal, lamellar and vermicular type of graphite, a model was created from numerical analysis of tension deformation conditions by finite element method in ADINA software environment. This calculation program helps to solve a very difficult task and has the advantage that the generated model can reflect the actual geometry of the object very well. For the calculation and following statistic evaluation objects, it is necessary to generate a greater number of geometrical models in the future. This theory on modelling of microstructure of materials and following numerical analysis opens new areas and outlooks for usage of computing instruments when analysing the state of the material structure in the area of tension, absorption or frequency qualities of the material. Stress concentration is increased with irregularities of graphite particles shapes.