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The paper describes a mathematical model of the stress-strain state of polymer composite materials in the pultrusion process of large-sized products. The influence of the pull speed on the stress-strain state of the products is investigated. To determine the maximum possible pull speed series of solutions at different pull speeds are obtained. Depending on the maximum strain in the cross section of the rod determined the optimal value of pulling speed

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A mathematical model to describe the pressure distribution in a thermoset large-sized composite rod as it travels through the pultrusion die is developed on the basis of Darcy’s law. A finite-difference method is employed to solve the governing equations of three-dimensional axis-symmetric cylindrical die geometry. The influence of pre-heating on pressure rise inside a cylindrical die inlet is investigated. The present model may be utilized to obtain the optimal linear taper angle for die inlet and process conditions to achieve maximum possible pressure rise in the die inlet.

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