Fibre reinforced polymers (FRP) offer a high potential to reduce kinetic energy. As a consequence
of this, fibre reinforced polymers often have a higher risk of being exposed to impact loads. The
knowledge of the mechanisms and of the material loading during and shortly after an impact load is
essential for an ‘impact-load-monitoring-system’ to predict possible structural failures. Especially a
prognosis of structural failures caused by – often unrecognized - barely visible impacts is an
important factor. Primary impact damages often leads to a sudden structural failure. These
unheralded failures seems to be one of the most important problems in product development for the
aircraft industry. By measuring the structural response at several discrete measurement points an
impact can be detected, reconstructed and also rated.
Structural failure of fibre-reinforced polymers (FRP) caused by impact is an important factor in product development
for the aircraft industry. Therefore it is necessary to obtain knowledge of the mechanisms and of the material loading
during and shortly after an impact load. On account of this a Finite-Element-Model was developed with the goal to
deduce design rules for impact tolerant composite materials.
To verify and validate the Finite-Element-Model it is essential to have information of the state of stress on the surface
of the FRP shortly after the impact. An impact test device was developed at the University of Bremen. The time
variable, stress and strain conditions in composite plates are measured using photoelastic technique, strain gauges and
holographic interferometry.
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