摘要
根据复合材料的疲劳损伤机理,重新定义了疲劳损伤因子。根据这个疲劳损伤因子,提出了一种考虑纤维的含量和温度影响的单向纤维增强复合材料剩余刚度和剩余强度的模型;进而根据室温剩余刚度-剩余强度关联模型引入温度修正参数得到了一定温度下的剩余刚度-剩余强度关联模型,并进一步得到了与剩余刚度相关的剩余强度模型。于是,在建立剩余强度模型时减少了剩余强度的试验量和数据分散性的影响。最后,对现有文献中复合材料疲劳试验数据和剩余强度试验数据进行拟合,证明本文提出的剩余刚度模型和剩余强度模型精确描述了剩余刚度和剩余强度下降的规律。根据剩余刚度模型预测了不同纤维体积分数的复合材料在不同温度下剩余刚度衰减的规律。
The conventional fatigue damage factor was redefined by analyzing the relevant fatigue damage mechanisms in detail.Then,a model of residual-stiffness and-strength was individually proposed in consideration of the influence of reinforced fiber volume fraction and temperature on the properties of unidirectional fiber reinforced composites.Furthermore,by introducing temperature correction parameters into the above models of room temperature,a correlation model of residual strength with residual stiffness was further acquired,therewith the establish of residual strength model may be facilitated by reducing the dependance on the number of residual strength tests,and relieving the effect of data dispersion as well.Finally,the fatigue test data and residual strength test data of composite collected from the existing literatures were fitted and verified,it follows that the residual stiffness model and residual strength model can accurately describe the degradation behavior of residual stiffness and residual strength.The residual stiffness model can be also used to predict the degradation behavior of the residual stiffness of the composite with different fiber volume fraction at different temperature.
作者
吴一凡
温卫东
崔海涛
张宏建
WU Yifan;WENWeidong;CUI Haitao;ZHANG Hongjian(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2021年第12期893-902,共10页
Chinese Journal of Materials Research
基金
国家科技重大专项(2017-IV-0007-0044)。
关键词
复合材料
损伤因子
剩余刚度
剩余强度
温度
纤维体积含量
composite
damage factor
residual stiffness
residual strength
temperature
fiber volume fraction
作者简介
吴一凡,男,1996年生,硕士生;通讯作者:温卫东,gswwd@nuaa.edu.cn,研究方向为先进复合材料结构强度与疲劳。
