Beijing Institute of Technology

Weidong Song

Lijun Xiao

Song Liu

Genzhu Feng

Disclosed is a thermostatic box for preparing a hydrogel by a freeze-thaw process and a preparation method thereof. The thermostatic box includes a box body. A top of the box body is provided with an upper cover plate. A front side of the box body is provided with a front cover plate. Air outlet holes are disposed in the upper cover plate. A storage chamber and a drainage chamber are disposed in box body. The storage chamber is located on an upper side of the drainage chamber. Porous storage platforms are disposed in the storage chamber. A side of the plurality of porous storage platforms is provided with a first blowing mechanism. An area of a right side of the drainage chamber and a lower side of the porous storage platforms is provided with a second blowing mechanism. A side of the drainage chamber is provided with a drainage hole.

Thermostatic boxes for preparing hydrogels by freeze-thaw processes and preparation methods thereof

Disclosed is a method for designing a gradient minimal surface structure based on a surface density distribution. The method comprises initializing pending parameters of a two-dimensional surface equation and a minimal surface equation in a system; generating a plurality of pending parameter sets based on initial values and preset ranges of the pending parameters of the two-dimensional surface equation and the minimal surface equation using a CSPRNG; establishing a plurality sets of two-dimensional surface equations and a plurality sets of minimal surface equations; establishing a plurality of gradient structure equations; generating a plurality of three-dimensional models of minimal surface structures; making a plurality of gradient structure specimens by an additive manufacturing technique; obtaining a plurality sets of structure stress-strain curves and force-displacement curves by performing a test; calculating a platform stress and an energy absorption of the plurality of gradient structure specimens; and determining target structure types to realize an optimized design of the gradient minimal surface structure based on the surface density. The mechanical response stability and the energy absorption performance of the minimal surface structures can be improved.

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Beijing, China

Weidong Song