Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Notched Strength of Woven Reinforcement Composites Under Mixed-Mode In-Plane Loading
Submission Author:
Felipe Ruivo Fuga , SC
Co-Authors:
Felipe Ruivo Fuga, Mauricio Donadon
Presenter: Felipe Ruivo Fuga
doi://10.26678/ABCM.COBEM2023.COB2023-1652
Abstract
The ever-growing use of fibre reinforced composites as primary structural components within the aerospace industry has required more accurate models for predicting failure. While on the one hand experimental validation is still necessary, specially for composite manufactured parts, on the other, time and budget consuming test campaigns are employed. Therefore, research has played an important role in the development of efficient yet safe structures. For the maximum load bearing capacity of a structural member, different approaches can be employed. Most commonly, stress analyses are employed to determine critical values and regions. While this approach can be sufficient for regions with small stress gradients, it might not be enough for notched members, for example. In such cases, crack stability analysis is usually carried out, from which the maximum load capacity can be determined. There is however a lack of data and analysis on the fracture behavior under mixed-mode in-plane loading, for fibre reinforced composites. Therefore, this paper provides experimental data on the mixed-mode behaviour of woven fabric reinforced thermoset composite specimens, using a Modified Arcan Fixture for mixed-mode testing. Specimens were manufactured by the Resin Transfer Moulding process and machined. Digital Image Correlation technique was used to measure the normal and shear strain fields along the notched length, allowing for a stress intensity factor to be determined. Maximum load as a function of loading angles presented a correlation with predictions for fracture dominated behaviour for opening modes only and stress failure criteria for sliding modes. Proposed criterion requires as input parameters, critical stress intensity factors and strength values, only. These results justify the development of such criterion to be implemented on user material models for finite element analysis, and high-fidelity virtual testing campaigns.
Keywords
mixed mode fracture, composite structures, Fracture Mechanics
