Experimental and numerical investigations of low energy/velocity impact damage generated in 3D woven composite with polymer matrix

Abstract

International audience3D woven composite materials have been recently used to design some engine structures in order to improve their impact resistance. The aim of this work is to study experimentally and numerically low-velocity/energy impact damage in such recent composites. Impact tests at different energy levels have been performed and analysed using microscopic observations and X-ray tomography in order to understand damage mechanisms occurring in this material. Finite element simulations have been performed using the continuum damage model, ODM-PMC, developed at Onera for 3D woven composites under static loadings. Through comparisons with the available experimental data, it has been demonstrated that the damage mechanisms are described correctly by the present model. Moreover, the residual depth after impact is also accurately predicted, allowing to generate, numerically, relations between impact energy, damaged area and residual depth, currently determined experimentally in aeronautical industries

Reprocessable Thermoset Soft Actuators

“…Thee xisting polymeric net-like structures are made by binding strips together to multi-layer,w hich tend to delaminate after repeated use. [16] Besides pure LCETs,L CET composites can also be reprocessed to produce 3D soft actuators by this method. They provide af easible approach to reprocess LCETs by other stimuli, such as light.…”

Reprocessable Thermoset Soft Actuators

“…Welding aligned LCET strips together provides a simple method to build net‐like actuators, whose pores enlarge in the liquid‐crystal phase and shrink in the isotropic phase (Figures e,f). The existing polymeric net‐like structures are made by binding strips together to multi‐layer, which tend to delaminate after repeated use …”

Multiaxial loading on a 3D woven carbon fiber reinforced plastic composite using tensile-torsion tests : Identification of the first damage envelope and associated damage mechanisms

“…As a consequence, a consistent effort is currently performed concerning the comprehension of the mechanical behavior and the damage mechanisms encountered in such 3D woven composites materials. Most of these studies concern uni-axial quasi-static [4][5][6][7][8][9][10], fatigue [11][12], and impact [13][14] loadings, but very few works have been carried out on multi-axial loadings applied to 3D woven composites [15].…”