Influence of process parameters on residual stress in thermoplastic filament-wound parts

Abstract

Owing to the existence of residual stresses, working stresses can have a smaller effect. The present paper reports on an investigation of the influence of process parameters on the induced residual stress in filament-wound test samples. It describes the necessary machinery and measuring devices for a repeatable process. The process parameters were identified and their influence on the implemented residual stress during the production of thermoplastic filament-wound parts was determined using a design of experiments approach with a fractional factorial concept. As a result of this sensitivity study on the established process, the winding angle, the annealing, the number of layers, the mandrel temperature and, to a slightly smaller extent, the tape tension were identified to have a significant influence. However, only the applied tape tension provides the possibility of controlling the residual stress independently from the parameters that are fixed by the mechanical design or simply the geometry of the part.