A finite element modeling method of beam structures using height modification to realize stiffness equivalence
Based on the principle of equivalent stiffness,the FEM modeling of beam structures in civil aircraft de-sign are usually simplified to the combination of rod elements and shear plane elements,which ensures the stiffness of the FEM cross-section almost equal to the designed section,however the areas of the two sections have great difference,thus the FEM results can not accurately reflect the stress in critical positions.To address the deficien-cies in the existing method,a new method in which the height of the FEM cross-section is modified to realize stiff-ness equivalence is proposed in this article.The computation results of the proposed method are compared to the re-sults of the traditional method and experiment results.It shows that the results of the proposed method is more accu-rate than the traditional method and close to the experiment results.This method can be used for finite element mod-eling of civil aircraft structures to simulate real structures more accurately,and the analysis results are also more ac-curate.
civil aircraftbeam structuresstiffness equivalencestressdeflectionfinite element
万方数据
维普
