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Abstract
The elastic behaviour of porous metals under compressive stress is shown to depend upon the porosity and the development of internal stresses in the porous matrix by plastic deformation. The elastic modulus obtained from the measurement of the recoverable strain following plastic deformation is given for porous bronze and iron. The stress/strain behaviour of porous metals is similar to that of cast iron in tension, in which the graphite acts as porosity. Poisson’s ratio for porous iron was found to be between 0.2 and 0.25. A practical example of the application of the data to the force-fitting of porous metal parts into rigid housings is given.
The effect of porosity on the oil-film pressures developed in the hydrodynamic lubrication of porous metal parts is illustrated, together with the result of variable porosity and permeability in the direction of pressing.
Notes
* Manuscript received 13 May 1963. Contribution to a Symposium on “Residual Porosity in Powder Metallurgy” to be held in London on 21 and 22 October 1963.