Tuesday, April 18th, 2023. Time: 15h
Hybrid! O.C. Zienkiewicz Room, C1 Building, UPC Campus Nord, Barcelona
ABSTRACT
During the manufacturing of thermoset-based Carbon Fibre Reinforced Polymers (CFRPs), micro-residual stresses are developed within the material due to the different chemical-thermal-mechanical properties of the fibre and the polymer. In linerless pressure vessel applications, these micro-residual stresses can lead to transverse cracks at loading, which might cause leakage being a potential cause of premature failure. In this work, a composite sub-laminate Representative Volume Element (RVE) model with a transverse ply discretized at micro-scale level stacked between meso-scale (homogenized) plies is employed to study the micro-residual stresses using FEM. The results show that micro-residual stresses are developed during the curing process due to resin shrinkage and thermal contraction during the cooling phase, asides tensile residual stresses at ply meso-scale level. These residual stresses are the precursors of premature transverse cracking. Further loading analysis shows damage initiation and crack propagation from the fibre-matrix interface at lower loading levels than the nominal performance. The development and implementation of such models will enable further enhancements on the design and manufacturing of composite pressure vessels, suitable for the aerospace industry.
SPEAKER CV
Paulo Reinier Teixeira Goncalves is a researcher from the Composite Materials and Structures unit at INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering since April 2018. He has a Bachelor (2010) and a Master of science degree in Mechanical Engineering (2013) from Universidad Simón Bolívar. His research activity is focused in applied mechanical engineering and computational mechanics. For more than 10 years, he has worked in the development and implementation of material models for fracture mechanics analyses, acoustics and dynamics. Now, he is pursuing a PhD degree in the field of end-to-end simulation of fibre reinforced polymer composites since 2020.
<!–
–>