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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Shape and Stiffness Switchable Hydroplastic Wood with Programmability and Reproducibility.

Tao Zhang1,2,3, Daotong Zhang1,2,3, Weimin Chen1,2,3

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Summary

This study introduces "hydroplastic wood," a sustainable material with switchable shape and stiffness. It utilizes a facile solvent casting method for advanced structural engineering applications.

Keywords:
cell-wall wettinghydroplastic woodliquid−liquid interfacemoisture evaporationwettability

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Area of Science:

  • Materials Science
  • Sustainable Engineering
  • Wood Science

Background:

  • Stiffness-switchable materials offer potential in structural engineering but face limitations due to petroleum-based monomers and high energy demands.
  • Current methods for manipulating wood's mechanical properties are often energy-intensive and rely on synthetic components.

Purpose of the Study:

  • To develop a sustainable and facile method for creating shape and stiffness-switchable hydroplastic wood.
  • To enable the fabrication of thick wood components with enhanced formability and mechanical properties.

Main Methods:

  • A solvent casting strategy involving cell wall wetting, softening, and moisture evaporation was employed.
  • A low surface tension, low viscosity wetting agent was used to enhance wood surface wettability and cell wall softening.
  • Capillary forces during moisture evaporation facilitated self-densification of cellulose nanofibrils for shape design.

Main Results:

  • The developed hydroplastic wood exhibits switchable shape and stiffness properties.
  • The method successfully processed thick wood samples (Balsa and Pinewood) through hydro-plasticization.
  • Moisture-mediated shape design was achieved via periodic saturation-dehydration cycles.

Conclusions:

  • Hydroplastic wood fabricated through this sustainable method is a promising engineering material.
  • The material combines strong durability, excellent formability, and significant load-carrying capacity.
  • This approach overcomes limitations of traditional stiffness-switchable materials by using a sustainable, low-energy process.