Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EXPERIMENTAL STUDY ON THE ANISOTROPIC BEHAVIOR OF OPEN-HOLE GLASS/POLYESTER AND CARBON/EPOXY COMPOSITE SPECIMENS USING THE DIC TECHNIQUE
Submission Author:
Ramon Rudá Brito Medeiros , Rio Grande do Norte
Co-Authors:
Ramon Rudá Brito Medeiros, Letícia Graziele Silva Ribeiro, João Pedro Rodrigues Deodato, Rodrigo Nogueira de Codes, Zoroastro Vilar, Kelly Cristiane Gomes
Presenter: Rodrigo Nogueira de Codes
doi://10.26678/ABCM.COBEM2023.COB2023-0981
Abstract
In most mechanical engineering applications, it is necessary to introduce geometric discontinuities to perform specific functions. The most common example is the hole, which is inserted into structures to allow for unions, attachment of accessories, cable and duct passages, among others. This study investigated the tensile mechanical properties of fiberglass/polyester and carbon fiber/epoxy composites, evaluating the influence of anisotropy under load orientations of 0/90° and ±45°, as well as the behavior of these materials in the presence of a concentric circular hole as a stress concentrator. Strain measurements in the longitudinal and transverse directions on the specimen surface during uniaxial tensile tests were performed using the Digital Image Correlation (DIC) technique, which allowed for measuring the strain distribution profile in the section containing the geometric discontinuity and quantifying the stress concentration caused by it. The mechanical properties obtained in the tests were the ultimate tensile strength, elastic modulus, and fracture strain. The composite laminates exhibited higher stiffness in specimens where the load was applied in the 0/90° orientation. The measured stress concentrations showed different values and are not consistent with the expected values for isotropic materials.
Keywords
Composite, anisotropy, open-hole, DIC, stress concentration factor
