Quantitative fractography of composites: texture, topography and fracture toughness correlation

• Grant number: 09/08760-9
• Support Opportunities: Regular Research Grants
• Start date: September 01, 2009
• End date: August 31, 2011
• Field of knowledge: Engineering - Aerospace Engineering - Materials and Processes for Aeronautical, Aerospace Engineering
• Principal Investigator: Luis Rogerio de Oliveira Hein
• Grantee: Luis Rogerio de Oliveira Hein
• Host Institution: Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil

Abstract

This proposal aims to offer support in quantitative microscopy and digital image processing for researches in composite materials for aircraft use, looking for the development of quantitative fractography tools based on morphological texture analysis, to practical characterization of structural components and crack propagation micromechanisms contributions on fracture process. This proposal is innovative because it relates the patterns of the evolution of fracture micromechanisms with the effects of UV exposition, humidity and thermal degradation on polymeric chains in micro and nanoscales of resolution. In this way, the fractal approach will be applied for fracture characterization, to establish relationships between fractal dimension and fracture toughness, under I and II loading modes, to the extension of degradation effects, evaluated through atomic force microscopy and related techniques, and fracture micromechanisms. The distribution of fracture mechanisms will be evaluated by their fractal character from elevation maps obtained by 3-D extended depth-of-field reconstruction, from ordered light microscopy image stacks. Nowadays, there is a large demand for this methodology, which justifies the presentation of this proposal, required by many Engineers from industry and academic institutions, such as Embraer, IPEN, CTA and UNESP. Then, the main goals of this proposal are: to create this methodology and to promote some quantitative studies to ensure its liable use to other researchers, by evaluating the significance of fractal analysis to the description of the topography formed by fracture micromechanisms in long carbon fiber polymer reinforced composite materials. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

HOROVISTIZ, ANA LUCIA; DE CAMPOS, KAMILA AMATO; SHIBATA, SILVIA; PRADO, CAMILA C. S.; DE OLIVEIRA HEIN, LUIS ROGERIO. Fractal characterization of brittle fracture in ceramics under mode I stress loading. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 527, n. 18-19, p. 4847-4850, JUL 15 2010. (09/08760-9, 08/01788-2)

MEDEIROS, SIMONE F.; LARA, BARBARA R.; OLIVEIRA, PAULO F. M.; MORAES, RODOLFO M.; ALVES, GIZELDA M.; ELAISSARI, ABDELHAMID; SANTOS, AMILTON M.. Stimuli-Responsive and Biocompatible Poly(N-vinylcaprolactam-co-acrylic acid)-Coated Iron Oxide Nanoparticles by Nanoprecipitation Technique. JOURNAL OF COLLOID SCIENCE AND BIOTECHNOLOGY, v. 2, n. 3, p. 15-pg., 2013-09-01. (09/08760-9)

MEDEIROS, SIMONE F.; SANTOS, AMILTON M.; FESSI, HATEM; ELAISSARI, ABDELHAMID. Thermally-Sensitive and Magnetic Poly(N-Vinylcaprolactam)-Based Nanogels by Inverse Miniemulsion Polymerization. JOURNAL OF COLLOID SCIENCE AND BIOTECHNOLOGY, v. 1, n. 1, p. 14-pg., 2012-06-01. (09/08760-9)