Static and Dynamic Properties of Semi-Crystalline Polyethylene
Stronge, William J
Multidisciplinary Digital Publishing Institute
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Xu, M., Huang, G., Feng, S., McShane, G., & Stronge, W. J. (2016). Static and Dynamic Properties of Semi-Crystalline Polyethylene. Polymers, 8 (77)https://doi.org/10.3390/polym8040077
Properties of extruded polymers are strongly affected by molecular structure. For two different semi-crystalline polymers, low-density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE), this investigation measures the elastic modulus, plastic flow stress and strain-rate dependence of yield stress. Also, it examines the effect of molecular structure on post-necking tensile fracture. The static and dynamic material tests reveal that extruded UHMWPE has a somewhat larger yield stress and much larger strain to failure than LDPE. For both types of polyethylene, the strain at tensile failure decreases with increasing strain-rate. For strain-rates 0.001–3400 s^-1, the yield stress variation is accurately represented by the Cowper–Symonds equation. These results indicate that, at high strain rates, UHMWPE is more energy absorbent than LDPE as a result of its long chain molecular structure with few branches.
extruded polyethylene, plastic flow, molecular structure, mechanical behavior, split Hopkinson bar
This work was partially sponsored by Foundation of State Key Laboratory of Explosion Science and Technology of China under Grant No.KFJJ13-1Z, No. YBKT15-02 and Natural Science Foundation of China under Grant No.11102023. The authors would like to thank Chunmei Liu of the First Research Institute of the China Ministry of Public Security for assistance with the static tensile tests.
External DOI: https://doi.org/10.3390/polym8040077
This record's URL: https://www.repository.cam.ac.uk/handle/1810/254907
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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