Objective This research project aims at delaying the onset of interfibre/matrix cracking in multilayer CFRP composites by applying design/manufacturing means, which are in analogy to the concept of prestressed concrete. Two major routes are being studied: Controlled expansion of a composite structure by using an expandable mandrel. Expansion is either done after filament winding, but prior to completion of gelling/curing or on a finished standard wound structure at a temperature above the glass transition point with final release of the expansion loads after cooling down. Stress relief of standard wound structures by submission at elevated temperatures to stresses similar to those experienced in later operation followed by cooling down to ambient temperature prior to unloading. For certain CFRP structures, precompression of the matrix can be achieved using an expandable mandrel. This leads to an increase in the tolerance stress/strain range as the threshold for interfibre/matrix cracking and thus first ply failure moves toward higher strain values. Fields of science engineering and technologymaterials engineeringcompositescarbon fibers Programme(s) FP1-EURAM - Research programme (EEC) on materials (raw materials and advanced materials) - Advanced materials (EURAM) -, 1986-1989 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator Urenco Ltd EU contribution No data Address 18 Oxford Road SL7 2NL Marlow United Kingdom See on map Total cost No data Participants (2) Sort alphabetically Sort by EU Contribution Expand all Collapse all MAN Technologie AG Germany EU contribution No data Address Bauschinger Straße 20 80997 München See on map Total cost No data RISO NATIONAL LABORATORY Denmark EU contribution No data Address Frederiksborgvej 399 See on map Total cost No data
