Research on Tensile stress relaxation characteristics of Pinus sylvestris

【Author】

Li Xue-qi,Wang Xi-ming(Inner Mongolia Agricultural University College of Material Science and Art Design Hohhot 010018)

【Abstract】

This research aims to provide theoretical proof for the further study on the factors of stress relaxation under different conditions.In this study,Pinus sylvestris was used as the experimental materials and dynamic stress-strain test system was used as experimental instrument.Stress relaxation was not only affected by the temperature,but also affected by the moisture.The results showed that the temperature and moisture content on the stress relaxation have a significant impact.Stress relaxation dramatically increased and the residual stress rapidly decreased with temperature enhancing or moisture content rising.In other words,the initial stress decreased gradually and the relaxation rate was on the rise.It was also found that,under the same conditions,compared with the tangential section of the Pinus sylvestris,the radial section has the larger initial stress and smaller stress relaxation rate.Besides,the initial stress of late wood is larger than early wood and the stress relaxation rate of late wood is smaller than early wood.

【Keywords】

Pinus sylvestris,tensile stress relaxation

References

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Springer Journals Database

Total: 11 articles

  • [1] Wang Jieying; Zhao Guangjie. School of Technology, Beijing For. Univ.,100083, P.R.China., Creep of compressed wood of Chinese fir heat treated in air., Journal of Beijing Forestry University,
  • [2] CHENG Wan-li~1;LIU Yi-xing~1;Toshiro Morooka~2.1 Key Laboratory of Bio-based Material Science and Technology,Ministry of Education,Material Science and Engineering College,Northeast Forestry University,Harbin,150040,P.R.China;2 Research Institute for Sustainable Humanoshere,Kyoto University,611-0011,Japan., Tensile stress relaxation of wood under high temperature and pressurized steam., Journal of Beijing Forestry University,
  • [3] A. C. Backman;;K. A. H. Lindberg, Differences in wood material responses for radial and tangential direction as measured by dynamic mechanical thermal analysis, Journal of Materials Science,
  • [4] Jiang Jiali, Dynamic Viscoelastic properties for Wood Treated by Different Drying Methods,

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