SES test samples

16/03/2022

Author: Philipp Geisler

General, technology, event

Since strength and rigidity are considerably more difficult to predict for a composite monocoque than for a steel tube frame, it is necessary to perform several physical material tests in addition to previous calculations and simulations. During these tests, both flexural strength, rigidity, and perimeter shear strength of the sandwich panels as well as the shear strength of glued lap joints will be determined. The results of these tests are documented in the SES (Structural Equivalency Spreadsheet), which will later be reviewed by the events´ judges. To ensure the safety of all vehicles, the acceptance of a flawless SES is a prerequisite for participation in the events, therefore every step from manufacturing of the samples to documentation of the results is to be done with great diligence.

Currently, we manufacture the SES samples for the monocoque and accumulator container of the RT14evo, which will be tested during the coming weeks. In parallel, the first tests for the RT15 are already planned and executed. These will bring multiple innovations compared to the RT14evo: A new type of carbon fiber and the use of preimpregnated fabrics (prepregs) promise superior material properties. Furthermore, a new aluminum honeycomb, capable of creating three-dimensional bends, is supplied by our sponsor IWE GmbH & Co. KG for the first time, allowing greater freedom of form in the monocoque.

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