Automatic generating method of three-dimensional woven composite hexahedron finite element model

Abstract

The invention discloses an automatic generating method of a three-dimensional woven composite hexahedron finite element model. The method includes the following steps that a space trajectory in the fiber bundle center weaving process is calculated, and position coordinates of the center of each fiber bundle are obtained; position coordinates of space trajectories of center points of the fiber bundles are read, in other words, the position coordinates of each tightened fiber bundle are read, and geometric creation, direction grouping and hexahedron meshing are carried out. By means of the method, the rapid finite element model establishment function of a complex geometric structure three-dimensional woven composite can be achieved only by inputting multiple simple macroparameters. In combination with the geometric structure and finite element modeling, grouping is carried out according to fiber bundle center direction vectors, material spindle direction setting of transverse isotropy materials of the fiber bundles is convenient, the change of internal zone, surface zone and corner zone fiber bundle sections is considered, and transverse isotropy finite element model establishment of the large-size three-dimensional woven composite can be achieved in reality from being manually feasible theoretically.

Description

technical field [0001] The invention belongs to the field of composite material processing, in particular to a simulation method for three-dimensional braided composite materials. Background technique [0002] In order to meet the requirements of high thrust-to-weight ratio, low fuel consumption, low noise, and low maintenance cost of the engine, low-density, high-specific-strength composite materials are used more and more in large bypass ratio turbine engines, and their applications range from static parts Transition to dynamic parts, non-load-bearing parts to load-bearing parts, cold-end parts to hot-end parts, one of the typical applications is the replacement of titanium alloy fans by carbon fiber composite fans. Carbon fiber composite material fan blades are light in weight, corrosion-resistant, low-noise, fatigue-resistant, vibration-resistant, especially anti-flutter, and have high damage tolerance. At the same time, the composite material blades are easily broken i...

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Problems solved by technology

Moreover, the existing three-dimensional braided composite material microstructure characterization is popular to use the representative unit cell method to simplify the scale of the finite element for the overall stiffness prediction and local strength analysis of the material. Due to the use of the unit cell finite element, periodic cycle boundaries must be performed. Conditions are applied to characterize the overall performance of the material, so one-to-one correspondence between the unit cell boundary nodes is required, which makes the finite element modeling process complicated

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