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Hygro-thermal ageing of composite materials introduces a modification in the  material properties of its constituents and the development of stresses that can  lead to severe local damage like fracture of the reinforcing fibers and  de-bonding of the latter from the matrix. The study of the complex stress field  generated by this induced damage is helpful in designing more resistant  materials. Modelling strain-stress filed in the vicinity of these  discontinuities has led to the development of different analytical models like  for instance shear lag models based on simplification assumptions. Recently the  development of embedded optical sensors allowed to shed light on the assumptions  made, since they can be used, at the same time, as reinforcement and sensors and  thus being capable to give information on the strain distributions during the  evolution of the damage. In this work a single fiber composite, whose  reinforcement is an optical sensor, is used in order to investigate the complex  strain field generated by the fiber fracture caused by the matrix swelling  during water uptake

Analysis of hygrothermally induced fiber fracture in single fiber composite using fiber Bragg grating