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Fatigue and Fracture Reliability of Shell‐Mimetic PE/TiO 2 Nanolayered Composites
Author(s) -
Yang Y. J.,
Zhang B.,
Tan H. F.,
Luo X. M.,
Zhang G. P.
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700246
Subject(s) - materials science , composite material , bending , cracking , nanocrystalline material , strain energy , fracture mechanics , fracture (geology) , nanotechnology , structural engineering , finite element method , engineering
Shell‐mimetic (PE/TiO 2 ) 4 nanolayered composites stacked alternatively by 20 nm‐thick PE layers and 55 nm‐thick nanocrystalline TiO 2 layers are synthesized by a combination of the layer‐by‐layer self‐assembly and the chemical bath deposition methods. The critical cracking strain and the apparent fracture energy of the bio‐mimetic nanolayered composites are determined as 0.56% and 0.98 J m −2 , respectively, by the simply supported beam bending testing. Fatigue properties of the (PE/TiO 2 ) 4 nanolayered composites are evaluated by the dynamic bending testing method. The critical fatigue strain amplitude corresponding to the lowest strain amplitude for fatigue cracking of the present (PE/TiO 2 ) 4 NLCs is 0.0853%, which is much lower than the critical cracking strain (0.56%) under monotonic bending. The finding indicates that the potential fatigue threat to the long‐term reliability of the bio‐mimetic nanolayered composites needs to be concerned.