Springforward phenomenon of angular sections of composite materials – analytical, numerical and experimental approach

Zdenek Padovec, Milan Růžička, Hynek Chlup, Vladimír Stavrovský


Residual stresses, which are set in the fiber reinforced composites during the laminate curing in a closed form, lead to dimensional changes of composites after extracting from the form and cooling. One of these dimensional changes is called “springforward” (also “spring-in” or “springback”) of angle sections. Other dimensional changes are warpage of flat sections of composite or displacement of single layers of composite for example. In our case L-section from C/PPS composite with a symmetrical lay-up was analysed. An analytical model which covers temperature changes, a chemical shrinkage during curing and a moisture change was used. There were also a FEM analysis, for predicting the springforward, and experimental analysis carried out.


composite structures; experimental analysis; FEM analysis; springforward phenomenon

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ISSN 1801-1217 (Print)
ISSN 1805-9422 (Online)
Published by the Czech Technical University in Prague, Faculty of Mechanical Engineering