光纤应变传感检测的非线性有限元分析和试验

Nonlinear Finite Element Analysis and Tests of Fiber-optic Strain Sensing

对埋入混凝土的Bragg光栅或Brillouin散射的光纤应变传感器,研究了光纤与基材间的细观力学和界面状态这一影响传感精度的首要问题。提出了采用非线性有限元分析此类界面的力学状态,并进行了界面切向刚度试验,得出了非线性分析的参数;给出了光纤 混凝土复合体中的应力分布,为混凝土的光纤应变传感检测提供了参考。

For Bragg grating or Brillouin scattering strain sensors embedded in concrete, it has been shown that the micro-mechanics and behaviors of the interfaces between concrete and embedded fiber-optic are the key problem affecting measuring accuracy. Nonlinear finite element method is for the first time performed for the mechanics analysis of such interfaces, tests of stiffness of the interlaces are carried out, and parameters of nonlinear analysis are obtained. The stress distribution in fiber-optic-concrete complex is presented, which may serve as reference for concrete strain detecting using fiber-optic strain sensing.