Evaluation of inhomogeneous deformation and stress concentration in polymer composites injection weld by means of thermoelastic techniques

Fiber composite materials are widely used in aerospace industries due to th eir high specific strength and stiffness. Especially, the increasing use of polymer composite materials for injection of automobile components has led to a considerable interest in the application of stress pattern analysis b y thermal emission to these composite materials. Therefore, in this study t he microstructure of glass fiber orientation at the parent and weld line of polycarbonate is observed by a light transmission microscope. And we also investigate a stress concentration model of a notch including short glass f ibers. Especially the polymer injection weld reorients the fiber to suggest a new method for the evaluation of inhomogeneous deformation.