Xiao Hang, Chen Xi
ICAM, SV Laboratory, School of Aerospace, Xi'an Jiaotong University, 710049, Xi'an, China.
Eur Phys J E Soft Matter. 2015 Sep;38(9):95. doi: 10.1140/epje/i2015-15095-2. Epub 2015 Sep 7.
Based on the observation of overnight hair curling procedure, we establish a mechanical model to describe the temporary wave formation of straight hair (initial curvature is zero), which incorporates the contact between hair and hair roller. Systematic studies are carried out to explore the effects of radius ratio between hair and hair roller, hair's average axial strain, creep time, Poisson's ratio and gravity on the curl retention. The variation of curl retention with respect to time obtained from our numerical model is validated by a simple theoretical model and by overnight curling experiments on hair samples. The results of simulation show that overnight hair curling is suitable to create a wavy hairstyle within about 7 hours, while the combined usage with hair fixatives enables a wavy hairstyle with desired curvature that lasts for a day or more.
基于对夜间卷发过程的观察，我们建立了一个力学模型来描述直发（初始曲率为零）的临时波浪形成，该模型考虑了头发与卷发棒之间的接触。进行了系统研究，以探讨头发与卷发棒的半径比、头发的平均轴向应变、蠕变时间、泊松比和重力对卷曲保持率的影响。通过一个简单的理论模型以及对头发样本的夜间卷曲实验，验证了从我们的数值模型中获得的卷曲保持率随时间的变化。模拟结果表明，夜间卷发适合在大约7小时内打造出波浪发型，而与头发固定剂联合使用则能打造出具有所需曲率且能持续一天或更长时间的波浪发型。
