Relaxation of thermal stresses in porous materials
- 14 Downloads
Porous materials possess an increased capacity for relaxation of thermal stresses as the result of an irreversible change in volume (most probably as the result of compaction in the hot zone by migration of the material into the voids under the action of compressive stresses).
The capacity for relaxation increases with a decrease in the volume share of the skeleton, which is related to the sharp decrease in the coefficient of effective viscosity of the material, which determines the capacity of a porous material for deformation.
The thermal resistance of porous materials may be increased by creation of the optimum porosity of the skeleton structure taking into consideration the necessary strength characteristics.
KeywordsViscosity Porosity Migration Compaction Thermal Stress
Unable to display preview. Download preview PDF.
- 1.B. A. Boley and J. H. Weiner, Theory of Thermal Stresses, Wiley (1960).Google Scholar
- 2.V. V. Skorokhov, Rheological Fundamentals of the Theory of Sintering [in Russian], Naukova Dumka, Kiev (1972).Google Scholar
- 3.V. V. Skorokhov and L. I. Tuchinskii, “The condition of plasticity of porous bodies,” Poroshk. Metall., No. 11, 81–87 (1978).Google Scholar
- 4.M. S. Koval'chenko, Theoretical Fundamentals of the Hot Working of Porous Materials by Pressure [in Russian], Naukova Dumka, Kiev (1980).Google Scholar
- 5.A. T. Tumanov and K. I. Portnoi (eds.), Refractory Materials in Machine Building (Handbook) [in Russian], Mashinostroenie, Moscow (1967).Google Scholar