( SE18--1186) EXPERIMENTAL CALIBRATION OF A NUMERICAL MODEL OF PREPREG TACK FOR PREDICTING AFP PROCESS RELATED DEFECTS

摘要

Wrinkles, puckers, and fiber bridging are among the major defects encountered in the AutomatedFiber Placement (AFP) process, and are all different manifestations of fiber misalignment. Themain driver for these defects are the residual stresses introduced in the tow during the depositionstage by the AFP head. In contrast, the tack between the deposited tape and the substrate is theresisting force against the formation of such defects. Tack may be defined as the ability of amaterial to form a bond immediately on contact with another surface. Tack is a very complexphenomenon that is influenced by a variety of process parameters including temperature, headpressure and speed, as well as degree of cure, moisture content, and surface roughness A physicsbasedmodeling framework for simulation of tack was developed in this study that allows forprediction of tack response. The developed tack model is incorporated in the AFP placementmodelling framework developed to simulate AFP defects.?