贝壳珍珠层不同取向弹性模量的研究

研究天然生物材料的组织结构特征与其性能之间的关系对于材料的仿生有重要意义．在自制的激光测试设备上用三点弯曲法对贝壳珍珠层不同取向的弹性模量进行了研究，报道了不同取向和加载方式条件下弹性模量的变化规律。结果表明，在平行和倾斜于生长纹路方向上弹性模量的平均值分别为60．3GPa和56．7GPa，而垂直于纹路方向的为48GPa，呈现出各向异性。弹性模量的各向异性主要来自于珍珠层微观组织结构和贝壳生长纹结构的特点．

MEASUREMENT OF ELASTIC MODULUS OF NACRE BY THREE-POINT BEND TEST

Elastic modulus test of nacre is significant to understanding the behavior of nacre and the biomimetic designing of materials. Elastic modulus of nacre in different orientation with respect to its growing trace direction was determined by using three-point bending tests, which is self-designed and equipped with laser displacement detector. The moduli of nacres in parallel and oblique directions with respect to the growing trace are 60.3 GPa and 56.7 GPa, while in perpendicular direction the elastic modulus is 48 GPa. The laminated microstructure of nacre and unique growing trace on the shell of mollusk contribute to the anisotropic modulus of elasticity.