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Considers the complexity of a problem of thread’s rheological properties evaluation, and evaluates the visco‐elastic properties of a thread on the basis of static tests using numerical methods. Describes a new software package VILKUS which was designed and programmed for this purpose. This program calculates parameters needed for the evaluation of visco‐elastic properties on the basis of numerical values of a stress‐deformation σ(ε) curve. The stress‐deformation σ(ε) curve served as a starting‐point for evaluation of visco‐elastic properties of threads. The B‐spline approximation using the least squares method was chosen as an appropriate and suitably smooth curve for construction of the average σ(ε) curve.

In this work the study of yield point of thread and stress in flow point is shown. The determination of this point is done with the well‐known Meredith’s and Coplan’s construction, which has the basis in tangent method and numerical method, which is developed from sufficient smooth approximation of the curve. The approximation polynomial expression of the ninth order was chosen for the construction of the mean curve σ (ε) which, as the sufficiently smooth curve, fits the measured values.

The paper presents the objective evaluation and prediction of properties of a fused panel. A system for automatic knowledge acquisition from a given set of examples presents an alternative way to build a knowledge base to determine the quality of a fused panel. On the basis of analyses of influential factors of fused panel quality the learning and testing set of examples to predict the bonding strength of fused panel has been formed.