Influence of selected method to estimate composite material elasticity properties on results of finite element analysis
Mateusz Juzuń
Quarterly No. 1, 2019 pages 34-39
DOI:
keywords: material properties, composite materials, Young modulus for composites, finite element method
abstract To perform accurate finite element analysis of composite materials, it is a necessity to enter the correct value of the material properties during model preparation. Since composites consist of at least two components with quite different properties, it is necessary to calculate the resultant properties of the final material. There are a few methods for estimating these parameters. This paper focused on two methods referred to as the Rule of Mixture model, and the Halpin-Tsai model. In the first section, the basic elastic properties of the component materials were cited, then in the next part of paper the elastic properties of the composites were calculated using the aforementioned method. During the calculations both methods were described, along with the range of their application in reality. The parameters were calculated for several composites differing in the percentage of fibers in the composite to present changes in the coefficients on a common graph. All the moduli are collected and presented on graphs. One material was then chosen and used for further analysis. In the next step, finite element analysis (FEA) was performed to estimate the impact of the selected method for determining the material elastic properties on the results of the analysis. FEA analysis was performed using ANSYS Workbench 19.1 ACP Pre/Post software, which allows users to manually enter the properties of the studied materials. The sample was modelled as a laminate, consisting of layers – laminas arranged angularly in relation to each other, which are arranged symmetrically with respect to the median plane of the sample. Two analyses were carried out and then the differences in the final results of the strain values were presented in table form, which indicate the percentage differences between them. This allows one to specify which model of estimating the elastic properties is more precise in the studied case and when it is worth using a more precise method of estimating these values.