Effects of interphase on fiber fracture in a single fiber composite specimen
Conference
·
OSTI ID:175268
- Georgia Institute of Technology, Atlanta, GA (United States)
A single fiber composite (SFC) specimen containing a silicon carbide fiber in an aluminum matrix is used to investigate the effect of an interphase layer between the fiber and the matrix. The interphase layer consists of a reaction zone between the fiber and the matrix that occurs during fabrication. The interphase layer, when damaged during fiber fracture, introduces imperfect interfacial bonding between the fiber and the matrix. The effect of imperfect interfacial bonding is qualified in this study by evaluating the tensile stiffness degradation and the nonlinear effective stress-strain relationship caused by successive fiber fracture for an SFC subjected to axial tension. The finite element method (FEM) is used to obtain numerical solutions for the stress and strain fields in the SFC specimens for various fiber fragmentation lengths under a prescribed axial displacement loading. The fiber fractures are assumed to be uniformly distributed such that the fragment lengths are equal at each given load level. The Weibull strength distribution is used to relate the fiber fragment length to the tensile strength of the brittle fiber. The FEM stress and strain results are used to calculate the effective modulus of the SFC, which characterizes the degradation in tensile stiffness caused by successive fiber fracture. The effective stress is determined for a given fracture density using the effective applied strain and the corresponding effective modulus. The final result is the relationship between the effective stress and effective strain. Qualitative comparisons of the stiffness degradation and the effective stress-strain relationship are made between models with perfect and imperfect interfacial bonding to evaluate the effect of a interphase layer.
- OSTI ID:
- 175268
- Report Number(s):
- CONF-950686--
- Country of Publication:
- United States
- Language:
- English
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