RT Journal Article
T1 On the effect of geometrical fiber arrangement on damage initiation in CFRPs under transverse tension and compression
A1 Marco Esteban, Miguel
A1 Giner, Eugenio
A1 Miguélez Garrido, María Henar
A1 González, David
AB The mechanical performance of composite materials is strongly dependent on its microstructure. Efficientdesign of composites requires proper estimation of the effect of the microstructure on residual stresses that arisingfrom cooling due to manufacturing temperature. The study of the stresses and damage in fibres interfaceand its relationship with geometrical distribution of the fibres can contribute to a better comprehension ofthe mechanical response of the composite.We use 2D numerical models to represent a composite material reinforced with longitudinal fibres. Themechanical behaviour is analysed taking into account the cooling effect and tension/compression transverseloading. We have generated a range of virtual microstructures, characterized by the microstructure randomness,to study the influence of the fiber randomness on the damage initiation. Damage initiation at fibres interfaceshas been estimated from the stresses induced at the interface, both in the whole structure and forindividual fibers.As expected, a strong effect of the randomness of the fiber arrangement on the damage initiation has beenfound. For all microstructures and loading modes, higher values of microstructure randomness results in earlierdamage development. Normal and shear stresses at individual fibre interfaces have been analysed under tensionand compression loading. In tension, normal stress at the fiber interface fully dominates the interfacialdamage initiation. In compression, damage is almost completely dominated by the interfacial tangential stress.In compression, localized plasticity develops simultaneously with damage initiation whereas in tension, damageinitiation occurs at a stress three times lower than the required for the onset of plasticity. The maximumshear and normal stresses around individual fibers are strongly affected by the local neighborhood.
PB Elsevier
SN 0263-8223
YR 2021
FD 2021-10-15
LK https://hdl.handle.net/10016/35591
UL https://hdl.handle.net/10016/35591
LA eng
NO The authors gratefully acknowledge the funding support received from the Spanish Ministerio de Ciencia e Innovación and the FEDER operation program for funding the projects DPI2017‐89197‐C2‐1‐R and DPI2017‐89197‐C2‐2‐R.
DS e-Archivo
RD 1 sept. 2024