Author(s): Li Zhijun; Qu Yuexia; Wang Yongxue; Li Guangwei; Shen Zhaowei
Linked Author(s): Zhijun Li
Keywords: Polypropylene; Synthetic model ice; Flexural strength; Experimentalstudy
Abstract: Based on the statistical values of Bohai ice physical and mechanical parameters, such as density, compressive strength, flexural strength, shear strength, elastic modulus and friction coefficient, an ideal synthetic model ice was designed following the scale of 1:10-1:30. An almost ideal model ice was found and called DUT-1 Ice. In order to know DUT-1 Ice flexural strength in detail, over 500 samples for a series of system tests were done. It is found that ductile bending happens under less than 350～400kPa/s in 3-Point bending and 60～65 kPa/s in cantilever bending. Their corresponding failure time are in the range of 0.03～0.38s and 0.5～0.76s respectively. The failure time is in the range of simulated natural ice flexural failure time. The comparison of flexural strength of downward and upward loading cantilever tests gives the certification of isotropy of the model ice because of its granular structure. After one hour wetting, the flexural strength of 3-Point tested samples becomes steady and keeps the state over 4 hours. This period is long enough for performing model tests of ice behaviors or ice interactions with structures. Similar with natural ice, DUT-1Ice flexural strength is increasing with increased wetted density. The flexural strengths from 3-Point bending and cantilever bending show almost the same value range. In the normal distribution of their strengths, the scatter of data from 3-Point bending is little larger. The middle value of the flexural strength is 45 kPa and the range is 35～65 kPa. These values are suitable with the requirement of 1:10～1:30 scale based on Bohai natural ice flexural strength of 450～750kPa.
Year: 2001