高性能竞速跑鞋的耐久性如何？
Mechanical resilience of ultra-low-density racing-shoe foams
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中文总结 AI 辅助
本研究表征了精英级竞速跑鞋中底泡沫的力学性能，发现尽管经过300英里使用，泡沫在拉伸、压缩和剪切下的力学响应及能量回弹率基本保持稳定，但存在显著的区域差异，表明其力学韧性可能延长跑鞋功能寿命。
中文摘要 AI 辅助
高性能竞速跑鞋依赖于超低密度弹性体泡沫，这些泡沫在跑步过程中会经历大幅且重复的形变。然而，关于其力学性能在鞋内不同位置的变化以及随重复使用而改变的情况，目前知之甚少。在此，我们表征了一款精英级竞速跑鞋中底泡沫的力学性能，取样自新鞋和一双已穿着300英里的鞋的鞋跟、中足和鞋尖部位。显微镜观察揭示了一个特征孔径尺度为128±18微米，并支持近似各向同性的连续介质描述。随后，我们量化了其在拉伸、压缩和剪切下的力学响应。值得注意的是，尽管经过300英里的实际使用，泡沫在所有三种加载模式和鞋内各区域均保持了其力学响应。能量回弹率基本保持不变，在拉伸和压缩中为85-93%，在剪切中为64-71%。同时，我们观察到显著的区域差异，鞋尖处的拉伸和压缩刚度比鞋跟处低38-51%。泡沫还表现出明显的拉压不对称泊松比。综合来看，这些发现揭示了一种空间结构化和模式依赖的力学响应，该响应在300英里使用后基本保持不变。这种力学韧性可能延长竞速跑鞋的功能寿命，对跑者、更换建议和可持续性具有启示意义。
英文摘要
High-performance racing shoes rely on ultra-low-density elastomeric foams that undergo large, repeated deformations during running. Yet little is known about how their mechanical properties vary throughout the shoe or change with repeated use. Here, we characterize the midsole foam in an elite-level racing shoe from the heel, midfoot, and toe of a new shoe and a shoe worn for 300 miles. Microscopy reveals a characteristic pore length scale of 128+/-18 um and supports an approximately isotropic continuum description. We then quantify the mechanical response under tension, compression, and shear. Remarkably, despite 300 miles of real-world use, the foam retains its mechanical response across all three loading modes and shoe regions. Energy return remains largely unchanged, with values of 85-93% in tension and compression and 64-71% in shear. At the same time, we observe strong regional variations, with tensile and compressive stiffnesses 38-51% lower in the toe than in the heel. The foam also exhibits a pronounced tension-compression asymmetry in Poisson's ratio. Together, these findings reveal a spatially structured and mode-dependent mechanical response that remains largely preserved after 300 miles of use. This mechanical resilience may extend the functional lifetime of racing shoes, with implications for runners, replacement recommendations, and sustainability.
发表机构
- Stanford University（斯坦福大学）
机构由 AI 辅助整理，请以论文原文为准。
