FW: Slicing Softly with Shear

有趣的研究发表在PRL上的（Slicing Softly with Shear）。为什么切肉'拉着'比'硬压'省力。可能实践中好多人都知道，可是真正明白为什么却是比较困难的。

Feed: PRL: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
Posted on: Tuesday, 11 December 2012 2:00 AM
Author: E. Reyssat, T. Tallinen, M. Le Merrer, and L. Mahadevan
Subject: Slicing Softly with Shear

Author(s): E. Reyssat, T. Tallinen, M. Le Merrer, and L. Mahadevan A soft solid is more easily sliced using a combination of normal and shearing deformations rather than diced by squeezing down on it normally with the same knife. To explain why this is so, we experimentally probe the slicing and dicing of a soft agar gel with a wire, and complement this with theory... [Phys. Rev. Lett. 109, 244301] Published Mon Dec 10, 2012

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后记于4－10－2013

看似花哨的研究，其实归根结底还是 一个材料属性的问题，一般材料shear modulus要比Young's modulus小很多，不同变形的难易程度自然可知。解释这两个属性差别的来源可能更有 意义。