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amelia_s

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The mechanisms underlying the toughening in rigid natural composites exhibited by the concentric cylindrical composites of spicules of hexactinellid sponges, and by the nacre (brick-and-mortar) structure of mollusks such as Haliotis rufescens (red abalone), as well as the crossed-lamellar structure of Strombus gigas (queen conch) show commonalities in the manner in which toughening takes place. It is proposed that crack diversion, a new kind of crack bridging, resulting in retardation of delamination, creation of new surface areas, and other energy-dissipating mechanisms occur in both natural systems. However, these are generally different from the toughening mechanisms that are utilized for other classes of structural materials. Complementary to those mechanisms found in rigid natural ceramic/organic composites, special architectures and thin viscoelastic organic layers have been found to play controlling roles in energy dissipation in these structures.

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武汉一心一译

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amelia_s: 金币+50, 翻译EPI+1, 有帮助 2015-05-02 11:46:51
纯自然复合材料中的底层增韧机制,体现在六放海绵纲针状结构的同轴圆柱复合材料,以及软体动物诸如红鲍螺的珍珠贝(实体的)结构,另外,在女王凤凰螺的交错纹片结构也展现出了这种增韧机制。

与此对应,裂缝导流是一种新型的裂纹桥联方式,它可以迟延化学分层,生成新的表面区域,和针对以上两个自然体系的消能机制。 通常,它与其它结构材料的增韧机制不同。为了与纯自然陶瓷复合材料/有机复合材料中的增韧机制形成互补,这钟材料的特殊架构 和粘弹性有机薄层,能对结构中能量耗散系统发挥控制作用。
2楼2015-04-23 10:42:43
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