Modeling nonlinear viscoelastic nanoindentation of PVAc at different unloading rates

Kucuk, Yilmaz (avtor)

In this study, nanoindentation technique was used to determine the nonlinear viscoelastic behavior of polyvinyl acetate (PVAc) with a glass transition temperature of 29 °C. Nanoindentation was conducted with a Berkovich nanoindenter tip under the same constant loading rate but different unloading rates. The Burgers nonlinear viscoelastic model was implemented in ABAQUS/Standard finite element code by means of a user-defined subroutine. After fitting the complete load-displacement curves, parameters in the nonlinear Maxwell and Voigt elements were obtained to describe the nonlinear viscoelastic behavior of PVAc. The results show that PVAc exhibits negative unloading stiffness under low unloading rates. However, if the unloading rate is higher than 0.1 mN/s, PVAc appears more elastic behavior. The nonlinear Burgers model used can successfully model the nonlinear viscoelastic behavior of PVAc at different unloading rates, including the unloading nose associated with negative unloading slope at slow unloading rate for a highly viscoelastic material.

• Jezik: Angleški jezik
• Ključne besede: nanolinear viscoelastic nanoindentation, PVAc, viscoelasticity, finite element simulation, FEM, nonlinear Burgers model
• Vrsta gradiva: Delo ni kategorizirano (r6)
• Tipologija: 1.03 - Kratki znanstveni prispevek
• Organizacija: FS - Fakulteta za strojništvo
• Leto izida: 2013
• Št. strani: str. 418-422, SI 74
• Številčenje: Vol. 59, no. 6
• UDK: 544.236.4
• ISSN pri članku: 0039-2480
• DOI: 10.5545/sv-jme.2012.648
• COBISS.SI-ID: 13075227
• Skupna ocena: (0 glasov)
• Vaša ocena: Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.

Gradivo je del revije

• Naslov: Strojniški vestnik
• Skrajšan naslov: Stroj. vestn.
• Založnik: Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: nanoindentacija, PVAc, viskoelastičnost, metoda končnih elementov, FEM, nelinearni Burgesov model