Research on the Strain Rate Effect of Rigid Polyurethane Foam

doi:10.3901/JME.2023.16.192

Abstract

Abstract: The dynamic compression experiments with a strain rate ranging from 1 000 s^-1 to 2 300 s^-1 were carried out on rigid polyurethane foam（RPUF） using a split Hopkinson pressure bar（SHPB） with a diameter of 37 mm. The experimental results show that the RPUF material has obvious strain rate effect. The RPUF material is regarded as an ideal elastoplastic model without strain rate effect, and the finite element software ABAQUS is used to carry out the numerical simulation of the SHPB experiment of the RPUF material. The simulation results show that the dynamic yield stress of the RPUF material increases significantly with the increase of the strain rate. Therefore, the influence of the transverse inertia effect on the experimental results cannot be ignored. Then, the triaxial confining pressure（1 MPa, 2 MPa, 5 MPa and 10 MPa） tests of RPUF material were carried out. The experimental results show that the yield stress of RPUF material is linear with the hydrostatic pressure. Therefore, the hydrostatic effect of the material itself needs to be considered when studying the strain rate effect of RPUF material. In order to obtain the actual strain rate effect of RPUF material,based on the experimental data of SHPB and triaxial confining pressure, a constitutive model including hydrostatic pressure effect and strain rate effect was proposed and applied to the SHPB numerical simulation of RPUF material. Although this method eliminates the effect of material hydrostatic pressure on the experimental results, the simulation result is still larger than the experimental value. This is because the influence of the transverse inertia effect on the experiment is not eliminated in the numerical simulation. The material parameters were corrected by introducing the correction coefficient of the transverse inertia effect, and the simulation results are in good agreement with the experimental data, indicating that the proposed constitutive model and the corrected material parameters can truly reflect the mechanical properties of the RPUF material itself, thus obtaining the actual strain rate effect of RPUF material.

Key words: rigid polyurethane foam, strain rate, transverse inertia effect, hydrostatic effect, constitutive relationship

CLC Number:

TB324

LIU Huan, HUANG Ruiyuan, JIANG Dong, QIN Jian, WEN Yanbo, ZHANG Yanze. Research on the Strain Rate Effect of Rigid Polyurethane Foam[J]. Journal of Mechanical Engineering, 2023, 59(16): 192-203.

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