Study and application of tensile properties of porous grafted structures with negative Poisson ratio
To determine the influence of different auxiliary incisions on the expansion performance of skin graft,the extensibility and application of porous graft structure were studied.Firstly,triangular and square elements were introduced,and transfer structures with different unit angles were constructed through the rotation migration of elements and the coupling of nodes.The tensile expansion test system of digital image correlation method was established to study the tensile expansion test of various transplanted structures.According to the results of tensile strain measurement,a characterization method with equivalent Poisson ratio as the tensile parameter was established,and the optimal tensile structure was selected with the tensile stress and equivalent Poisson ratio as the evaluation index.Finally,the optimal incision structure was applied to the patient's hand wound,and compared with the traditional non-incision structure for skin transplantation,to verify the effectiveness of the auxiliary incision for skin graft expansion and tension reduction.The results show that the tensile properties of triangular transplanted structures are obviously better than those of square grafts,and the tensile properties of both structures decrease with the increase of the element angle.The selected 0° triangle unit structure has better tension and tension reduction characteristics in the application of hand wound transplantation,and the suture stress generated after skin suture is minimal.
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