Comparative Study Of Heat Supply Techniques And Their Effect On Thermal Deformation In Composite Shield Materials
Shevchenko Oleksii Mykhailovych
G. S. Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kiev 01014, Ukraine.
Bondarenko Iryna Volodymyrivna
G. S. Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kiev 01014, Ukraine.
Abstract
This study examines the thermal deformation behavior of a fiberglass composite polymer material, specifically a phenol-formaldehyde matrix, under various heating conditions. The material is subjected to uniform and one-sided heating at rates up to 600°C/min, with a high-temperature gas flow reaching 2500°C. The research focuses on the kinetics of thermal deformation, assessing how different heating rates and temperatures impact the composite material. The analysis involves computing the stressed-deformed state of reinforced plastic samples to measure their expansion under one-sided heating. Findings reveal that the coefficient of thermal deformation (αT\alpha_TαT) shows a linear dependence on temperature and stresses, which helps in preventing bending in free samples. Conversely, for bent samples, the absence of a stress gradient (Δσ=0\Delta\sigma = 0Δσ=0) at higher heating rates results in increased stress gradient values. Comparative data from dilatometry tests, conducted across a temperature range of 20 to 1100°C, corroborate these observations, providing insights into the material's response to thermal and mechanical loads.