Size effects in short fibre reinforced composites

作者：Scheider I; Chen Y; Hinz A; Huber N; Mosler J^*

来源：Engineering Fracture Mechanics, 2013, 100: 17-27.

DOI：10.1016/j.engfracmech.2012.05.005

• Composites
• Size effect
• Short fibre
• Cohesive zone model
• Debonding

The present paper is concerned with the analysis of size effects in short fibre reinforced composites. The microstructure of such composites often represents the first hierarchy level of a bioinspired material. For modelling fibre cracking as well as debonding between fibre and matrix material, a fully three-dimensional cohesive zone model is applied. It is shown that this model indeed captures the size effect associated with material failure of a single fibre. Furthermore, this scaling effect strongly depends on the shape and orientation of the assumed pre-existing crack. For this reason, a two-dimensional description can usually only predict the size effect qualitatively. Based on the aforementioned findings, a representative volume element (RVE) containing ceramic fibres embedded within a polymer matrix is considered. Similar to the single fibre, the RVE also shows a pronounced size effect. However, the underlying physical process is significantly more complex. More explicitly, the size effect of the RVE is a superposition of that related to the isolated fibres as well as of that induced by debonding of the fibres from the matrix material. For estimating the different effects, a perfect bond is also modelled.

• 出版日期2013-3
• 单位TU Dortmund