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Appears moderately imbalanced

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1. Bistable composite tape-spring (CTS) structures are increasingly used in aerospace engineering due to their ability to fold under large displacements, making them attractive as hinge-safety assemblies with reduced weight and complexity compared to conventional lock-link connections.

2. A novel method has been devised to evaluate the strain evolution in a folded CTS by embedding strain gauges in a sample before rolling the fold through them at a constant angle, providing an exact profile of the strain along the centerline of the structure.

3. The strain has maximum levels at the center of the folded structure, as expected, but a shoulder-like local peak feature is also observed. Finite element analysis is performed to reveal expected levels of strain and fundamental correlations between experimental and FE model results can be drawn for maintaining structural integrity and avoiding damage during and after folding.

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