Clothing Pressure Test And Numerical Simulation Based On The Human Arm Model

Pressure garment that can exert certain clothing pressure plays an important role in preventing and controlling scar hyperplasia in patients with moderate to severe burns.At present,even if people select the best pressure clothing material and adopt the most advanced pressure clothing making method,the pressure clothing made for specific bum patients can not exert the clothing pressure which is most suitable for controlling scar hyperplasia at the affected area at the first time,due to individual differences and irregularity of body surface.So only by wearing a suit of pressure clothes and testing the clothing pressure at the affected area of patients many times can the pressure garment meet the requirements.Burned patients need to wear pressure clothes at the early stage of healing,but the trial process of pressure garment brings much pain to patients,which is self-evident.Therefore,it is necessary to explore the human model which can replace the real human body to make pressure clothes and test the pressure of clothing,in order to alleviate the pain of patients and improve the efficacy of pressure garment.In addition,due to the limitations of current clothing pressure testing and evaluation methods,it is difficult to accurately grasp the size and distribution of clothing pressure,which affects the precise design of pressure garment and the efficacy of pressure therapy.In order to explore the best human arm model to replace the real human arm for pressure clothing production and garment pressure test,firstly pressure arm sleeves were made,then five kinds of human arm models based on laser scanning data were printed and made,finally the clothing pressure were tested after the arm sleeve is put on the human arm model and the real human arm.The size and distribution of clothing pressure on real human body and arm models are compared and analyzed.So the results show that after wearing pressure arm sleeve,the size and variation of garment pressure on the model,of which the hardness is the closest to that of the real human body,are very close to the results of garment pressure test on the real human arm.The corresponding hardness and elastic modulus of the model can provide a reference for making the model parameters instead of the real human body.The hardness and modulus of elasticity are inversely proportional to the garment pressure after wearing the pressure arm sleeve.After wearing a pressure sleeve on real human arm and arm models,the measured garment pressure increases with the increase of arm circumference,and it’s the same on the contrary.In order to grasp the size and distribution of clothing pressure accurately,the CT data of human arm were processed by MIMICS medical software to reconstruct the three-dimensional human arm model firstly.Then the surface of the model was optimized in 3-Matic to generate the ideal tetrahedral mesh type.Finally it was imported into the finite element software to establish a human arm model with multiple materials is constructed,and the pressure arm sleeve is put on the arm model to simulate the size and distribution of clothing pressure.The results indicate that the numerical simulation method can visually show the stress and strain of the arm when the pressure arm sleeve acts on the human body.The simulated clothing pressure(stress)increases with the increase of arm circumference size,which coincides with the change trend of the physiological curvature of the arm surface.The clothing pressure at the protruding parts of the arm increases and the pressure with the concave parts of the arm decreases accordingly.The clothing pressure distribution of numerical simulation is consistent with that of actual measurement.Finally,the arm model which can replace the real human arm is made based on CT data,and the pressure arm sleeve is made according to the size of the arm model.The clothing pressure exerted by the pressure arm sleeve on the arm model is tested and compared with the numerical simulation results.The results show that the overall trend of the four special girths and four special lengths of the human arm is basically the same as that of the numerical simulation,but the clothing pressure simulation value is smaller than that of the test value.The overall deviation between the test value and the simulation value is not large,which shows that the numerical simulation results of the size and distribution of garment pressure in this study are close to the actual situation of garment pressure,and it can provide theoretical reference for grasping the situation of garment pressure and optimizing the size of pressure clothing.