Abstract
The strain rate sensitivity for Teflon 7C porous bed compaction has been evaluated from stress relaxation measurements on quasi-statically ( ɛ ˙ ≈ 10 − 3 s − 1 ) compacted powder. Applying the Lee and Hart formalism for stress relaxation in non-porous materials to the compaction of porous beds resulted in logarithmic plots of the so-called “intragranular stress” (average axial compressive force per unit radial cross-sectional area of the solids in the bed) versus plastic strain rate. These plots were extrapolated to predict stress levels at strain rates characteristic of dynamic ( ɛ ˙ ≥ 10 − 3 s − 1 ) compaction. Estimates at about 81.5, 85, and 92% TMD compare favorably to dynamic measurements on Teflon 7C by Sandusky and Liddiard.
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