Hindered crack propagation in materials with periodically varying Young's modulus - Lessons from biological materials
Hindered crack propagation in materials with periodically varying Young's modulus - Lessons from biological materials
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DOI：
10.1002/adma.200602394
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发表时间：
2007-09-17
影响因子：
29.4
通讯作者：
Kolednik, Otmar
中科院分区：
文献类型：
--
作者：
Fratzl, Peter;Gupta, Himadri S.;Kolednik, Otmar
许多生物材料，例如玻璃海绵、珍珠质或骨头，都具有层状结构。众所周知，片层之间的弱界面可能会使裂纹偏转，从而提高韧性，但我们分析了杨氏模量周期性变化的影响。即使没有弱界面，最大模量与最小模量之间的比率为 5 也足以阻止刚度最小值附近的裂纹。
Many biological materials, such as glass sponges, nacre or bone have a lamellar structure. While it is well known that weak interfaces between lamellae may deflect cracks and, thus, increase the toughness, we analyze the influence of periodic variations in Young's modulus. Even without weak interfaces, a ratio of 5 between maximum and minimum modulus can be sufficient to stop a crack in the vicinity of the stiffness minimum.