Simulation of Mechanical Properties of Bio‐Inspired TiO2/PE Nanocomposites
Simulation of Mechanical Properties of Bio‐Inspired TiO2/PE Nanocomposites
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BioâInspired TiO2/PE 纳米复合材料机械性能的模拟
DOI：
10.1002/adem.201200386
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发表时间：
2013
影响因子：
3.6
通讯作者：
Ulrich Weber
中科院分区：
文献类型：
--
作者：
Galina Lasko;Žaklina Burghard;Joachim Bill;Immanuel Schäfer;Siegfried Schmauder;Ulrich Weber
The extraordinary combination of strength and toughness attained by nature’s highly sophisticated structural design in nacre has inspired the synthesis of novel layered nanomaterials. In the present work, numerical and analytical models are applied on the nanometer scale to attain a better insight and understanding concerning the mechanical behavior of bio-inspired layered materials. The material is composed of the oxide TiO2 and organic polyelectrolyte (PE) layers. The efforts focus on applying continuum mechanics in nanoscale numerical models to the layered TiO2/PE system, obtained by a chemical bath deposition (CBD) procedure at low temperatures. Based on previous experimental investigations, Finite-Element (FE) simulations of the mechanical behavior of the layered ceramic and organic phases (TiO2-PE) are performed. The elastic-plastic properties of titania and organic polyelectrolyte phases are determined via FE-modeling of the nanoindentation process. Based on experimental observations, the influence of mineral bridges has been taken into account in calculations of Young’s modulus of the layered nanocomposite as a function of the thickness ratio of the constituents. The mineral bridges have been considered to possess a high Young’s modulus (achieving the Young’s modulus of bulk rutile TiO2 ¼ 282GPa). Taking the experimental dependence of the Young’s modulus on the thickness ratio of the constituents into account, a method is elaborated to define the volume fractions of the mineral bridges. Numerical and analytical models with the as above defined volume fractions of mineral bridges generate results which match the ones of the experiment. By application of this approach, the mechanical properties of artificially produced materials, mimicking nacre structure, can be predicted.Over many million years, nature developed optimized and highly specialized materials with outstanding features. Biomaterials reveal remarkable combinations of mechanical properties such as stiffness, hardness, and fracture toughness which are hardly attained by artificial materials.[1] Mollusk shells are an excellent example of such high performance natural materials, they consist mainly of CaCO3 in its aragonite form. The impressive feature of shells is their high work of fracture: in a work of Jackson et al.[2] the authors state that the work of fracture is 3000 times higher than that of monolithic CaCO3. The underlying principles and features of nacre are summarized in the work of Gao [3] where the correlations between size, hierarchy, material properties and fracture behavior are described. Other strong biomaterials like bones and teeth show a comparable concept in their construction: A nanometer sized hard mineral crystal is arranged in a parallel staggered pattern in a soft matrix which consists of proteins–it is known to be a general principle in nature to reinforce materials.[4, 5] The special properties of biomaterials inspired the development of a large class of biomimetic materials and organic/inorganic composites [6–8] and especially the properties of nacre are of interest for scientific researchers. It was found that aragonite layers consist of hexagonal platelets which are interconnected by the so called mineral bridges. Both structures are important for the reinforcement of nacre.[6, 9] In this paper, the mineral bridges and their role for the mechanical properties of the bio-inspired nanocomposite will be of main interest. Mineral bridges are described as a number of small mineral structures with a diameter about 30nm, randomly distributed in the protein layer that pervade through the organic layer and interconnect the hexagonal platelets.[10] Their …
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金属陶瓷多层压痕有效弹性模量分析
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
G. Tang;Y. Shen;D. Singh;N. Chawla
通讯作者：
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影响因子：
2.5
作者：
Huajian Gao
通讯作者：
Huajian Gao
影响因子：
2.5
作者：
Watson, S;Beydoun, D;Amal, R
通讯作者：
Amal, R
影响因子：
3.4
作者：
Gaillard, Yves;Rico, Victor J.;Gonzalez-Elipe, Agustin R.
通讯作者：
Gonzalez-Elipe, Agustin R.
使用纳米压痕测试测定双相不锈钢上沉积的 TiO2 薄膜的弹塑性
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
Jacques Breuils;H. Pelletier;J. Krier;V. Vignal
通讯作者：
V. Vignal