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Laminate theory analysis of composites under load in fire

Lookup NU author(s): Professor Geoff Gibson, Dr Peter Wright, Yi-Shan Wu, Emeritus Professor Terry Evans


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Laminate analysis is used to model a loaded composite plate under one-sided heat flux. The input to the laminate analysis comes from a thermal/ablative model, which predicts the temperature evolution through the thickness. It also gives the profile of residual resin content, which reflects the extent of thermal damage. Relationships are proposed for computing elastic constants and other properties as functions of temperature and resin content. The model was applied to a 12 mm thick woven glass/polyester laminate exposed to a heat flux of 75 kWm-2. The laminate A, B and D matrices were modelled, along with the variation of failure loads in compression and tension. The predictions agreed well with experimental values for compression. Both the buckling load, which is proportional √D11D22, and the compressive failure load fall rapidly on exposure to heat flux. The bending/tensile coupling matrix, B, which is zero initially, becomes finite due to the asymmetric thermal profile, then declines as the thermal front progresses. For tensile loading the residual properties after fire were accurately modelled, but the fall in tensile failure load was somewhat over-predicted.

Publication metadata

Author(s): Gibson AG, Wright PNH, Wu Y-S, Evans JT

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 49th International SAMPE Symposium and Exhibition: Materials and Processing Technology

Year of Conference: 2004

Pages: 1393-1404

ISSN: 0891-0138

Publisher: Society for the Advancement of Material and Process Engineering