We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Fracture of Epoxy Matrixes Modified with Thermo-Plastic Polymers and Winding Glass Fibers Reinforced Plastics on Their Base under Low-Velocity Impact Condition
Summary
This paper is not about microplastics — it investigates the mechanical and fracture properties of epoxy composites reinforced with thermoplastic polymers and glass fibers.
The work is aimed at studying the impact resistance of epoxy oligomer matrices (EO) modified with polysulfone (PSU) or polyethersulfone (PES) and glass fibers reinforced plastics (GFRP) based on them under low-velocity impact conditions. The concentration dependences of strength and fracture energy of modified matrices and GFRP were determined. It has been determined that the type of concentration curves of the fracture energy of GFRP depends on the concentration and type of the modifying polymer. It is shown that strength σ and fracture energy EM of thermoplastic-modified epoxy matrices change little in the concentration range from 0 to 15 wt.%. However, even with the introduction of 20 wt.% PSU into EO, the strength increases from 164 MPa to 200 MPa, and the fracture energy from 32 kJ/m2 to 39 kJ/m2. The effect of increasing the strength and fracture energy of modified matrices is retained in GFRP. The maximum increase in shear strength (from 72 MPa to 87 MPa) is observed for GFRP based on the EO + 15 wt.% PSU matrix. For GFRP based on EO + 20 wt.% PES, the shear strength is reduced to 69 MPa. The opposite effect is observed for the EO + 20 wt.% PES matrix, where the strength value decreases from 164 MPa to 75 MPa, and the energy decreases from 32 kJ/m2 to 10 kJ/m2. The reference value for the fracture energy of GFRP 615 is 741 kJ/m2. The maximum fracture energy for GFRP is based on EO + 20 wt.% PSU increases to 832 kJ/m2 for GFRP based on EO + 20 wt.% PES-up to 950 kJ/m2. The study of the morphology of the fracture surfaces of matrices and GFRP confirmed the dependence of impact characteristics on the microstructure of the modified matrices and the degree of involvement in the process of crack formation. The greatest effect is achieved for matrices with a phase structure "thermoplastic matrix-epoxy dispersion." Correlations between the fracture energy and strength of EO + PES matrices and GFRP have been established.
Sign in to start a discussion.
More Papers Like This
Adaptation of the Microplane Constitutive Model for Brittle-plastic Glassy Polymers
This engineering study adapted a microplane constitutive model, originally developed for concrete, to simulate the mechanical damage behavior of glassy polymers under tension and compression. The model accurately captures deformation behaviors including post-peak hardening and softening in brittle-plastic polymer materials.
Characterization of Hybrid FRP Composite Produced from Recycled PET and CFRP
This paper is not about microplastics — it characterizes the mechanical properties of recycled carbon fiber composites made with PET plastic waste for structural applications.
Macro-, Micro- and Nanomechanical Characterization of Crosslinked Polymers with Very Broad Range of Mechanical Properties
This study compared the mechanical properties of crosslinked polymer networks at macro, micro, and nanoscale, finding that properties measured at different scales are highly correlated in well-defined systems. This materials science research is relevant to understanding how plastic polymers fracture and fragment under mechanical stress, a key step in microplastic formation.
Comparative analysis of self‐cure and dual cure‐dental composites on their physico‐mechanical behaviour
This paper is not about microplastic pollution. It compares the physical and mechanical properties of self-cure and dual-cure dental composite materials, examining how filler content, resin monomers, and particle size affect hardness, strength, fracture toughness, and degradation of dental restorations.
Brittle materials at high-loading rates: an open area of research
This paper reviews how brittle materials like ceramics, rocks, and concrete behave when subjected to high-speed impacts and explosive loading, identifying knowledge gaps in understanding their fracture behavior. This materials science study is focused on engineering and defense applications and has no direct relevance to microplastics research.