Unlock instant, AI-driven research and patent intelligence for your innovation.

A Design Method for Composite Stringers with Notches

A composite material and design method technology, applied in the direction of chord/longeron, wing, transportation and packaging, etc., can solve the problem that the height of the wing rib cannot meet the requirements of the gap of the open long truss

Active Publication Date: 2021-10-15
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The task and purpose of the present invention is to propose a notched composite material stringer, which is especially suitable for the airfoil structure with low airfoil height, and solves the situation that the height of the rib cannot meet the requirements of the gap of the open stringer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Design Method for Composite Stringers with Notches
  • A Design Method for Composite Stringers with Notches
  • A Design Method for Composite Stringers with Notches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] According to the load of the girder, design the composite T-shaped girder layup; design the notch size of the girder according to the position and size of the rib; design the widened beam at the bottom edge, the bevel angle of the web and the bottom edge, etc. to meet the strength requirements Figure 4 The above parameters; both ends of the stringer are designed to widen the bottom edge of the beam, as well as the chamfered corners and rounded corners of the web and bottom edge according to the quantity, side distance and end distance of the stripped fasteners. Manufacture according to the above design drawings.

[0034] A composite material long stringer with a notch, on the basis of a common T-shaped composite material long stringer, a rib is added to the stringer web machine to pass through the gap, and the bottom edge of the stringer at the gap is widened. In order to ensure the smooth transmission of the long girder load, Figure 4 The following parameters must b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of aircraft structure design, and in particular relates to a design method for a long truss of composite material with notches. It includes the following steps: design the non-notched composite girder, the opening rib on the girder web through the gap, design the chamfer angle at the notch of the girder, design the widened bottom edge near the notch of the girder, design the end of the girder, and design the girder Iterative optimization of parameters. There is no need to make notches to the wing ribs, thereby avoiding weakening the strength of the ribs. Especially for the airfoil structure with low airfoil height, the rib height is very low, it is difficult or even impossible to meet the requirements of notching, this kind of long stringer with notches is very suitable. After the ribs of the girder web pass through the notch, the bottom edge is widened and reinforced, and the web and the bottom edge are bevelled to gradually realize the transition of the load and ensure the smooth transmission of the load along the girder.

Description

technical field [0001] The invention belongs to the field of aircraft structure design, and in particular relates to a design method for a long truss of composite material with notches. Background technique [0002] The spatial coordination relationship between stringers and ribs in airfoil structures is usually as follows: figure 1 As shown in Fig. 1, the design scheme opens gaps for the girders on both sides of the rib flange, which has the advantage of making the girders pass through along the span direction, ensuring the continuity of the load transmission of the girders, and thus ensuring the stability of the panel. Its disadvantage is that the strength of the rib is correspondingly weakened after many gaps are opened in the rib. [0003] In particular, for the airfoil structure with a low airfoil height, after the ribs are opened and the girders pass through the gap, the remaining effective cross-sectional area of ​​the web is greatly reduced, and it cannot even meet ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B64C3/18
CPCB64C3/185
Inventor 郑青泉何四海高伟
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA