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A Triangular Envelope Based Method for Predicting the Strength of Composite π-Shaped Non-planar Bonded Joints

A composite material and connection strength technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of long development cycle and high cost, and achieve the effect of reducing test cost, simplifying calculation process, and shortening development cycle.

Inactive Publication Date: 2016-01-20
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in engineering applications, we can only rely on a large number of tests to determine the strength of non-planar adhesive connections of complex composite materials, which leads to long development cycles and high costs.

Method used

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  • A Triangular Envelope Based Method for Predicting the Strength of Composite π-Shaped Non-planar Bonded Joints
  • A Triangular Envelope Based Method for Predicting the Strength of Composite π-Shaped Non-planar Bonded Joints
  • A Triangular Envelope Based Method for Predicting the Strength of Composite π-Shaped Non-planar Bonded Joints

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Effect test

Embodiment 1

[0041] Example 1: Prediction of π-shaped non-planar adhesive connection strength of composite materials

[0042] 1. Geometric description:

[0043] The composite material π-shaped non-planar adhesive connection structure is 200mm long, 160mm high, and 50mm wide. It is divided into three parts: skin, web and π reinforcement. π reinforcement includes L layup, U layup, and one-shape layup. And the packing area, each part is ideally bonded with adhesive, and the material is T700 / QY8911.

[0044] (1) Left and right layer of web: [0° / 0° / 45° / -45°] s , each with a thickness of 1mm;

[0045] (2) Upper and lower layers of skin: [45° / 90° / -45° / 0°] s , each with a thickness of 1mm;

[0046] (3) π-reinforced layup: L layer and U layer are [45° / 90° / -45°], one-shape layer is [-45° / 90° / 45°], each thickness is 0.36mm, filler It is a 0° unidirectional belt, and the 0° direction is along the width direction of the π joint.

[0047] 2. Finite element model establishment and strength predict...

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Abstract

The invention relates to a method for predicating composite material Pi-shaped non-planar glue joint strength based on triangular envelopes. The method includes the following steps that (1), according to parameters of a composite material Pi-shaped non-planar glue joint structure, a geometrical model is established; (2), according to actual working conditions of the composite material structure, loads and boundary conditions of the Pi joint geometrical model are determined; (3), grid partition is performed on the joint geometrical model, and a Pi joint three-dimensional finite element model is obtained; (4), on the basis of the Pi joint three-dimensional finite element model, a finite element stress analysis is performed; (5), according to the linear finite element stress analysis result, a curved edge triangular envelope route of a Pi negative moment steel padding region is set on the basis of the Pi joint three-dimensional finite element model, all stress component values on the curved edge triangular envelope route are extracted, and the average value of the stress component values is calculated and substituted to the failure criterion for predicating the strength. The method for predicating the composite material Pi-shaped non-planar glue joint strength based on the triangular envelopes is suitable for engineering application and can obviously shorten a development cycle and reduce experimentation cost.

Description

technical field [0001] The invention relates to the strength prediction of typical non-planar adhesive joints of integrated composite material structures, and is suitable for complex composite non-planar adhesive joint structures widely used in aerospace vehicles. Background technique [0002] Composite materials are widely used in aerospace vehicle structures due to their excellent properties such as high specific strength, high specific stiffness and tailorable design. Composite material adhesive connection is an efficient connection part in the overall composite structure, which is divided into planar adhesive connection and non-planar adhesive connection. The non-planar adhesive connection can realize the composite material with a certain angle due to the ability to transfer out-of-plane loads. It is applied to the connection of components in complex composite structures. However, the connection structure is also a key part that determines the structural strength of com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 赵丽滨山美娟张建宇
Owner BEIHANG UNIV
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