Mechanical Analysis And Structural Optimization Of Puncture Template With Equidistant And Closely Spaced Micropores

Piercing template is used in the integrated piercing process of orthogonal laminated woven fabrics. Because of piercing template with nearly a thousand closely aligned small holes, finite element method (FEM) can not analyze its mechanical behavior and optimize its structure design. In this study, the mechanical behavior of piercing template were analyzed by pseudo-plates theory.According to the pseudo-plates theory from two angles, by substituting the effective solid plate for piercing template, the effective modulus was obtained. There are two method to get the effective modulus. One is use the homogenization theory. The other is use the elastic theory. ANSYS is adopted to implement the numerical calculation of the effective modulus to obtain the effective solid plate and the characteristic relation curves of the quantity of holes and the degree of weakness of the elasticity modulus.Using the effective solid plate in static analysis, concluded that the deflection of the piercing template in the actual working condition. Then the equivalent modulus of elasticity is applied to the estimation formula of equivalent thickness.In the same way, it can also use the effective solid plate to analyze the dynamic parameters, showing that the frequency and amplitude of piercing template.Then according to the results of the analysis.this paper discussed the connection between the hole density and the parameters of the vibration.The study found that with the increase of hole density, the natural frequency reduced.Structural optimization design of the piercing is completed on the basis of mechanics analysis with the help of ANSYS APDL.Firstly, this paper briefly introduces the subproblem approximation method and the first order optimization method.Secondly, the optimization model and steps of the piercing by the APDL are described in detail.Then two thickness optimization solutions are obtained through using two methods embedded the software. Finally.the typical problems are summarized when using the ANSYS in the structural optimization design and the reasons are analyzed according to the theory of optimization design.Because the finite element method is used in the process of solving the equivalent elastic modulus, the result of the effective modulus is affected by the number of nodes by the FEM. Experiment is designed in this paper in order to verify the conclusions of the theoretical research. The experimental results are in accord with the numerical calculations with comparatively satisfaction when the hole density between 20% and 50%. The homogenization theory is more reliable when the hole density above 50%. In general, the effective modulus through the homogenization theory is more safe compared to the elastic theory, but it is simpler to implement by the elastic theory.