Abstract:Considering that the rubber isolation bearing of buildings is exposed to the air will be respectively subjected to the freeze-thaw cycles and thermal aging in the wintertime period and the summertime period, the isolation effect of the bearing is very likely to be affected. To this end, the freeze-thaw cycle, thermal aging and alternation effects tests of natural rubber materials were carried out, and the mechanical properties of natural rubber materials with time and the depth of deterioration were studied. The results show that: thermal aging is the main factor affecting the hardness and the stress at definite strain of rubber materials; the trend of tensile strength and the elongation at break with time under freeze-thaw cycles and the thermal aging decreases, and the influence of the alternating effects are not a simple superposition. The influence of hardness in the depth direction of the rubber block was little, while the stress at definite strain is greater on the surface area of the rubber block under freeze-thaw cycles. The influence of the hardness and the stress at definite strain of the rubber block in the depth direction is greater on the 20mm of the surface area under thermal aging and the alternation effects. The influence of the tensile strength and elongation at break of the rubber block in the depth direction is most obvious on the 20mm of the surface. The above research results can provide a basis for the study of the degradation law of the rubber isolation bearing and the evaluation of the life cycle performance of the isolation projects.
Keywords: freeze-thaw cycle; thermal aging; alternation effect; rubber isolation bearing; rubber material; mechanical properties
洪迪甫1,2,马玉宏1,2,赵桂峰3. 冻融循环与热老化交替作用下天然橡胶力学性能试验[J]. 振动与冲击, 2022, 41(14): 84-91.
HONG Difu1,2,MA Yuhong1,2,ZHAO Guifeng3. Experimental study on the performance of natural rubber under alternation effects of freeze-thaw cycles and thermal aging. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(14): 84-91.
[1] Alan, N Gent, Engineering with rubber how to design component 2nd Edition[M]. Hanser Verlag, 2001.
[2] 汪月琼,林宏图,王兵兵,等. 不同品系天然橡胶的低温诱导结晶性能[A]//北京理工大学.2017第一届天然材料研究与应用研讨会论文集[C].北京:天然材料研究与应用研讨会组委会,2017:4.
Wang Yueqiong, LIN Hongtu, WANG Bingbing, et al. Crystallization properties of natural rubber from different hevea clones[A]//Beijing Institute of Technology. Proceedings of the 2017 1st Conference on Research and Application of Natural Materials [C].Beijing: Organizing Committee of Conference on Research and Application of Natural Materials,2017:4.
[3] Wood L A , Bekkedahl N . Crystallization of unvulcanized rubber at different temperatures[J]. Journal of Applied Physics, 1946, 17(5):362-375.
[4] Russell, E. W . The crystallization of vulcanized natural rubber at low temperatures[J]. Transactions of the Faraday Society, 1951, 47:539.
[5] Fuller K N G, Gough J, Thomas A G . The effect of low-temperature crystallization on the mechanical behavior of rubber[J]. Journal of Polymer Science, Part B (Polymer Physics), 2004, 42(11):2181-2190.
[6] 王惠中.低温对橡胶性能的影响[J].世界橡胶工业,2016,43(06):49-51.
WANG Huizhong.The properties of rubber under low temperature[J]. World Rubber Industry,2016,43(06):49-51.
[7] WOO C S,CHOI B I,PARK H S,et al.Reliability evaluation of rubber mount for elevator cabin[J].KGK-Kautschuk Gummi Kunststoffe,2009, 62(7/8) : 392—395.
[8] Gu H S , Itoh Y . Ageing behaviour of natural rubber and high damping rubber materials used in bridge rubber bearings[J]. Advances in Structural Engineering, 2010, 13(6):1105-1113.
[9] 谢婵,贾志欣,罗远芳,等.2-巯基苯并咪唑钐配合物在天然橡胶中防老化作用的研究[J].高分子学报,2011(3):320-326.
XIE Chan, JIA Zhixin, LUO Yuanfang, et al. Antioxidant effect of SM(Ⅲ) complex with 2-mercaptobenzimidazole in natural rubber vulcanizates[J]. Acta Polymerica Sinica,2011(3):320-326.
[10] 晁海洋,马文博,李斐婕,等.丁腈橡胶5080老化性能研究及寿命预测[J].特种橡胶制品,2018,39(06):47-53.
CHAO Haiyang,MA Wenbo,LI Feijie, et al.Research on the aging performance and life prediction of NBR[J]. Special Purpose Rubber Products, 2018,39(06):47-53.
[11] 阙刚,彭旭东,沈明学,等.丁腈橡胶热空气老化力学性能分析及贮存寿命预测[J].润滑与密封,2018,43(02):18-25.
QUE Gang, PENG Xudong, SHEN Mingxue, et al. Mechanical properties analysis and storage life prediction of hot air aging of NBR[J] Lubrication Engineering,2018,43(02):18-25.
[12] ITOH Y, YAZAWA A, KITAGAWA T ,et al. Study on environmental durability of rubber bearing for bridges[J]. International Association for Bridge and Structural Engineering,2002,86(11):137-143.
[13] 于浩. 侵蚀条件下橡胶材料受力性能试验研究[D].沈阳建筑大学,2016.
YU Hao. Test research on the mechanical performance of rubber material under the erosion condition [D]. Shenyang:Shenyang Jianzhu University,2016.
[14] 余超,文庆珍,余宏伟,等.丁苯橡胶在热空气和海水中老化性能的比较[J].合成橡胶工业,2010,33(01):56-59.
YU Chao, WEN Qingzhen, YU Hongwei, et al.Comparison of properties of styrene-butadiene rubber aged in seawater and in hot air[J]. China Synthetic Rubber Industry,2010,33(01):56-59.
[15] 刘荣,马玉宏,赵桂峰,等.老化-海蚀循环作用下高阻尼橡胶隔震支座橡胶材料性能劣化规律[J].材料导报,2020,34(04):4166-4173.
LIU Rong, MA Yuhong, ZHAO Guifeng, et al.Trend of property deterioration for rubber material used in high damping rubber isolation bearing under aging-marine erosion cycle [J]. Materials Reports, 2020,34(04):4166-4173.
[16] 李艳敏,马玉宏,赵桂峰,等.海水干湿循环作用下天然橡胶支座橡胶材料性能劣化试验[J].振动与冲击,2019,38(14):146-152+222.
LI Yanmin, MA Yuhong, ZHAO Guifeng, et al. Experimental study on the property deterioration of rubber material used as natural rubber bearing under seawater wet-dry cycles [J]. Journal of Vibration and Shock, 2019,38(14):146-152+222.
[17] 马玉宏,赵桂峰,罗佳润,崔杰,周福霖.老化及海蚀作用下近海桥梁隔震支座橡胶材料性能劣化试验[J].振动与冲击,2016,35(16):114-122+129.
MA Yuhong, ZHAO Guifeng, LUO Jiarun, et al.Experimental research on property deterioration of rubber material used as natural rubber isolator for offshore bridges under aging and marine corrosion[J]. Journal of Vibration and Shock,2016,35(16):114-122+129.
[18] 张延年,单春红,郑怡,等.冻融条件下公路桥梁板式氯丁橡胶支座抗剪试验[J].工程力学,2013,30(11):148-152.
ZHANG Yannian, SHAN Chunhong, ZHEN Yi, et al.Shear tests of plain chloroprene rubber bearings of highway bridge under freeze-thaw cycle condition[J]. Engineering Mechanics, 2013,30(11):148-152.
[19] 姚兰英,彭蜀晋.化学动力学的发展与百年诺贝尔化学奖[J].大学化学,2005(01):59-64.
YAO Lanying,PENG Shujin.The development of chemical kinetics and the Nobel Prize in Chemistry[J]. University Chemistry,2005(01):59-64.
[20] 孙举涛,王威,张萍,等. 硬度和回弹性的协同效应对丁苯橡胶磨耗性能的影响规律研究[J]. 橡胶工业,2012,59(6):339-342.
SUN Jutao, WANG Wei, ZHANG Ping, et al.Effect of hardness and resilience on wear resistance of SBR[J] .China Rubber Industry,2012, 59(6):339-342.
[21] FREAKLEY P K , PAYNE A R.橡胶在工程中应用的理论与实践[M].杜承泽,译.北京:化学工业出版社,1985.
[22] 刘文光, 李峥嵘, 周福霖,等. 低硬度橡胶隔震支座基本力学性能及恢复力特性[J].地震工程与工程振动, 2002, 022(003):138-144.
LIU Wenguang, LI Zhengrong, ZHOU Fulin, et al.Force-displacement relation and fundamental properties of low stiffness rubber bearings[J].Earthquake Engineering and Engineering Dynamics, 2002, 022(003):138-144.