Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Morphological properties evaluation of porous and anisotropic materials
Submission Author:
Lívia Nogueira , RJ
Co-Authors:
Lívia Nogueira, Lavinia Maria Alves Borges, DANIEL CASTELLO
Presenter: Lívia Nogueira
doi://10.26678/ABCM.COBEM2023.COB2023-1638
Abstract
In the context of the mechanical behavior of materials, predicting the safe limits for a material under a general state of stress requires the application of failure criteria. There are well-established failure criteria for isotropic materials like Mises, Tresca, and Mohr-Coulomb. Nonetheless, materials that exhibit porous and microstructural anisotropy are still challenging, especially concerning the morphology–elasticity relationships. This is a particularly important issue in cellular materials (like bones) and geological materials (like rocks), in which the ability to predict safe load conditions is fundamental in applications such as osteoporosis diagnosis in the medical field, and drilling efficiency in the oil and gas industry. The main goal of this work is to evaluate the use of the Mean Intercept Length (MIL) method to construct fabric tensors that could characterize morphological properties of porous and anisotropic materials. The methodology is based on micromechanical modeling that aim to develop an equivalent continuum that properly models the heterogeneous material, based on the geometry and properties of the individual phases. Regarding the geometric characterization of the microstructure of porous materials, although the volume fraction (or porosity) is recognized as the main parameter of the material’s heterogeneity, it does not provide information about the orientation of the microstructure. Within the elasticity context, the approach used to model the microstructure architecture consists of introducing higher-ranking tensors, called fabric tensors. ImageJ software was used for benchmark image analysis in which fabric tensors are estimated using the MIL method. The results showed good agreement with those expected as a homogenization procedure and opened the perspective of using this tool in elasticity models and failure criteria for anisotropic porous materials.
Keywords
Microstructure, Porous media, anisotropy, fabric tensor, mean intercept length
