CHAPTER 6: MECHANICAL PROPERTIES
CHAPTER 6: MECHANICAL PROPERTIES
CHAPTER 6: MECHANICAL PROPERTIES
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7.12 INFLUENCE OF POROSITY ON THE<strong>MECHANICAL</strong> <strong>PROPERTIES</strong> OF CERAMICSPowder as precursorAluminum oxideE = Eo(1 – 1.9P + 0.9P 2 )Compaction to desire shapePores or voids eliminationincompleteResidual porosity remainsDeleterious influence onelasticity and strengthVolume fraction porosity PEo = modulus of elasticity ofthe non porous material-Pores reduce the area-Pores are stress concentrators-tensile stress doubles in anisolated spherical poreAluminum oxideσ fs = σ o e -nP
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