Abstract The growth behavior of a leaf shape via epidermis cell division is important to design a flexible multi-morphing skin with small/large tangential/normal stiffness. The epidermis cell walls have four unique characteristics: cell unit's concave distribution, low transverse stiffness, high vertical stiffness, and the stiffness continually changes with new circumstances. Inspired by the epidermis cell unit's concave distribution/low transverse stiffness/high vertical stiffness, by theories and experiments is to build a constitutive model for the in-plane compressive sandwich panel with a biomimetic Isosceles Trapezoid Corrugated Lattice Cellular (bio-ITCLC) core. Then the constitutive model introduces a variable stiffness factor that is equivalent to the above changing stiffness characteristic caused by continuous epidermis cell division. On this basis, the bio-ITCLC core made up of movable self-adaptation units is proposed to be one promising supporting structure for helping a flexible multi-morphing skin get the larger normal stiffness without increasing its tangential stiffness.

中文翻译：

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叶生长过程中表皮细胞壁的力学特征为灵活的多变形皮肤提供了灵感

摘要 叶形通过表皮细胞分裂的生长行为对于设计具有小/大切向/法向刚度的柔性多变形皮肤很重要。表皮细胞壁具有四个独特的特征：细胞单元呈凹状分布，横向刚度低，纵向刚度高，刚度随环境变化而不断变化。受表皮细胞单元的凹面分布/低横向刚度/高垂直刚度的启发，通过理论和实验建立具有仿生等腰梯形波纹晶格蜂窝（bio-ITCLC）芯的面内压缩夹芯板的本构模型。然后本构模型引入了一个可变刚度因子，该因子相当于由连续表皮细胞分裂引起的上述变化刚度特性。在此基础上，提出由可移动自适应单元组成的 bio-ITCLC 核心是一种很有前景的支撑结构，可帮助柔性多变形皮肤在不增加切向刚度的情况下获得更大的法向刚度。