Colloquium announcement

This is a concept which has not been approved.

Faculty of Engineering Technology

Department Production Technology (MS3)
Master programme Mechanical Engineering

As part of his / her masterassignment

Amir Ahmad Bakhtiary Davijani

will hold a speech entitled:

Experiments and prediction of the spreading behavior of fibrous tows by means of the Discrete Element Method

Date03-07-2012
Time10:00
RoomHorstring N109

Summary

Fiber reinforced composites are materials made of two or more constituent materials, being a matrix, such as a polymer, and a reinforcement, for instance fibers. The performance of these materials depends on the behavior of each constituent and the interaction between them as a whole. A single tow consists of thousands of filaments which are bundled together and may be used as it is or further processed and woven into a fabric. Due to its discrete nature the tow shape can significantly change under loading. The shape of the tow can have an impact on several production and performance aspects. For instance, tow deformation can influence the permeability of a fabric during resin impregnation. It can also affect the dimensions and thickness of products, for example in braiding or filament winding processes.

This master project focused on modeling the spreading behavior of continuous fiber materials. Several experiments were carried out under different conditions to better understand the spreading behavior and also validate the model. The Discrete Element Method was used to predict the tow spread, shape and structure by modeling the individual filaments of the tow. During the experiments it was determined that the main mechanisms playing a role in tow spread are the setup geometry, sizing and twist and within the range of measurements friction and tow tension had no significant effect. Currently the model can predict the effect of setup geometry and the presence of sizing well within 10 percent of the experimental results.