In-situ evaluation of composite structural performance in presence of high stress/strain gradients using multi-axis fiber grating strain sensors

Multi-axis fiber grating strain sensors have been used to quantitatively measure axial strain and temperature, transverse strain and transverse strain gradients in composite weave structures. This paper overviews the multi-axis fiber optic grating strain sensors and how they can be applied to measuring multidimensional strain fields interior to complex composite parts.