The puncture resistance of Bombyx mori silk cocoons (Data)

Data for the paper "The puncture resistance of Bombyx mori silk cocoons", the abstract for which follows: This paper considers the puncture resistance of both Bombyx mori full cocoons (FC) and cocoon wall cutouts (CWC) subjected to the conditions of dynamic and static loading. The behaviour of both FC and CWC was characterised by assessment of deflection, needle penetration, and perforation. The apparent cocoon area was found to reduce linearly during puncture, reaching 8.3% of its initial value ( 0.05), with 89% of the puncture sabot kinetic energy dissipated during penetration, demonstrating efficiency in energy absorption. Strain measurements reveal equatorial strain to be 0.16 while meridional strains are measured at 0.01. Auxetic behaviour is noted to occur along the meridional axis of full cocoons with a Poisson’s ratio recorded at -0.004. Comparing this to the equatorial Poisson’s ratio of 0.11 in full cocoons, highlights anisotropy of the cocoons. The uniform geometry of the needle radially distributes load. Although puncture strengths do not differ statistically, static tests reveal distinct force–displacement behaviours, with FC materials exhibiting ductile toughening prior to failure, and CWC materials linearly strain stiffening prior to brittle rupture. Failure initiates via interlaminar shear from sericin bond cracking, which progresses due to fibre displacement and stretching, culminating in rupture propagation while opposing compressive forces induce frictional and tensile fibre failure. These findings elucidate the cocoon’s adaptive defence strategies, offering potential insights for bioinspired puncture-resistant materials.

本数据集支撑论文《家蚕蚕茧的抗穿刺性能》（"The puncture resistance of Bombyx mori silk cocoons"），该论文摘要如下：本文研究了家蚕完整蚕茧（full cocoons, FC）与蚕茧壁切块（cocoon wall cutouts, CWC）在动态与静态载荷下的抗穿刺性能。通过对变形、针头穿刺与穿孔行为的表征，对FC与CWC的力学行为进行了分析。研究发现，穿刺过程中蚕茧的表观面积呈线性衰减，最终降至初始值的8.3%（*p*<0.05）；穿刺过程中，穿刺工装89%的动能被耗散，证明其具备优异的能量吸收效率。应变测试结果显示，蚕茧的赤道方向应变为0.16，而经向应变为0.01。完整蚕茧的经向轴呈现拉胀行为（auxetic behaviour），其泊松比（Poisson’s ratio）为-0.004。将该值与完整蚕茧赤道方向0.11的泊松比进行对比，可凸显蚕茧的各向异性特性。针头的均匀几何结构可实现载荷的径向均匀分布。尽管穿刺强度在统计学上无显著差异，但静态测试结果显示二者的力-位移行为存在显著区别：FC样本在失效前呈现韧性增韧行为，而CWC样本则在脆性断裂前表现出线性应变硬化行为。材料失效首先由丝胶蛋白（sericin）键断裂引发层间剪切，随后随着纤维位移与拉伸不断发展，最终导致断裂扩展；与此同时，反向压缩力会引发纤维的摩擦与拉伸失效。上述研究结果阐明了蚕茧的适应性防御策略，可为仿生抗穿刺材料的研发提供潜在的理论参考。