| Rapid Prototyping(RP)technology is a newly developed manufacturing technology,also known as 3D printing technology,which accumulates and forms materials layer by layer.Fused Deposition Modeling(FDM)is one of the most widely used rapid prototyping technologies in today’s world.However,with the manufacturing technology of layer by layer additive material,the scrap rate of 3D printing parts is amazing.In addition,there is basically no pressure process in the forming process,and the connection between layers is not close enough,which makes it difficult for the mechanical properties of 3D printing products to be comparable with those of traditional workpieces.Expansion of the application of 3D printing,its products are increasingly used in mechanical processing,transportation and other practical conditions,so need more actual dynamic characteristics analysis of products,in order to solve the above problems,based on the 3D printing plate as the research object,probe into the influence of process parameters on the FDM parts dynamic performance,and around its mechanism research.The specific research content is as follows:(1)Analytical analysis of dynamic characteristics of FDM 3D printed thin plates,including:taking FDM 3D printed thin plates under cantilever boundary conditions as the research object,a theoretical analysis model of thin plate samples was established based on classical laminated plate theory;Then the bidirectional beam function combination method is used to analyze and deduce the inherent characteristics of the sample.Finally,the vibration response of the sample under pulse excitation was solved by means of mode superposition method,the specific flow of dynamic characteristics of FDM 3D printed thin plate was proposed,and the calculation program was completed.(2)Experimental and simulation studies of thin plate samples,including:first,according to ASTM D63 8 standard,tensile testing machine was used to complete the tensile test of different parts,and the material property parameters of various parts were determined;Then based on the orthogonal test method to complete the preparation of the required thin plate sample,and the hammer method was used to test the inherent characteristics of the sample parameters and vibration response curve,and further determine its damping ratio;In addition,scanning electron microscopy(SEM)analysis was carried out on the surface of these samples to illustrate the influence of process parameter changes on the samples from a microscopic perspective.At the same time,ANSYS Workbench simulation software was used to conduct modal analysis and harmonious response analysis of FDM 3D printed thin plates respectively,so as to obtain the simulation results of natural frequency,modal mode and vibration response of the samples.(3)Research on the characterization of the dynamic properties of samples by different process parameters,including:firstly,the analytical results,experimental test and simulation results of the dynamic characteristics parameters of samples were compared and analyzed,and the correctness of the theoretical analysis model of FDM thin plate was confirmed.Then,the effects of three process parameters of different printing direction,printing layer thickness and path width on the dynamic characteristics of the sample were summarized respectively,and the characterization analysis was completed.Finally,by comparing the results of scanning electron microscopy(SEM),the kinetic properties of the samples were further characterized by the process parameters.In this paper,the influence mechanism of the change of FDM process parameters on the dynamic performance of thin plate samples was studied.The research results are helpful to improve the dynamic performance of FDM products,and provide important reference and technical support for future studies. |
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