Experimental and theoretical study of stress relaxation in high-density polyethylene
- Post by: Tobias Larsson
- 24th June 2024
- No Comment
Abstract
Stress relaxation of high-density polyethylene is addressed both experimentally and theoretically. Two types of stress relaxation testing are carried out: uniaxial tensile testing at constant test specimen length and compression testing of a 3D structure producing inhomogeneous deformation fields and relaxation. A constitutive model for isotropic, semi-crystalline polymers is also proposed. The model has the ability to model stress relaxation at different time scales. The developed model was implemented as a user subroutine in Abaqus (UMAT). The implicit integration scheme including an algorithmic tangent modulus is described in detail. The material model is calibrated by use of the uniaxial tensile tests, and the model is then validated by simulating the compression tests of the 3D structure. The model is able to describe the uniaxial tension tests well, and the comparison between the simulations and experimental testing of the 3D structure shows very good agreement.
Keywords
Compression testing, Polyethylenes, Tensile testing, Well testing, 3D Structure, Deformation field, High-density polyethylenes, Inhomogeneous deformation, Isotropics, Semi-crystalline polymer, Specimen length, Test specimens, Theoretical study, Uniaxial tensile testing, Stress relaxation
Citation
Kroon, M., Görtz, J., Islam, S. et al. Experimental and theoretical study of stress relaxation in high-density polyethylene. Acta Mech 235, 2455–2477 (2024). https://doi.org/10.1007/s00707-024-03851-z