Deformation measurements with honeycomb materials for crashpads of balloon gondolas

Details Deformation measurements with honeycomb materials for crashpads of balloon gondolas Deformation measurements with honeycomb materials for crashpads of balloon gondolas

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.471..639s&link_type=abstract

In: 15th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 28 - 31 May 2001, Biarritz, France. Ed.:

Computer Science

Balloons

Scientific paper

For the damping of the touch-down impact of stratospheric balloon gondolas, crashpads of honeycomb materials from cardboard are commonly used. They are designed in a way that they do not buckle, that the kinetic energy of the gondola can be absorbed at their deformation, and that a sufficient braking distance for the gondola is provided by their height. Furthermore their mass and the dependence of their strength properties on the direction of deformation should be as low as possible. To achieve an optimal compromise of these requirements a dataset of strength properties of different honeycomb products has been established. Of particular interest was the absorbable energy if the honeycomb panels are deformed flatwise or at different angles. Altogether 11 products from 3 manufactures have been tested, each at 3 angles of deformation. The average and peak deformation stress as well as the deformation work per volume and mass as functions of the direction of deformation are expressed by polynomials. Correlations between the deformation work and the thickness of the honeycomb panels are looked at.

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