The mechanism in bio-materials by multi-scale strain measurement

采用原位场发射扫描显微镜（FE-SEM）研究了在纳米到毫米多尺度范围内的变形和应变分布的测量方法。研制了一种特殊的加载装置，并将其安装在FE-SEM腔室中。基于电子光刻技术，建立了一种由网格、随机和纳米簇图组成的多尺度图，用于测量不同尺度下界面周围的局部变形。将多尺度测量方法应用于复合碳纤维增强材料和珠胶海壳等分层微结构材料，评价其在加载过程中的力学特性。显然，本研究可以用来提供在不同长度尺度下发展梯度连续塑性所需的多长度尺度下的变形行为及其相关边界条件，以了解分层结构材料。

The measurement method on deformation and strain distribution in a multi-scale range from nanometers to millimeters was investigated by in situ Field Emission Scanning Microscope(FE-SEM) observations. A special loading device was developed and installed into FE-SEM chamber. A multi-scale pattern composed of a grid as well as random and nano-cluster pattern was developed based on electron lithography technique to measure the localized deformation around the interfaces at different scales. The multi-scale measurement method was applied to hierarchical microstructure materials such as hybrid CFRP and Nacre form sea shell to evaluate the mechanical characterization during loading. It is clear that the present study can be used to provide the deformation behaviors at multiple length scales and its related boundary conditions needed for developing a gradient continuum plasticity at different length scales for understanding hierarchical structure materials.