Figure 6.

Normalized contact radii ψ and ψ′ as a function of normalized applied force $F/\pi \hat{R}w$ of a simulated S180 DPA pull-off experiment (parameters in Table 1) and for w = 0.6 nN/μm, compared to (a) DMT, (b) JKR, and (c) BWdG limits. For solid elastic spheres (JKR and DMT), we assume that R_a ≈ R. Dashed lines indicate where contact is not stable and rupture of the cell doublet will occur. Different guide lines are shown (from top to bottom at F = 0) for DMT: ${\hat{E}}_{\text{cell}}$ (Pa) ∈ {100, 200, 300, 400, 500}; for JKR: ${\hat{E}}_{\text{cell}}$ (Pa) ∈ {400, 600, 800, 1000, 1200}; and for BWdG: γ (nN/μm) ∈ {0.6, 0.8, 1.0, 1.2, 1.4}. To see this figure in color, go online.