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The estimation of fracture process of composite material by moisture absorption or desorption

通过吸湿或解吸估计复合材料的断裂过程

基本信息

批准号：
61550057
负责人：
JINEN Eiichi
金额：
$ 1.15万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550057/
关键词：
CFRP Moisture Desorption or Absorption Non-Ficknian type Fatigue Damage Cycle Ratio Nylon 6 ナイロン6 相互拡散係数水分子平均寿命比

项目摘要

The effect of fatigue dmage on an ablity of moisture desorption in the three different atmosphere conditions; in vacume (below 1 x 10^<-6> Torr), high (60゜C) or room temperature dry air cndition, from a short carbon fiber reinforced nylon 6 composite (CFRP) which mold injection into an ASTM-A type specimen and it moisture content have reached to a equilibrium state or on the ablity of moisture absorption process to the dry specimen by meanse of above desorption processes has been examined from the stand point of the degree of fatigue damage in order to estimate the fracture process of the material. The following results are obtained: In both absorption process and desorption one in three atmosphere conditions, a larger change rate of the relation of moisture regain and squre root of the time of the fatigued specimen is recognixed than for the virgin one. Especially, in case of tension state under a vacume condition, the change of moisture regain value increase with an increasing of cycle ratio of the specimen, such tendency shows a dependence on the degree of fatigue damage of the material. The reason for such tendency seems to be considered that the area of interface increase by debonding between matrix and fibers and initiation of micro cracks grows to macro ones or forming of cavities during the fracture process.

疲劳损伤对三种不同大气条件下水分解吸能力的影响：真空（低于1 × 10 - 4 Torr）、高温（60 ℃）或室温干燥空气条件<-6>，从短碳纤维增强尼龙6复合材料（CFRP），其模具注射到ASTM-2000标准中。本文从疲劳损伤程度的观点出发，考察了一种典型试件及其含水量达到平衡状态或通过上述脱湿过程对干燥试件进行吸湿处理的能力，以便估计材料的断裂过程。结果表明：在三种大气条件下，无论是吸湿过程还是解吸过程，疲劳试样的回潮率与时间平方根关系的变化率均大于未疲劳试样。特别是在真空拉伸状态下，试样的回潮率随循环比的增加而增加，这种趋势与材料的疲劳损伤程度有关。这种倾向的原因似乎被认为是由于基体和纤维之间的脱粘和微裂纹的萌生扩展到宏观裂纹或在断裂过程中形成空腔的界面面积增加。