Effects of heating rate on the stress-strain state in a heat-protective fiberglass material

Autor: Tret'yachenko, G. N., Gracheva, L. I., Vengzhen, V. V.
Zdroj: Strength of Materials; May 1981, Vol. 13 Issue: 5 p543-547, 5p
Abstrakt: 1.These experimental and analytical studies have shown that there is a marked effect on the deformation laws due to the physicochemical transformations in the material under conditions simulating real ones, particularly as regards the state of strain in a rod or cylindrical shell made of fiberglass bonded with phenolformaldehyde resin.2.In the range where aT is linearly dependent on temperature (T = 20–300 °C), an increase in heating rate causes a rise in the stress gradients; in the range where the behavior of aT is nonlinear (300–1000 °C), the relationship for the thermal stresses is the converse. For example, an increase in heating rate shifts the zone of maximum thermal stresses in a cylindrical shell under realistic conditions by more than 35% towards the heating surface; the maximum thermal stresses are then more than halved.3.The stresses in a rod working under one-sided heating and subject to a load providing a constant shape increase by 15–30% at high heating rates (100 deg/min) and almost by a factor three at low rates (25 deg/min).
Databáze: Supplemental Index
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