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(Color online) Fatigue behavior of polyacrylamide gel: (a) The critical stress softening αc for different gel viscosities: bubble dynamics model • (red) and – – (blue) Eq. (41); and (b) The maximum bubble radius — (red), and damage zone thickness – – (blue) for μ = 3.0 Pa s and α = 0.4 after stress softening with exposures.
