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首页> 外文期刊>Acta biomaterialia >Separating the influence of the cortex and foam on the mechanical properties of porcupine quills
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Separating the influence of the cortex and foam on the mechanical properties of porcupine quills

机译：分离皮质和泡沫对豪猪羽毛笔力学性能的影响

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摘要

Lightweight thin cylinders filled with a foam have applications as collapsible energy absorbers for crashworthy and flotation applications. The local buckling compressive strength and Young's modulus are dependent on material and geometrical properties. Porcupine quills have a thin cortex filled with closed-cell foam, and are entirely composed of α-keratin. The cortex carries the majority of the compressive load, but the foam is able to accommodate and release some of the deformation of the cortex during buckling. The presence of the foam increases the critical buckling strength, buckling strain and elastic strain energy absorption over that of the cortex. Good agreement is found between experimental results and modeled predictions. A strain distribution map of the foam close to the buckled cortex demonstrates that the deformation of the cells plays an important role in accommodating local buckling of the cortex. The robust connection between the foam and cortex results in superior crushing properties compared to synthetic sandwich structure where the foam normally separates from the shell. The foam/cortex construction of the quill can guide future biomimetic fabrications of light weight buckle-resistant columns.
机译：填充泡沫的轻质薄圆柱体可作为可塌陷的能量吸收器，用于防撞和浮选应用。局部屈曲抗压强度和杨氏模量取决于材料和几何特性。豪猪的被子有一个薄的皮质，里面充满了闭孔泡沫，完全由α-角蛋白组成。皮质承担了大部分的压缩载荷，但是泡沫能够在屈曲过程中容纳并释放皮质的一些变形。泡沫的存在增加了皮质的临界屈曲强度，屈曲应变和弹性应变能吸收。实验结果与模型预测之间找到了很好的一致性。靠近弯曲皮质的泡沫的应变分布图表明，细胞的变形在适应皮质局部屈曲中起重要作用。与泡沫通常与外壳分离的合成夹层结构相比，泡沫与皮质之间的牢固连接可实现出色的破碎性能。套筒的泡沫/皮质构造可以指导轻型抗弯柱的未来仿生制造。

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