Journal
MATERIALS
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/ma11101874
Keywords
metal matrix composites; Z-pin reinforcement; delamination; carbon fiber; strengthening mechanisms
Categories
Funding
- Natural Science Foundation of China [51305075]
- Science & Technology Innovation Foundation for Harbin Talents [2017RAYXJ021]
- Natural Science Foundation of Heilongjiang Province [LC2015010]
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This paper presents the effect of through-thickness reinforcement by steel z-pins on the interlaminar shear properties and strengthening mechanisms of carbon fiber reinforced aluminum matrix composites (Cf/Al) with a short beam shear test method. Microstructural analysis reveals that z-pins cause minor microstructural damage including to fiber waviness and aluminum-rich regions, and interface reaction causes a strong interface between the stainless steel pin and the aluminum matrix. Z-pinned Cf/Al composites show reduced apparent interlaminar shear strength due to a change in the failure mode compared to unpinned specimens. The changed failure mode could result from decreased flexural strength due to microstructural damage as well as increased actual interlaminar shear strength. Fracture work is improved significantly with a z-pin diameter. The strong interface allows the deformation resistance of the steel pin to contribute to the crack bridging forces, which greatly enhances the interlaminar shear properties.
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