Methods of obtaining instantaneous modulus of viscoelastic solids using displacement-controlled instrumented indentation with axisymmetric indenters of arbitrary smooth profiles

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:423

Article; Proceedings Paper

Cheng, Yang-Tse ; Cheng, Che-Min ; Ni, Wangyang

关键词: indentation;    viscoelastic solids;    instantaneous modulus;   

DOI  :  10.1016/j.msea.2005.09.134

来源: Elsevier

【 摘 要 】

We derive a relationship between the initial unloading slope, contact depth, and the instantaneous relaxation modulus for displacement-controlled indentation in linear viscoelastic solids by a rigid indenter with an arbitrary axisymmetric smooth profile. While the same expression is well known for indentation in elastic and in elastic-plastic solids, we show that it is also true for indentation in linear viscoelastic solids, provided that the unloading rate is sufficiently fast. When the unloading rate is slow, a hold period between loading and unloading can be used to provide a correction term for the initial unloading slope equation. Finite element calculations are used to illustrate the methods of fast unloading and hold-at-the-maximum-indenter-displacement for determining the instantaneous modulus using spherical indenters. (c) 2006 Elsevier B.V. All rights reserved.

【 授权许可】

Free