A non-linear viscoelastic material model with progressive damage based on microstructural evolution and phase transition in polycrystalline ice for design against ice impact. (April 2023)

• Record Type: Journal Article
• Authors: Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen
• Is Part Of: International journal of impact engineering. Volume 176(2023)
• Publication Date: 2023-04
• Subjects: Ice impact -- Rate-dependent material -- Material model -- Damage model -- Viscoelasticity -- Multiphysics; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2023.104563
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: A viscoelastic material model with progressive damage for ice under impact loading. Iterative algorithm for pressure- and rate-dependent progressive damage. The model is implemented with Lagrangian FEM, coupled FEM-SPH, and ALE-FEM. Validation against physical creep and ice crushing tests with various speeds. Modelling cyclic transition from solid-like intact to fluid-like viscous crushed ice. Abstract: This study presents a nonlinear viscoelastic material model incorporating a progressive damage framework with an iterative algorithm for glacial/freshwater polycrystalline ice subject to compressive impact load induced by ice-structure interaction. The damage model accounts for microcracking, dynamic recrystallisation, pressure melting, and high-shear elastic failure with a pressure- and rate-dependent convex failure locus. The constitutive laws are written in Fortran and implemented as a vectorised user material (VUMAT) in Abaqus with three different numerical methods, Lagrangian FEM, coupled FEM-SPH, and ALE-FEM. The constitutive model together with the implemented numerical methods are validated against two different types of laboratory-scale physical tests, indentation of cone-shaped ice and triaxial creep. The proposed model implemented with the coupled FEM-SPH method enables simulation of the cyclic transition from solid-like intact ice to the fluid-like pulverised/granular substance, progressively extruded with viscous rheology.