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您的检索式：作者名="Cuncai Fan"
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| 1 | Hierarchical structure observation and nanoindentation size effect characterization for a limnetic shell显示文摘In the present research, hierarchical structure observation and mechanical property characterization for a type of biomaterial are carried out. The investigated biomaterial is Hyriopsis cumingii, a typical limnetic shell, which consists of two different structural layers, a prismatic 'pillar'structure and a nacreous 'brick and mortar' structure. The prismatic layer looks like a 'pillar forest' with variationsection pillars sized on the order of several tens of microns.The nacreous material looks like a 'brick wall' with bricks sized on the order of several microns. Both pillars and bricks are composed of nanoparticles. The mechanical properties of the hierarchical biomaterial are measured by using the nanoindentation test. Hardness and modulus are measured for both the nacre layer and the prismatic layer, respectively.The nanoindentation size effects for the hierarchical structural materials are investigated experimentally. The results show that the prismatic nanostructured material has a higher stiffness and hardness than the nacre nanostructured material.In addition, the nanoindentation size effects for the hierarchical structural materials are described theoretically, by using the trans-scale mechanics theory considering both strain gradient effect and the surface/interface effect. The modeling results are consistent with experimental ones. | Jingru Song Cuncai Fan Hansong Ma Yueguang Wei | 2015 | Acta Mechanica Sinica2015，31，3： | 4 |
| 2 | Crack deflection occurs by constrained microcracking in nacre显示文摘For decades, nacre has inspired researchers because of its sophisticated hierarchical structure and remarkable mechanical properties, especially its extreme fracture toughness compared with that of its predominant constituent,CaCO_3, in the form of aragonite. Crack deflection has been extensively reported and regarded as the principal toughening mechanism for nacre. In this paper, our attention is focused on crack evolution in nacre under a quasi-static state. We use the notched three-point bending test of dehydrated nacre in situ in a scanning electron microscope(SEM) to monitor the evolution of damage mechanisms ahead of the crack tip. The observations show that the crack deflection actually occurs by constrained microcracking. On the basis of our findings, a crack propagation model is proposed, which will contribute to uncovering the underlying mechanisms of nacre's fracture toughness and its damage evolution. These investigations would be of great value to the design and synthesis of novel biomimetic materials. | Jingru Song Cuncai Fan Hansong Ma Lihong Liang Yueguang Wei | 2018 | Acta Mechanica Sinica2018，34，1： | 1 |
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