Forming Mechanism And Application Of Wool Yarn Based On Artificial Muscle Structure

Advanced intelligent textile materials can sense stimuli from the external environment and respond to these stimuli by adjusting the changes in textile structure.As a kind of natural keratin textile fiber,wool fiber has broad research prospects in the field of sustainable intelligent textile materials.Based on the huge moisture absorption potential and hydrodynamic behavior of wool fibers,this topic aims to prepare a series of humidity sensitive wool artificial muscle yarns,and explore their structural properties,forming mechanism and applications,providing ideas and methods for the application of natural fibers in sustainable intelligent textile materials,and helping to further expand the design,development and application fields of textile products.The specific research contents of this topic are as follows:(1)Wool yarn was modified by ultrasonic oxidation method.Orthogonal experiments were designed to explore the main factors affecting the reaction process,and quadratic universal rotary combination design experiments were used to establish regression equations under multiple indicators,and the optimal target process parameters were obtained: the reaction time of HCl and Na Cl O was 32 min,and the time of nano Ca CO3 was 42 min;The wool yarn was treated with the experimental parameter values in the optimized scheme,and the chemical and physical properties of the yarn were characterized.The results showed that the hydrophilic property of wool single muscle yarn was significantly improved,and it had good mechanical properties and stable high moisture absorption expansion,which could be used as an ideal material for preparing artificial muscle structure.(2)The wool artificial muscle yarn is prepared by applying proper twist and load to single or double strands of wool single muscle yarn.Wool twist artificial muscle yarn has a self balanced double winding structure.Its driving,mechanical and recovery properties are tested by setting up a humidity environment,and the structure and external factors affecting the driving performance are explored;Under wet stimulation,the maximum torque angle and speed are 66 ° /mm and 390 rpm respectively,and the torque of muscle yarn is M=46.56 m Nmm/Kg,with good mechanical properties and recovery properties.The wool stretch artificial muscle yarn is made of two single muscle yarns embedded with high twist under sufficient load.The maximum torsional stiffness to maintain the one-dimensional structure is 0.297 m N · m/(rad · mm),and the peak power reached by wet driving is 320 J/Kg;The structure parameters in the twisting process were analyzed,and the stretching stroke and work ability under wet stimulation were evaluated.Based on the self balanced structure of torsion muscle,a high dimension artificial muscle yarn was prepared with stretch wool yarn as the base material,and its response behavior and recovery performance under humidity conditions were characterized.(3)The geometric model of wool twist and stretch artificial muscle yarn was constructed,and the theoretical mechanism and changing rule of its wet driving behavior were studied.According to the structure model of wool twist muscle yarn,the mathematical relationship between the changes of parameters of double ply muscle yarn under wet conditions is derived;The changing trend of torque and torsion energy is analyzed;The strength model of twist muscle yarn is established to prove that the strain of muscle yarn is related to its internal properties,structural offset angle and external load.Furthermore,the forming theory of wool stretch muscle yarn is discussed,and the critical torque of its structure conversion and the shrinkage mechanism of its moisture absorption response are analyzed.(4)Based on the model theory of wool artificial muscle yarn,combined with the wet driving behavior of stretch and twist muscle yarn,the finite element simulation and practical application were carried out.First,create a solid model of wool muscle yarn in Solidworks program,and then import the Ansys analysis software to define materials and properties.Through the formula principle of quasi specific heat conduction and moisture diffusion,simulate the driving process of wool muscle yarn’s moisture response with the heat conduction and static analysis module,and compare and analyze with the actual results.Finally,wool muscle yarn is applied to the preparation of intelligent robot bionic arm with wet response combined with textile processing technology,which opens up a new idea for the potential application of wool artificial muscle yarn in soft robot and intelligent textile field.