Modelling the effect of size on compressive strength of fibre composites with random waviness
Modelling the effect of size on compressive strength of fibre composites with random waviness
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DOI：
10.1016/j.compscitech.2013.09.002
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发表时间：
2013-11
影响因子：
9.1
通讯作者：
M. Sutcliffe
中科院分区：
文献类型：
--
作者：
M. Sutcliffe
建立了含随机分布波纹缺陷纤维复合材料抗压强度的有限元分析模型。波度的特征在于波度振幅的标准偏差和典型的缺陷尺寸。探讨了波纹度幅值和试样尺寸对缺陷尺寸的影响。有一个显着的减少，强度与波度振幅增加，确认理想化波度分布的预测。随着试样尺寸相对于缺陷尺寸的增加，预测强度会适度降低。这种依赖性对波纹度分布的细节很敏感，可以使用威布尔模型进行解释。临界波纹缺陷的细节进行检查，以了解什么类型的缺陷控制随机波纹分布的强度。实际影响的研究结果进行了讨论，特别强调的重要性，在大型结构的纤维波纹的特性和建模。
A finite element analysis is developed to model the compressive strength of fibre composites containing randomly distributed waviness defects. The waviness is characterised by the standard deviation in the waviness amplitude and a typical defect size. The effects of the waviness amplitude and the specimen size, relative to the defect size are explored. There is a significant reduction in strength with increasing waviness amplitude, confirming predictions for idealised waviness distributions. A modest reduction in strength is predicted with increasing specimen size relative to the defect size. This dependence is sensitive to the details of the waviness distribution and can be interpreted using a Weibull model. The details of critical waviness defects are examined to understand what type of defect controls the strength with random waviness distributions. Practical implications of the findings are discussed, particularly emphasising the importance of characterising and modelling fibre waviness in large structures.