Soviet Powder Metallurgy and Metal Ceramics

, Volume 23, Issue 11, pp 881–884 | Cite as

Relaxation of thermal stresses in porous materials

  • Yu. L. Pilipovskii
Test Methods and Properties of Powder Metallurgical Materials
  • 14 Downloads

Conclusions

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.

Keywords

Viscosity Porosity Migration Compaction Thermal Stress 

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Literature cited

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    B. A. Boley and J. H. Weiner, Theory of Thermal Stresses, Wiley (1960).Google Scholar
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    V. V. Skorokhov, Rheological Fundamentals of the Theory of Sintering [in Russian], Naukova Dumka, Kiev (1972).Google Scholar
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    V. V. Skorokhov and L. I. Tuchinskii, “The condition of plasticity of porous bodies,” Poroshk. Metall., No. 11, 81–87 (1978).Google Scholar
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    M. S. Koval'chenko, Theoretical Fundamentals of the Hot Working of Porous Materials by Pressure [in Russian], Naukova Dumka, Kiev (1980).Google Scholar
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    A. T. Tumanov and K. I. Portnoi (eds.), Refractory Materials in Machine Building (Handbook) [in Russian], Mashinostroenie, Moscow (1967).Google Scholar

Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • Yu. L. Pilipovskii
    • 1
  1. 1.Institute of Problems of Material ScienceAcademy of Sciences of the Ukrainian SSRUkraine

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