Study on visco⁃elastic⁃plastic deformation of PE⁃UHMW under thermal⁃mechanical coupling

doi:10.19491/j.issn.1001-9278.2025.09.002

Abstract

Abstract:

In this study， the visco⁃elastic⁃plastic deformation behavior of ultra⁃high⁃molecular⁃weight polyethylene （PE⁃UHMW） were systematically investigated under thermo⁃mechanical coupling conditions. Through comprehensive mechanical characterization including elastic modulus measurements， creep tests， and stress relaxation analysis， the temperature⁃dependent evolutions of key parameters， including tensile modulus， viscosity coefficient， and relaxation time， were quantified. Experimental results indicated a significant thermo⁃sensitive behavior， with the tensile modulus decreasing from 134.26 to 20.96 MPa， viscosity coefficient from 325.61 to 224.66 GPa·s， and relaxation time from 937.83 to 830.29 s as temperature increased from 50 to 120 °C. A novel parallel physical model combining spring， Kelvin， and viscous pot elements was developed to accurately describe the deformation mechanisms under constant strain conditions. This model provides fundamental insights into the complex visco⁃elastic⁃plastic behavior of PE⁃UHMW， establishing quantitative relationships between thermal conditions and mechanical response.

Key words: ultra?high?molecular?weight polyethylene, visco?elastic?plastic deformation, creep strain, stress relaxation

CLC Number:

TQ325.1⁺2

NIU Kai, ZHANG Run, LIU Mingfei, FU Chenchao, XUE Ping, WU Jiajun. Study on visco⁃elastic⁃plastic deformation of PE⁃UHMW under thermal⁃mechanical coupling[J]. China Plastics, 2025, 39(9): 7-11.

Figures/Tables 11

Fig.1. Stress⁃strain curves and linear fitting at different temperatures

温度/℃	50	80	100	110	120
拉伸弹性模量E/MPa	134.26±4.16	42.31±1.52	33.88±1.29	24.15±1.34	20.96±1.4

Tab.1. Tensile modulus of elasticity of PE⁃UHMW at different temperatures

Fig.2. Temperature dependent data and nonlinear fitting curve of PE⁃UHMW tensile modulus of elasticity

Fig.3. Strain⁃time curves of PE⁃UHMW under different temperatures and stresses

温度/℃	应变	应力/MPa
温度/℃	应变	0.5	1	1.5	2
50	蠕变应变	0.63	1.32	2.72	3.51
50	残余应变	0.13	0.29	0.41	0.54
80	蠕变应变	1.17	1.99	4.10	7.29
80	残余应变	0.17	0.32	0.51	0.74
100	蠕变应变	0.94	2.50	4.02	7.46
100	残余应变	0.15	0.41	0.49	0.59
120	蠕变应变	1.27	2.52	3.75	7.96
120	残余应变	0.22	0.39	0.58	0.77

Tab.2. %Creep strain and creep residual strain of PE⁃UHMW under different temperatures and stresses

Fig.4. The viscosity coefficient of PE⁃UHMW varies with temperature and linear fitting

Fig.5. Stress relaxation curve of PE⁃UHMW

温度/℃	50	80	100	110	120
应力松弛时间/s	937.83	872.02	865.26	858.15	830.29

Tab.3. Stress relaxation time of PE⁃UHMW at different temperatures

Fig.6. The relaxation time of PE⁃UHMW varies with temperature and linear fitting

Fig.7. The variation of plastic strain of PE⁃UHMW with creep strain and linear fitting

Fig.8. Physical model of visco⁃elastic⁃plastic deformation process of PE⁃UHMW under thermal⁃mechanical coupling

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