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PDMS micropost arrays to engineer substrate stiffness. (a) Graphical depiction of finite-element method (FEM) analysis of micropost of heights (H) each bending in response to applied horizontal traction force (F) of 20nN. (b) Normal spring constant (K) as a function of H, as computed from FEM analysis (bars) and from Euler-Bernoulli beam theory (curve). K measures micropost stiffness (rigidity).
