Closed-End Composite Tow Layup Analysis for Modulus Consistency
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Solution Overview
Problem
Current designs for composite structures with cylinders and integrated domes suffer from high variability in moduli and 'soft spots' due to restrictive fiber placement, leading to undesirable modulus distribution.
Innovation Solution
A method for analyzing tow layup designs of unitary composite structures with closed end geometries involves constructing a 3-dimensional model, assessing modulus characteristics, and generating results data to optimize fiber distribution and alignment, thereby reducing variability and enhancing moduli consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sequentially terminating scarf is used for fiber placement, then manufacturing process is simplified, but modulus consistency deteriorates due to restrictive fiber placement causing high variability and soft spots
Solution Approach 1:
The patent changes the geometric parameters of the transition region by implementing a double-curved surface with specific radius of curvature (R10-R50) and controlled thickness variation (0.5-2 inches). This geometric parameter optimization allows fibers to follow a more gradual path, reducing placement restrictions while maintaining manufacturing feasibility, thereby improving modulus consistency without sacrificing ease of manufacture
Solution Approach 2:
The patent applies local quality optimization by creating a transition region with distinct geometric characteristics different from the cylindrical and domed sections. The double-curved surface with specific radius and thickness profile is localized at the transition zone to address fiber placement issues specifically where they occur, allowing the rest of the structure to maintain its original manufacturing simplicity
2Device complexity
If traditional tow layup design is used, then manufacturing complexity is reduced, but structural performance deteriorates due to high variability in moduli and soft spots
Solution Approach 1:
The patent introduces a third dimension to the transition region by creating a double-curved surface with curvature in both the circumferential and longitudinal directions. This dimensional complexity allows for optimized fiber routing that reduces variability in moduli, while the analysis system uses 3D modeling to manage the increased design complexity without proportionally increasing manufacturing complexity
Solution Approach 2:
The patent uses computational modeling and simulation to create virtual copies of the tow layup design and analyze modulus distribution before physical manufacturing. This digital copying and analysis allows optimization of the transition region geometry to eliminate soft spots and reduce variability, ensuring structural reliability before committing to physical production
Data Source
AI summary
A method for analyzing a tow layup design of a unitary composite structure with a closed end geometry includes: (1) receiving a design data file for the tow layup design of the unitary composite structure with the closed end geometry from a design data file repository via a communication network and a network interface to a computing device; (2) processing the design data file at the computing device to construct a 3-dimensional model of the unitary composite structure; (3) analyzing the 3-dimensional model at the at least one computing device to assess modulus characteristics of the tow layup design; and (4) generating modulus results data reflecting the modulus characteristics of the tow layup design for the unitary composite structure at the computing device based on the analyzing of the 3-dimensional model. Various examples of methods for analyzing tow layup designs of unitary composite structures with closed end geometries are disclosed.