TY - JOUR
T1 - A highly efficient explicit constitutive model for linear viscoelastic closed-cell porous materials
AU - Yang, Pingping
AU - Guo, Zaoyang
AU - Hu, Ning
AU - Sun, Weifu
AU - Chen, Yang
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/9/29
Y1 - 2022/9/29
N2 - In this paper, a highly efficient explicit constitutive model for linear viscoelastic closed-cell porous materials is proposed based on micromechanics and homogenization method in the time domain. The deformation first is additively divided into volumetric and deviatoric parts and then the viscoelastic behaviors are decomposed into the time-dependent and time-independent parts. Finite element simulations based on representative volume element models are utilized to numerically verify the constitutive model. The effects of the void-shape, porosity, elastic and viscous parameters of the matrix, strain rate, and angular frequency on the effective linear viscoelastic responses are studied. The results demonstrate that the constitutive model can provide accurate estimation of the effective linear viscoelastic properties for the closed-cell porous materials in both time and frequency domains. The 3D printed nylon porous materials with various porosities are employed to experimentally validate the constitutive model through simple uniaxial compression tests, stress relaxation uniaxial compression tests, and uniaxial compression tests with different strain rates. The results reveal that the constitutive model can also predict well the behaviors of linear viscoelastic closed-cell porous materials with different porosities in the time domain under various loading conditions.
AB - In this paper, a highly efficient explicit constitutive model for linear viscoelastic closed-cell porous materials is proposed based on micromechanics and homogenization method in the time domain. The deformation first is additively divided into volumetric and deviatoric parts and then the viscoelastic behaviors are decomposed into the time-dependent and time-independent parts. Finite element simulations based on representative volume element models are utilized to numerically verify the constitutive model. The effects of the void-shape, porosity, elastic and viscous parameters of the matrix, strain rate, and angular frequency on the effective linear viscoelastic responses are studied. The results demonstrate that the constitutive model can provide accurate estimation of the effective linear viscoelastic properties for the closed-cell porous materials in both time and frequency domains. The 3D printed nylon porous materials with various porosities are employed to experimentally validate the constitutive model through simple uniaxial compression tests, stress relaxation uniaxial compression tests, and uniaxial compression tests with different strain rates. The results reveal that the constitutive model can also predict well the behaviors of linear viscoelastic closed-cell porous materials with different porosities in the time domain under various loading conditions.
KW - Closed-cell porous materials
KW - Constitutive model
KW - Homogenization method
KW - Linear viscoelastic
KW - Representative volume element
UR - http://www.scopus.com/inward/record.url?scp=85135377201&partnerID=8YFLogxK
U2 - 10.1016/j.compscitech.2022.109647
DO - 10.1016/j.compscitech.2022.109647
M3 - Article
AN - SCOPUS:85135377201
SN - 0266-3538
VL - 228
JO - Composites Science and Technology
JF - Composites Science and Technology
M1 - 109647
ER -