Tailored flax-reinforced compositesBencze, Andrei (Avtor) Bergant, Zoran (Avtor) Arnăutu, Irina (Avtor) Šturm, Roman (Avtor) Chlada, Milan (Avtor) Steigmann, Rozina (Avtor) Stanciu, Mariana Domnica (Avtor) Savin, Adriana (Avtor) biocompositesflax fibersflax-reinforced compositessustainabilitymechanical propertiesdynamic mechanical analysisTailored flax-reinforced composites (TFRC) are being investigated as a sustainable alternative to conventional glass- and carbon-fiber-reinforced composites, having a lower fiber volume than these and the structure of the laminate with two plies (two identical layers of alkali-treated flax yarns) is unidirectional, weakly twisted, oriented at ±45°, and reinforced by stitching; it is also impregnated with bio-resin and has robust reinforcement through controlled lamination. TFRC has shear-dominated behavior under both tensile and compressive loading, due to the off-axis orientation of the fibers, but the damage evolution differs significantly. Under tensile loading, the material exhibits a lower strength (55.2 MPa), whereas under compression loading, the composite achieves a higher apparent strength (99.1 MPa). The paper provides a comprehensive analysis for structural and mechanical characterization using the following: nondestructive evaluation using ultrasound to detect internal discontinuities and assess homogeneity; optical microscopy to evaluate fiber–matrix integration and porosity reduction; and Dynamic Mechanical Analysis to assess thermomechanical transitions and storage modulus stability. Finite element simulations have been used to determine elastic properties and validate the matrix-dominated shear response. The results confirm that the [±45°]4S sequences of TFRC optimize mechanical response and interfacial adhesion, promoting TFRC as an ecological solution for structural systems where progressive energy dissipation is preferred.20262026-08-26 11:44:57Članek v reviji186063UDK: 66.02ISSN pri članku: 2073-4360DOI: 10.3390/polym18172069COBISS_ID: 288947971sl