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Creep correction of elastic modulus and hardness for viscoelastic materials during microindentation
Author(s) -
Liu Erqiang,
Kong Lingyu,
Xiao Gesheng,
Lin Jinbao,
Zhao Guanghui,
Li Huaying
Publication year - 2021
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.5142
Subject(s) - creep , materials science , viscoelasticity , indentation , composite material , modulus , dimensionless quantity , displacement (psychology) , constant (computer programming) , elastic modulus , deformation (meteorology) , thermodynamics , physics , computer science , psychology , psychotherapist , programming language
In this paper, a dimensionless creep correction factor is proposed to simplify the calculation by using a fitting function of creep displacement combined with reduced modulus formula. Using experimental results of PA12 under different testing conditions during indentation, the creep‐corrected calculations of contact depth, reduced modulus, and hardness are studied. Results show that the elastic modulus without creep correction is significantly over‐estimated, while the creep‐corrected elastic modulus is a constant value (1.25 GPa) which does not change with the test variables. Conversely, the nanohardness extracted by the conventional approach is under‐estimated and the creep‐corrected contact hardness is not constant due to the time‐dependent deformation. The introduction of creep correction factor can significantly simplify the correction calculation process of material parameters.