A fast equivalent modeling method for composite thin-walled bolted composite structures

A composite material and combined structure technology, applied in the field of effective modeling, can solve problems such as low computational efficiency, and achieve the effect of reducing the number of grids

Active Publication Date: 2022-08-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low calculation efficiency of composite thin-walled bolted composite structures under the premise of ensuring calculation accuracy, thereby providing a fast equivalent modeling method for composite thin-walled bolted composite structures

Method used

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  • A fast equivalent modeling method for composite thin-walled bolted composite structures
  • A fast equivalent modeling method for composite thin-walled bolted composite structures
  • A fast equivalent modeling method for composite thin-walled bolted composite structures

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specific Embodiment approach 1

[0037] Embodiment 1: Combining figure 1 To specifically describe this embodiment, a method for rapid equivalent modeling of composite thin-walled bolted composite structures described in this embodiment includes the following steps:

[0038] Step 1. Import the solid model, identify the bolt, pick up the geometric information of the bolt, determine the corresponding clamping surface of the bolt, the total number of clamping surfaces and the affected area corresponding to each clamping surface according to the geometric information of the bolt, and delete the bolt;

[0039] Step 2. Delete the parts that can be ignored by equivalent modeling;

[0040] Step 3. Shell the thin-walled parts and record the corresponding thickness information;

[0041] Step 4. Delete the hole edge circle line of the bolt hole on the shell;

[0042] Step 5. According to the geometric information obtained in step 1, the center of any circular surface of the bolt rod, the corresponding clamping surface ...

specific Embodiment approach 2

[0049] Specific implementation mode 2: Combining figure 2 This embodiment is specifically described. This embodiment further describes the rapid equivalent modeling method for a composite thin-walled bolted composite structure described in Embodiment 1. In this embodiment, in step 1, the geometry of the bolt is The information includes the center, radius and geometry of the smallest cube occupied by the bolt.

[0050] The only parts really needed in the equivalent model are thin-walled parts (ie, connecting plates) and some thin-walled parts that cannot be shelled, so the first step in modeling is to delete redundant parts. In these parts, the information of the bolt determines the establishment of the equivalent connection unit, so the information of the bolt should be recorded when deleting the bolt. like figure 2 As shown in the figure, according to the characteristics of the cylinder drawing, the number of adjacent surfaces of the bolt shank circular surface is 2, and ...

specific Embodiment approach 3

[0052] Specific implementation three: combination image 3 and Figure 4 This embodiment is specifically described. This embodiment further describes the rapid equivalent modeling method for a composite thin-walled bolted composite structure described in Embodiment 2. In this embodiment, in step 2, the value can be ignored. The maximum surface area of ​​the part is the judgment value. When the area of ​​the part is smaller than the judgment value, the part will be deleted, otherwise it will not be deleted.

[0053] This implementation is used to delete redundant small parts. The negligible small parts in the equivalent modeling are mostly nuts, such as image 3 As shown in the figure, because the information of the nut is not needed when establishing the equivalent connection unit, the maximum surface area of ​​the part can be used as a judgment condition, and a reasonable value (determined based on the size of the nut) can be given to delete the nut. For a combined structur...

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Abstract

A rapid equivalent modeling method for composite thin-walled bolted composite structures relates to the technical field of rapid equivalent modeling of composite thin-walled bolted composite structures. computationally inefficient problem. The invention includes picking up the geometric information of the bolt, determining the corresponding clamping surface of the bolt, the total number of clamping surfaces and the influence area corresponding to each clamping surface according to the geometric information of the bolt, deleting the bolt, and deleting the parts whose equivalent modeling can be ignored. ; Shell the thin-walled part and record the corresponding thickness information; Delete the hole edge circle line of the bolt hole on the shell; Establish an equivalent connection element and assign equivalent connection stiffness to the composite material of the equivalent connection element; Assign properties to the shell; The shell is meshed; the binding and contact settings between adjacent shells are set according to the influence area to complete the modeling. The invention is suitable for modeling thin-walled bolted composite joints.

Description

technical field [0001] The invention relates to the technical field of rapid equivalent modeling of composite thin-walled bolt connection composite structures. Background technique [0002] In order to meet the requirements of light weight, high efficiency and low cost, composite connection structures appear in large numbers in the structure of high-speed aircraft components. For the research of high-speed aircraft, its service environment is harsh, especially for the stress field of the local connection structure. Restricted by the complex stress distribution and contact nonlinearity at the edge of the hole, in order to pursue the calculation accuracy to guide the design, the existing modeling methods are mostly used to describe the complexity of the problem through refined solid modeling. In the sample-level model, more accurate calculation results can also be obtained by reducing the efficiency, but for thousands of connected structures in the component-level structure, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/15G06F30/20G06F119/14G06F111/04G06F113/26
CPCG06F30/17
Inventor 方国东付茂青梁军吴增文刘硕
Owner HARBIN INST OF TECH
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