Fiber optical strain sensors are used to measure the strain at a particular sensor position inside the fiber. In order to deduce the strain in the surrounding matrix material, one can employ the strain transfer principle. Its application is based on the assumption that the presence of the fiber does not impede the deformation of the matrix material in fiber direction. In fact, the strain transfer principle implies that the strain in fiber direction inside the fiber carries over verbatim to the strain inside the matrix material. For a comparatively soft matrix material, however, this underlying assumption may not be valid. To overcome this drawback, we propose to superimpose the matrix material with a one-dimensional model of the fiber, which takes into account its elastic properties. The finite element solution of this model yields a more accurate prediction of the strain inside the fiber in fiber direction at low computational costs.

光纤应变传感器用于测量光纤内部特定传感器位置的应变。为了推断周围基质材料中的应变，可以采用应变传递原理。它的应用是基于这样的假设，即纤维的存在不会阻碍基体材料在纤维方向上的变形。实际上，应变传递原理意味着纤维内部沿纤维方向的应变逐字传递至基质材料内部的应变。但是，对于相对较软的基体材料，此基本假设可能无效。为克服此缺点，我们建议将基体材料与纤维的一维模型叠加，该模型考虑到其弹性特性。