Design of curved fiber paths for composite laminates

A composite material and laminate technology, which is applied in the design field of curved fiber paths for composite laminates, can solve the problems of low design efficiency, high cost of thickness accumulation, and high cost

Active Publication Date: 2012-12-26
THE BOEING CO
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AI Technical Summary

Problems solved by technology

Steering fiber ply design methods have heretofore usually directly represented the fiber angular distribution (e.g. as a Bezier surface), which has the disadvantage that, in addition to the simplicity of the angular distribution, it is expensive to calculate the thickness accumulation associated with a given angular distribution
This leads to potentially designing

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  • Design of curved fiber paths for composite laminates
  • Design of curved fiber paths for composite laminates
  • Design of curved fiber paths for composite laminates

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Embodiment Construction

[0044] The following disclosure is the result of the development and validation of an optimization process for the design and analysis of variable stiffness composite skins. In the course of this work, the potential feasibility and weight reduction of fiber steering for laminated structures was investigated.

[0045] The design process disclosed here allows loads to be steered by steering fibers. Conventional laminates carry in-plane loads around the cut by transferring the load between the plies (eg, from 0° ply to ±45° ply). Loads can be carried more efficiently around cuts when fibers are allowed to follow curved paths within the ply. The challenge in designing laminates with steered fibers is to efficiently describe the manufacturable fiber paths. A potential outcome is a reduction in weight and cost of the final fabricated structure.

[0046] For conventional plies on flat panels, the fiber paths are all described by the ply angle. For conventional laminates, the ply ...

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Abstract

A computational optimization process uses the variable stiffness performance of composite laminates attributed to steered fiber to guide the design of stream functions describing the fibers to build it. This design process combines a finite element-based analysis tool, failure criteria and geometry optimization to determine steered angles associated with stream functions by an optimization program to meet target performance requirements, e.g., load condition(s), and failure criteria for quasi-static or dynamic events. The fiber angle distribution and thickness buildup are computed based on the stream function. The simulated structure is analyzed using finite element analysis. The disclosed process allows the designer to impose manufacturing constraints such as fiber steering radius.

Description

technical field [0001] The methods disclosed herein generally relate to systems and methods for producing composite laminates using tow placement technology. In particular, the methods disclosed here relate to the automated design of variable stiffness composites consisting of plies with spatially varying fiber orientations. Background technique [0002] Fiber-reinforced composites contain fibers embedded in a matrix material, such as thermoset and thermoplastic polymeric resins. The fibers carry loads and provide strength and rigidity. Tape layers in composite materials have high strength and stiffness in the direction of the fibers and lower strength and stiffness in the direction perpendicular to the fibers. [0003] Advanced fiber placement, also known as "tow placement technology", is an automated process used to create composite laminates. Many narrow strips (ie, "tows") of slotted prepreg tape lie on the surface of parallel tow bands (called "courses"). This techn...

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Application Information

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IPC IPC(8): G06F19/00
CPCG06F17/5095G06F17/5018G06F30/23G06F30/15G06F30/00G06F2113/26
Inventor M·罗斯艾恩M·T·格雷姆肖T·A·格兰蒂M·S·帕特森
Owner THE BOEING CO
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