Design and Manufacturing of a Textile-Based Auxetic Composite Core
摘要
Composite materials, known for their exceptional mechanical performance-to-weight ratio, are increasingly used in the aerospace and defense sectors. Additionally, innovative technologies like the open rotor (with possible increased fuselage impact situations) are being integrated to mitigate aircraft fuel consumption. This evolution introduces new design challenges, particularly concerning energy absorption during impacts. Several studies indicate that auxetic materials may exhibit promising properties for impact resistance. Auxetic materials have a negative Poisson’s ratio, which causes it to expand or contract laterally under longitudinal tensile or compressive stress, respectively. In compression, this results in material densification, enhancing mechanical properties such as indentation resistance, shear modulus and energy absorption capability. Consequently, these materials emerge as viable options for enduring impact loads. Most auxetic structures are typically studied experimentally using foams or additively manufactured materials. The latter option offers advantages such as precise geometry but has drawbacks due to its layer-by-layer construction process. Technical textiles are renowned for their ability to absorb energy during impact events due to their high resilience and deformability. By manufacturing auxetic structures from technical textile-reinforced composites, both energy absorption capabilities may be synergized. The aim of this work is to design and carry out a feasibility study on such a composite reinforcement. This involves a study of the weaving pattern to obtain the auxetic geometry, the choice of yarns and control of their tension to allow the consolidation of the reinforcement into a composite material, and the verification of the correct geometry through a profilometric analysis.