Flat‐punch indentation of viscoelastic material

By L. Cheng, X. Xia, W. Yu, L. Scriven, W. Gerberich. 2000

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Spherical-tip indentation of viscoelastic material (2005, methodology): “Furthermore, the Laplace transform method can be used only when the interface between stress and deformation boundaries does not change with time ( Cheng et al., 2000; Lee, 1960, 1962).”
Measurement of Creep Compliance of Solid Polymers by Nanoindentation (2003, methodology): “Recently, Cheng et al. (2000) used a flat-punch indenter tip to measure the creep compliance of viscoelastic materials; this work relies on a closed form solution of the load-displacement relation for a standard”
Mechanical models for living cells--a review. (2006, unknown): “(15)) (Cheng et al., 2000; Koay et al., 2003) as”
Relationships between initial unloading slope, contact depth, and mechanical properties for conical indentation in linear viscoelastic solids (2005, methodology): “(8) and (10) for determining contact depth hc and “instantaneous” moduli, G(0)/(1 − ) or E(0)/(1 − (2)), when unloading is sufficiently fast.”