Multi-criteria evaluation of glass-basalt composites based on fractal geometry

The object of research is the properties of glass-basalto-plastic composite pipes and their relationship with composition and structure. The purpose of this work is to analyze the influence of the composition and structure of glass-basalto-plastic composite pipes on their physical-mechanical properties. Method. Physical experiments are conducted to measure and analyze the physico-mechanical properties of the glass-basalto-plastic composite pipes. These experiments include tests for the tensile strength in the circumferential direction, compressive strength, and axial modulus of elasticity in tension. The methodology involves the use of a combined expert system and active experimentation to derive a mathematical model. The proposed approach is validated at a specified level of service characteristics of the glass-basalto-plastic pipes. The impact of the selected composition parameters on the objective function is evaluated by analyzing the coefficients of equations in normalized units. Histograms describing the degree of influence of each parameter on the objective function (the physical-mechanical properties) are obtained. Results. The study reveals that the greatest influence on the strength indicators and modulus of elasticity is exerted by: 1) the percentage content of rovings X1, as the main material of the pipes (composite matrix), characterized by high properties, which contributes 87.5 units compared to other parameters X; 2) the diameter of fibers X2, which also has a significant influence on the properties under consideration. The degree of influence of the composition and structure elements on tensile strength is 41.250 units. The total contribution of the binder components amounts to 13.750 units. The structural influence comprises 15.0 units, with 7.5 units each from the fractal dimension of the matrix fiber and the fractal dimension of the binder. The results can be used for the rapid analysis of the physico-mechanical properties of glass-basalt-plastic pipes within the operational parameter range.

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