Mechanical Characterisation of Extruded PVCu Components

Extruded PVCu door and window frames can distort and bow while in service. The problem is more prevalent and pronounced with dark-coloured frames and with south-facing doors, windows and conservatories. The permanent distortions accumulate progressively over time and there is therefore a time-dependent nature to this problem. 

The mechanisms of distortion have already been identified in an earlier project. In this project, these mechanisms were studied in isolation and their relative contributions to the observed levels of distortion were assessed using a combination of experiments and finite element modelling. One of the primary objectives was to develop strategies for minimising (or eliminating altogether) in-service distortion problems. This strategy has now been incorporated into the manufacturing process for door and window frames that are due to be installed in geographical locations that render them prone to distortion.

The annealing strategy has now been incorporated into the manufacturing process for door and window frames that are due to be installed in geographical locations that render them prone to distortion.