Finite element modeling method for variable stiffness composite laminate

Abstract

The invention discloses a finite element modeling method for a variable stiffness composite laminate. The method includes performing programming through Python and a PCL language; directly extractingthe fiber angle and node information of a laminated plate shell unit in a finite element model established by a Patran finite element through an operation file; calculating a central node coordinate of each shell unit, if the size of the shell unit is relatively small, approximately regarding the fiber angle of the point as the fiber angle of the unit, and finally re-endowing the fiber angle of each shell unit with the attribute of the shell unit according to a set curve track, thereby realizing fiber curve laying of the laminated plate. A variable stiffness laminate model is obtained by combining Patran and Python, then the model is submitted to Nastran to be solved and analyzed, and visualization processing is carried out through Patran import. According to the method, two programming languages of Python and PCL are combined, other platforms are not needed, and finite element modeling of the variable-rigidity laminated plate can be achieved through Patran.

Description

technical field [0001] The invention relates to a modeling method for a variable stiffness composite material laminate, in particular to a modeling method for a variable stiffness composite material laminate based on Patran and Python. Background technique [0002] Traditional composite materials have been widely used in many fields such as aerospace, mechanical construction, transportation and medical instruments due to their excellent mechanical properties such as high specific stiffness, high specific strength and strong designability. Composite materials are the most promising and vital materials in response to the development of the times and scientific needs, and have gradually become a substitute for metal alloys. The use of high-strength and light-weight composite materials can not only reduce the structural quality, but also reduce fuel consumption. At the same time, with the in-depth research on composite material manufacturing and molding techniques, the use of co...

AI Technical Summary

Problems solved by technology

However, when using this method of combining multiple languages ​​for secondary development of software, some programs need to be modified according to the compatibility requirements between software, which will lead to some unnecessary errors and affect subsequent research progress

[0005] Since the existing finite element software such as ANSYS, MSC.Patran and ABAQUS can complete the simulation of laminates with linear fiber laying, but for the modeling of variable stiffness laminates, there is no corresponding curve layup modeling module in the software. Therefore, it is not possible to directly model in the finite element software, and it is necessary to use other software or secondary development of the finite element software to establish a variable stiffness analysis model, which is troublesome and time-consuming

Images