A new perspective on the needle-puncture property of silkworm cocoons with a hierarchical multi-layer structure

In present study, we focused on the hierarchical needle-puncture properties of silkworm cocoon aiming to capture a clear regularity from the inside to outside. To realize this target, we firstly conducted the peeling operation manually on silkworm cocoon to get specimens of 7 layers, 8 layers, and 9 layers. Subsequently, we investigated the surface morphology of each layer and puncture resistance of each component layer to better understand the...