Material Engineering and Mechanical Manufacturing

Mechanical properties of K-cor sandwich composite under hygrothermal environment

  • SHEN Yufeng ,
  • LI Yong ,
  • WANG Xin ,
  • HUAN Dajun
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  • College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received date: 2015-08-06

  Revised date: 2015-09-14

  Online published: 2015-09-21

Supported by

National Basic Research Program of China (2014CB046501); Aeronautical Science Foundation of China (2015ZE52049)

Abstract

K-cor sandwich is a new kind of foam sandwich reinforced by Z-pin techniques. The absorption curves of different samples by changing the implanted density of Z-pin are investigated, and the effect of the hydrothermal condition on the three point bending and compressive properties of the samples with changing parameters of Z-pin are also determined. The results indicate that Z-pin improves the dimensional stability of the samples by changing the implanted density in sandwich structure, but it does not affect the moisture absorption rate. The sample which increases the implanted density of Z-pin can significantly improve the three point bending strength and compressive strength under dry and wet conditions, and the samples have a higher strength retention rate. The three point bending strength of K-cor with Z-pin density of 12 mm×12 mm in wet condition is improved by 11.1%, and the compressive strength of K-cor with Z-pin density of 8 mm×8 mm in wet condition is improved by 17.5% compared with blank sandwich structure in dry condition. It shows that K-cor sandwich structure has excellent wet and heat resistance. The samples which reduce implantation angle of Z-pin can significantly increase the compressive strength under dry and wet conditions. The compressive strength of K-cor sample with Z-pin of 0° in wet condition is the same as Z-pin of 40° in dry condition. But this factor has less influence on three point bending strength.

Cite this article

SHEN Yufeng , LI Yong , WANG Xin , HUAN Dajun . Mechanical properties of K-cor sandwich composite under hygrothermal environment[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(7) : 2303 -2311 . DOI: 10.7527/S1000-6893.2015.0251

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