Pull-out tests with fibre-metal systems
作者:
M.V. Ravichandran,
M.R. Piggoti,
T.W. Coyle,
S.J. Thorpe,
期刊:
Composite Interfaces
(Taylor Available online 1995)
卷期:
Volume 3,
issue 5-6
页码: 343-369
年代: 1995
DOI:10.1163/156855496X00029
出版商: Taylor & Francis Group
关键词: pull-out tests;reactive and non-reactive fibre-reinforced metal systems
数据来源: Taylor
摘要:
Fibre pull-out experiments have been carried out to compare the behaviour of reactive and non-reactive fibre-reinforced metal systems. The test samples were made by melting the metal matrix in vacuum and lowering the fibre a known depth into the liquid. In all cases some brittleness appeared to develop, since final interface failure, except with steel-99% AI, was sudden, and the values of the debonding force were quite scattered in all cases. Otherwise the results agreed with earlier observations, i.e. a linear increase in debonding force with increasing embedded length until the force was high enough to break the fibre rather than debond it. Some yielding was noticeable before failure. An elasticity analysis suggested that high shear stresses were needed in some cases to initiate yielding. However, the interface strengths, as indicated by the debonding forces, were no more than about twice the shear yield stresses of the matrices, as indicated by compressive tests on the metals. A reaction layer was observed on steel which was embedded in the aluminum, but this did not appear to reduce the interface strength. With W-Cu, on the other hand, a thin layer of copper was present on the pulled out tungsten fibre, while with SiC-AI, the silicon carbide had some carbon present on the surface, with traces of AI.
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