Repositório UFSCar

O Repositório Institucional da UFSCar (RI UFSCar) é um sistema de informação que visa armazenar, preservar, organizar e disseminar amplamente a produção intelectual dos diversos setores e segmentos da comunidade da UFSCar, provendo o acesso aberto à informação produzida na instituição e registrada como científica, tecnológica, didática, artístico-cultural e técnico-administrativa.

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Desenvolvimento de blendas ternárias com poli (álcool vinílico) e policaprolactona como estratégia de redução da sensibilidade à água de filmes de amido termoplástico
(Universidade Federal de São Carlos, 2025-09-01) Nicolino, Marcos Vinícius Batista; Costa, Lidiane Cristina; http://lattes.cnpq.br/8246109223926480; https://orcid.org/0000-0002-0280-6994; http://lattes.cnpq.br/2729083804454349; https://orcid.org/0000-0002-6258-107X; Marini, Juliano; Barbosa, Rafael; Carvalho, Antonio José Felix de; Finocchio, Henrique; http://lattes.cnpq.br/4533610255047654; http://lattes.cnpq.br/2477977102127336; http://lattes.cnpq.br/5050955206618507; http://lattes.cnpq.br/4221003986826298; https://orcid.org/0000-0003-2351-3477; https://orcid.org/0000-0001-5041-0292; https://orcid.org/0000-0001-8403-1135
Polymeric solid waste management remains inefficient in mitigating the environmental consequences of improper disposal, motivating the development of biodegradable materials such as thermoplastic starch (TPS), derived from renewable sources. However, TPS is moisture-sensitive and shows tensile strength and elongation at break values about three times lower than those of low-density polyethylene (LDPE), requiring modifications to achieve comparable performance. In this work, TPS blends, with and without citric acid, were formulated with up to 20 wt% poly(ε-caprolactone) (PCL) and up to 30 wt% poly(vinyl alcohol) (PVOH) to produce flexible films. The strategy was based on the hypothesis that combining a polar polymer, a nonpolar polymer, and a modifying agent would direct the morphological development of the ternary system, enabling control over water interaction kinetics while preserving biodegradability. The study comprised: (i) TPS development from different vegetal sources and citric acid concentrations; (ii) definition of the mixing protocol for TPS/PVOH binary blends; and (iii) thermodynamic prediction of ternary blend morphology by correlating surface tensions with observed structures. A strong interaction between TPS and PVOH phases was observed, whereas PCL formed polydisperse domains and migrated toward the film surface. The resulting morphologies directly influenced film properties, leading to tensile strength and elongation at break values up to 15 times higher than neat TPS and wettability comparable to pure PCL with only 20 wt% PCL. Although PCL reduced soil deterioration, it did not inhibit biodegradation. The resulting TPS/PVOH/PCL blends may enable applications requiring a balance between stability in use and biodegradability, such as controlled-release systems and packaging films.
Estudo da cinemática do ensaio de fratura pelo método da cunha com auxílio da técnica de correlação de imagens digitais
(Universidade Federal de São Carlos, 2026-02-18) Cardoso, Matheus William Parmezani; Sciuti, Vinicius Fiocco; http://lattes.cnpq.br/0230261917656691; Canto, Rodrigo Bresciani; http://lattes.cnpq.br/1316268411830615; http://lattes.cnpq.br/5847272027160205; Morais, Mateus Mota; Luz, Ana Paula da; http://lattes.cnpq.br/5284457960648332; http://lattes.cnpq.br/3470395641242374
Castable refractories are indispensable in the basic industry due to their ability to maintain physicochemical properties at high temperatures. Owing to the quasi-brittle nature of these materials, crack initiation and propagation over prolonged service times are inevitable, and improving their durability can be achieved through the development of compositions that maximize resistance to crack propagation. Fracture energy, directly related to this resistance, can be obtained by the Wedge Splitting Test (WST). The Digital Image Correlation (DIC) technique is frequently used with the WST, as it enables non-contact full-field displacement measurements on the specimen. In this work, the repeatability of fracture energy was investigated for seven nominally identical specimens, and the spurious contribution introduced when energy is determined exclusively from testing machine data was quantified. For three WSTs exhibiting the highest repeatability, the efficiency of the experimental setup in transferring work to the specimens, the kinematics of the Load Transfer System (LTS), and the fracture process on both analyzed faces were also investigated. Results showed that measurements based on the vertical actuator displacement systematically overestimate fracture energy by approximately 8.4% relative to CMOD (Crack Mouth Opening Displacement)-based measurements obtained via DIC, with the overall system efficiency stabilizing at 92-93% during the final loading stages. The kinematic analysis demonstrated that the loose-component LTS exhibits globally stable behavior, with negligible sliding at the contacts and roller motion asymmetries below 5% of the final CMOD. Crack propagation showed a two-stage behavior: spatial advance of the crack front followed by progressive crack opening in the post-peak regime.
Desenvolvimento de novos aços inoxidáveis lean - propriedades mecânicas e tribológicas
(Universidade Federal de São Carlos, 2024-04-24) Silva, Rinara Gregório; Labiapari, Willian da Silva; Koga, Guilherme Yuuki; http://lattes.cnpq.br/0933095081175012; https://orcid.org/0000-0003-0792-1139; https://lattes.cnpq.br/2968058733983946; https://orcid.org/0009-0006-8016-4049; Gargarella, Piter; Wolf, Witor; http://lattes.cnpq.br/9656544805116765; http://lattes.cnpq.br/4641435644243916; https://orcid.org/0000-0003-4445-5819
Carbon steels are attractive materials given their low cost and satisfactory mechanical strength for various engineering applications. The low price of carbon steel is ascribed to the reduced content of alloying elements, such as Cr, but with the expense of the corrosion resistance. Stainless steels, in turn, combine high mechanical and corrosion resistances, this latter assured by the higher Cr levels, normally above 10.5 wt%. A large compositional region of steels containing Cr in the range between 6 and 11 wt% is still little explored. These Cr-lean steels promise as competitive alternatives for applications in presence of aqueous medium, whose aggressiveness is low for traditional stainless steels, but high for carbon steels. Thus, this project aims to produce and to evaluate the mechanical and wear resistances of steels with low carbon content (< 200 ppm) and chromium varying between 6 and 11%. The steels were produced in a vacuum induction furnace at the Materials Engineering Department at UFSCar and rolled, annealed, and pickled at Aperam, in Timóteo – MG. The alloys were characterized in terms of chemical composition, microstructure and mechanical properties in tensile tests. Wear resistance under annealed and tempered conditions was assessed through the microsclerometry and dry sand in a rubber wheel. The results showed that the mechanical strength increases with the increase of the chromium content for the annealed condition. On the other hand, in the quenched condition similar properties for all alloys was observed regardless of the Cr content, ~1GPa of tensile strength and a hardness of ~270 HV. The abrasive wear tests showed that the quenched condition has higher resistance, and the predominant wear mechanism was micro-grooving. From this work results we conclude that the martensitic microstructure is not so fragile, it is strong, hard, more resistant to abrasive wear and we can remove the chromium while maintaining the same mechanical strength level for lean alloys.
Educação Física na Educação Infantil: análise dos saberes e fazeres docentes no Campo de Experiências "Corpo, Gestos e Movimentos".
(Universidade Federal de São Carlos, 2026-01-27) Eichenberger, Paula Toffani; Metzner, Andreia Cristina; http://lattes.cnpq.br/6385998417152903; https://lattes.cnpq.br/1479474824229573; https://orcid.org/0009-0009-6171-3251; Zaghi, Flavio Henrique Lara da Silveira; Ferreira, Leandro; http://lattes.cnpq.br/5100595421268220; http://lattes.cnpq.br/5842185212242455
Physical Education plays a crucial role in the integral development of children in Early Childhood Education by combining movement and bodily expression as pedagogical tools. This curricular component not only fosters motor skills but also promotes cognitive, emotional, and social development, encouraging autonomy, creativity, and interaction from the earliest years of life. Therefore, Physical Education teachers play an essential role in planning activities that integrate motor, cognitive, social, and emotional aspects. Their practices should be playful, inclusive, and safe, promoting bodily exploration, collective interaction, and children’s well-being. Furthermore, movement needs to be understood and used as a language of learning, encouraging healthy habits and positive interpersonal relationships. Thus, the main objective of this study was to analyze the didactic-pedagogical possibilities of the Field of Experience “Body, Gestures, and Movements,” proposed by the Brazilian National Common Curricular Base (BNCC), from the perspective of Physical Education teachers working in Early Childhood Education. A qualitative and exploratory research design was adopted. Thirty-one Physical Education teachers from municipal Early Childhood Education institutions in Ribeirão Preto, São Paulo, participated in the study. Data were collected through questionnaires administered via Google Forms, ensuring the confidentiality of the responses, and analyzed based on the principles of content analysis. Finally, a booklet containing suggestions of activities for the Field of Experience “Body, Gestures, and Movements” in Early Childhood Education, as well as a Mini Pedagogical Workshop, was developed. This booklet constitutes the educational product resulting from this master’s dissertation. The results indicated that understandings of the body and movement are organized in a heterogeneous manner, shaped by different educational backgrounds, accumulated professional experiences, and concrete working conditions. It is concluded that, although the Field of Experience is recognized as a curricular reference, the theoretical and pedagogical foundations that support it are not always fully made explicit in teaching practices.
Letramento financeiro: vivências em aulas de Educação Financeira na rede pública paulista
(Universidade Federal de São Carlos, 2025-02-28) Lahr, Felipe Kobata; Oliveira, Paulo César; http://lattes.cnpq.br/7516513469811353; https://lattes.cnpq.br/7030662273479022; Giordano, Cassio Cristiano; Pires, Rogerio Fernando; http://lattes.cnpq.br/1005379144784841; http://lattes.cnpq.br/2795801064535157
This study aims to identify which aspects of the Financial Literacy model were contemplated in the digital materials used and in the Financial Education classes taught in high school in the São Paulo state public school system. The research is qualitative in nature, and the study analyzed 13 classes conducted with 2nd and 3rd year high school students in a public school in Sorocaba-SP. The classes adopted the "from less to more" approach, divided into three phases: "least," addressing debt and default; "zero," focusing on balance and financial planning; and "most," exploring investments. The data were analyzed using the Financial Literacy model, which provides a basis for interpreting the classes, the digital materials, and the students' work. The results indicate that all aspects of Financial Literacy were covered throughout the classes, but highlighted the need for adjustments to the digital materials, greater integration and better use of digital technologies, and improvement of the pedagogical approach of the "from least to most" route. It is concluded that the classes contributed to the mobilization of the elements of Financial Literacy, but also that there is a need for improvements to enhance this mobilization.