Abstract: Within the quasi-static range, tensile test at different strain rates was conducted on rigid polyurethane, and the correlation between the strain rate and its deformation behavior as well as mechanical performance was analyzed according to the stress-strain curve. Meanwhile, its fai-lure mechanism was analyzed through observing the fracture morphology of the test sample, and the relationship between the strain rate and the elastic modulus as well as yield strength of materials was fitted with Eyring theory. The results show that, within the experiment scope, the elastic modulus and yield strength of materials increase rapidly and they tend to be stable with the increase of strain rate, which conforms to the logarithmic relation of Eyring theory. Besides, the extensibility decreases remarkably till there is no remarkable forced high-elastic deformation. The material deformation behavior transits from the dominance of macromolecular chain in the soft segment, collaboration of soft and hard segments, and dominance of the hard segment. According to the research results, the strain rate shall be greater than 0.33·10-3 s-1 while measuring the elastic modulus of rigid polyurethane, and greater than 1.52×10-3 s-1 while measuring the yield strength. This paper aims to further reveal the impact of strain rate sensitivity on the performance of polyurethane resin material, so as to provide references for related research and engineering practice.
1 Yu S S, Lu Y B, Cai Y. Chinese Journal of Solid Mechanics, 2013, 33(S1), 63(in Chinese). 于水生, 卢玉斌, 蔡勇. 固体力学学报, 2013, 33(S1), 63. 2 Plaseied A, Fatemi A. International Journal of Polymeric Materials, 2008, 57(5), 463. 3 Mcclung A, Tandon G P, Baur J W. Mechanics of Time-Dependent Materials, 2012, 16(2), 205. 4 Asprone D, Cadoni E, Prota A, et al. Journal of Composites for Construction, 2009, 13(6), 558. 5 Hossain D, Tschopp M A, Ward D K, et al. Polymer, 2010, 51(25), 6071. 6 Li C. Molecular dynamics study of crystalline linear polymer during tensile deformation. Master's Thesis, Tianjin University, China, 2016(in Chinese). 李成. 结晶线性聚合物形变过程的分子动力学研究. 硕士学位论文, 天津大学, 2016. 7 Duan F L, Jin Y K, Yan S C. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(2), 369(in Chinese). 段芳莉, 金义矿, 颜世铛. 力学学报, 2016, 48(2), 369. 8 Xu Y, Tong B, Hu X H, et al. Anhui Chemical Industry, 2020, 46(3), 15(in Chinese). 徐艳, 童彬, 胡先海, 等. 安徽化工, 2020, 46(3), 15. 9 Feng X Z, Xu S X, Yan Y W,et al. Special Purpose Rubber Products, 2020, 41(4), 6(in Chinese). 冯兴卓, 许双喜, 颜渊巍, 等. 特种橡胶制品, 2020, 41(4), 6. 10 Zhao X B, Du L, Zhang X P, et al. Polymer Materials Science & Engineering, 2002(2), 16(in Chinese). 赵孝彬, 杜磊, 张小平, 等. 高分子材料科学与工程, 2002(2), 16. 11 Jia W M, Feng Z G. Sci-Tech Information Development & Economy, 2005 (16), 128(in Chinese). 贾卫民, 冯振纲. 科技情报开发与经济, 2005 (16), 128. 12 Zhang J, Jia F, Ying X, et, al. Acta Materiae Compositae Sinica, 2020, 37(1), 50(in Chinese). 张晶, 贾非, 应枭, 等. 复合材料学报, 2020, 37(1), 50. 13 Zhang X X. Molecular dynamics simulation of amorphous linear polymer during deformation. Master's Thesis, Tianjin University, China, 2014(in Chinese). 张晓星. 非晶线性聚合物形变过程分子动力学仿真. 硕士学位论文, 天津大学, 2014. 14 Chen L L, Wang Y C, Wang D R, et al. Journal of Experimental Mechanics, 2003(4), 549(in Chinese). 陈岭丽, 王银春, 王道荣, 等. 实验力学, 2003(4), 549.
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2022, Vol. 36 
