中文摘要：

应用高阶Cauchy-Born准则,通过建立新旧坐标系下平面矢量的坐标转换公式,推导新坐标系下应变梯度的关系式,为应变梯度传感器的应用提供了理论基础,为结构监测提供了新方法。

英文摘要：

In this paper,by using the high-order Cauchy-Born rule and the coordinate transformation formula of plane vector in the new and old coordinate systems,the expression of strain gradient in the new coordinate system is derived,which provides a theoretical basis for the application of strain gradient sensors.