文章摘要
湿热和电热作用对复合材料力学性能的影响
Hygrothermal and Electric-Thermal Effects on Mechanical Properties of Composites
  
DOI:10.16865/j.cnki.1000-7555.2018.07.016
中文关键词: 复合材料  电热作用  脱湿率  弯曲性能  断口形貌
英文关键词: composites  electric-thermal effect  desorption  flexural performance  fracture morphology
基金项目:民航科技项目(MHRD20160106);中央高校中国民航大学专项基金(3122016A007)
作者单位
路鹏程,孙凌丰,王宏洋,李 娜 中国民航大学 理学院 天津市民用航空器适航与维修重点实验室,天津 300300 
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中文摘要:
      对民用航空器结构用碳纤维树脂基复合材料(CFRP)进行吸湿性能研究,测试其吸湿率随时间的变化规律,同时监测吸湿过程中试样电阻率的变化规律,对饱和吸湿试样再进行通电处理,获取脱湿率与通电电流的关系,之后对未处理、吸湿及吸湿/通电处理试样进行弯曲性能测试,通过观察弯曲断口处裂纹走向及断口形貌,分析湿热、湿热/电热作用对CFRP弯曲性能的影响。结果表明,试样吸湿率随吸湿时间延长呈先上升后趋于稳定的趋势,其电阻率呈先下降后稳定的变化规律,饱和吸湿试样经通电处理后,脱湿率随电流增加而增大,但试样湿含量不能降低为0。吸湿后小电流2~4A(ρ=33.4~66.8mA/mm2)处理,试样弯曲性能较单纯吸湿试样有所提升,弯曲断裂后试样并未分离成两部分,吸湿后大电流5~6A(ρ=83.6~100.2mA/mm2)处理,造成试样弯曲强度下降,弯曲断裂表现为脆性断裂。
英文摘要:
      The moisture absorption behavior of carbon fiber reinforced polymer for civil aircraft was investigated, and the resistivity of CFRP was detected simultaneously. The saturated absorbent samples were dealed with different electric current to obtain the relationship between desorption of moisture and electric current. The hygrothermal and electric-thermal effects on flexural properties were analyzed by bending test, crack orientation and flexural fracture morphology. Results indicate that the absorption rate of samples increases first and then followed by a stable trend. The resistivity variation with time is that it declines first and then shows a steady trend. The desorption rate of saturated absorbent samples grows with the increase of current, but the moisture content of the samples cannot reduce to zero. When the current of 2 A (ρ=33.4 mA/mm2)~4 A(ρ=66.8 mA/mm2)is applied to saturated absorbent specimens, the fracture performance is enhanced comparing with pure absorbent samples and the specimens do not separate into two parts, while the high current (5~6 A)makes the flexural performance decrease and it shows brittle fracture.
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