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This paper addresses the major concern which component porosity represents in Vacuum Infusion (VI) manufacturing due to resin gelation at pressures close to absolute vacuum. Degassing is a fundamental step to minimize or even avoid resin outgassing and enhance dissolution of voids created during preform impregnation. The efficacy of different degassing procedures based on vacuum degassing, and assisted by adding a nucleation medium, High Speed (HS) resin stirring and/or later pressurization during different time intervals have been analyzed in terms of final void content is studied. Through a rigorous and careful design of the manufacturing process, outgassing effects on final void content were isolated from the rest of porosity causes and specimens with two clearly identifiable regions in terms of porosity were manufactured to facilitate its analysis. Maximum void content was kept under 4% and porous area size was reduced by 72% with respect to conventional vacuum degassing when resin was stirred at HS; therefore, highlighting the importance of enhancing bubble formation during degassing.
Jaime Juan; Arlindo Silva; Jose Antonio Tornero; Jose Gámez; Nuria Salán. Void Content Minimization in Vacuum Infusion (VI) via Effective Degassing. Polymers 2021, 13, 2876 .
AMA StyleJaime Juan, Arlindo Silva, Jose Antonio Tornero, Jose Gámez, Nuria Salán. Void Content Minimization in Vacuum Infusion (VI) via Effective Degassing. Polymers. 2021; 13 (17):2876.
Chicago/Turabian StyleJaime Juan; Arlindo Silva; Jose Antonio Tornero; Jose Gámez; Nuria Salán. 2021. "Void Content Minimization in Vacuum Infusion (VI) via Effective Degassing." Polymers 13, no. 17: 2876.
The world is changing and demanding stronger, lighter, and more versatile materials. Taking advantage of the full potential of these materials also requires versatile manufacturing processes. The in situ forming of a liquid-infused preform (ISFLIP) is a new manufacturing process for fiber-reinforced polymer (FRP) parts with shell shapes. ISFLIP is a hybrid process between vacuum infusion (VI) and diaphragm forming. This paper focuses on the mechanical design and experimental validation of a functional prototype of ISFLIP. The novelty of the design lies especially in a double-diaphragm system that is fundamental to carrying out the forming just after the infusion stage. The double-diaphragm system and other two major subsystems, a vacuum table and an infrared heating grid, were devised to benefit from the operational advantages of ISFLIP. The whole prototype, once constructed, was tested by forming some demonstration components. The result of one of these components, a “C” cross-section FRP profile with two sharp joggles, is finally obtained, proving the feasibility of the prototype.
Jaime Juan; M. Núria Salán; Arlindo Silva; Jose A. Tornero. Design of a Prototype for the In Situ Forming of a Liquid-Infused Preform Process. Journal of Mechanical Design 2019, 142, 1 -27.
AMA StyleJaime Juan, M. Núria Salán, Arlindo Silva, Jose A. Tornero. Design of a Prototype for the In Situ Forming of a Liquid-Infused Preform Process. Journal of Mechanical Design. 2019; 142 (1):1-27.
Chicago/Turabian StyleJaime Juan; M. Núria Salán; Arlindo Silva; Jose A. Tornero. 2019. "Design of a Prototype for the In Situ Forming of a Liquid-Infused Preform Process." Journal of Mechanical Design 142, no. 1: 1-27.
El objetivo del trabajo es identificar las áreas de estudio y los factores que toman en cuenta los infantes al registrar sus aspiraciones de carrera u ocupación. La investigación se fundamenta en las teorías contextuales y evolutivas del ciclo de vida de las personas e integra las profesiones tradicionales por género; además implementa un proyecto de investigación-acción en grupos de nivel primaria de dos escuelas de Tepatitlán, Jalisco (México). Los resultados develan que los campos del saber continúan eligiéndose de acuerdo con el género y que los más frecuentes son: ciencias de la salud, biotecnología y ciencias agrícolas, humanidades e ingenierías. Los factores de interacción con mayores registros son de nivel macro-medio y micro (entorno inmediato y próximo), donde se encuentran la familia y la escuela. La infancia es un periodo de logros vocacionales; los programas de orientación vocacional en educación básica ampliarían el panorama informativo y generarían condiciones favorables para los infantes
Gizelle Guadalupe Macías-González; Juan Francisco Caldera-Montes; M. Núria Salán-Ballesteros. Orientación vocacional en la infancia y aspiraciones de carrera por género. Convergencia Revista de Ciencias Sociales 2018, 1 -23.
AMA StyleGizelle Guadalupe Macías-González, Juan Francisco Caldera-Montes, M. Núria Salán-Ballesteros. Orientación vocacional en la infancia y aspiraciones de carrera por género. Convergencia Revista de Ciencias Sociales. 2018; (80):1-23.
Chicago/Turabian StyleGizelle Guadalupe Macías-González; Juan Francisco Caldera-Montes; M. Núria Salán-Ballesteros. 2018. "Orientación vocacional en la infancia y aspiraciones de carrera por género." Convergencia Revista de Ciencias Sociales , no. 80: 1-23.
Contribution: Stereotypes and immediate environment are the reasons for low enrollment of women in STEM studies. Background: The low number of women in STEM degree courses has been the subject of much research, which has found that the lack of female enrollment is not evenly distributed across all STEM studies. In some areas, such as computing, communications, and electrical and electronic engineering (CCEEE), not only has the number of women not increased, it has even fallen. Research Questions: Is there a stereotype for women taking STEM studies? Is this stereotype different between women taking CCEEE and non-CCEEE degrees? What are the main reasons that lead women to enroll in STEM studies? Methodology: A survey was sent to 3699 female students and STEM graduates belonging to the authors' university in six schools with a lowest level of enrollment, and 1060 replies were received. A qualitative study based on data analysis triangulation was performed. Findings: The women surveyed consider social stereotypes (31.47%) and the immediate environment (14.5%) as the main reasons for the low enrollment of women in STEM studies. Surprisingly, the third reason (11.03%) is that women do not like engineering. New knowledge concerning what motivates female students to enroll in STEM studies, what stereotypes they must struggle against, and the existence of possible differences between CCEEE and STEM but non-CCEEE female students could help policy makers and academia to improve female enrollment in STEM and, in particular, in CCEEE studies.
Noelia Olmedo-Torre; Fermin Sanchez Carracedo; M. Nuria Salan Ballesteros; David Lopez; Antoni Perez-Poch; Mireia Lopez-Beltran. Do Female Motives for Enrolling Vary According to STEM Profile? IEEE Transactions on Education 2018, 61, 289 -297.
AMA StyleNoelia Olmedo-Torre, Fermin Sanchez Carracedo, M. Nuria Salan Ballesteros, David Lopez, Antoni Perez-Poch, Mireia Lopez-Beltran. Do Female Motives for Enrolling Vary According to STEM Profile? IEEE Transactions on Education. 2018; 61 (4):289-297.
Chicago/Turabian StyleNoelia Olmedo-Torre; Fermin Sanchez Carracedo; M. Nuria Salan Ballesteros; David Lopez; Antoni Perez-Poch; Mireia Lopez-Beltran. 2018. "Do Female Motives for Enrolling Vary According to STEM Profile?" IEEE Transactions on Education 61, no. 4: 289-297.
[email protected] network members concurred in the diagnosis of the difficulties and opportunities arising from Bologna process implementation and teaching methodologies improvement in Materials Science and Engineering (MSE) teaching. This network has been created with the aim of improving efficiency of underway and future collaborations.The main objectives are related to MSE resources sharing (course programs, exercises, lab scripts, projects, PBL and case studies, etc.). The network will allow classifying those educational resources already individually implemented by each University, monitoring their statewide and promote the creation of new resources. In order to promote discussion and sharing of experiences, achievements and challenges, a workshop is annually organized, arose from the convenience of joining forces on the axes of innovation and improving the quality of teaching in MSE field.
M.Nuria Salán Ballesteros; Luis Cabedo Mas; Mercè Segarra Rubí; Teresa Guraya; Pablo Lopez Crespo; David Sales; Jose Gámez Pérez. [email protected] Network: An innovative proposal for improving teaching and learning in Spanish universities. World Journal on Educational Technology: Current Issues 2017, 9, 67 -74.
AMA StyleM.Nuria Salán Ballesteros, Luis Cabedo Mas, Mercè Segarra Rubí, Teresa Guraya, Pablo Lopez Crespo, David Sales, Jose Gámez Pérez. [email protected] Network: An innovative proposal for improving teaching and learning in Spanish universities. World Journal on Educational Technology: Current Issues. 2017; 9 (2):67-74.
Chicago/Turabian StyleM.Nuria Salán Ballesteros; Luis Cabedo Mas; Mercè Segarra Rubí; Teresa Guraya; Pablo Lopez Crespo; David Sales; Jose Gámez Pérez. 2017. "[email protected] Network: An innovative proposal for improving teaching and learning in Spanish universities." World Journal on Educational Technology: Current Issues 9, no. 2: 67-74.