Composite Laminate Scarf Repair with Optimized Ply Templates
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Solution Overview
Problem
Current scarf repair methods for composite structures are time-consuming and labor-intensive, prone to errors due to manual ply cutting, which can lead to reduced structural strength or excessive stiffness in the repair area, as they rely on visual identification of ply boundaries and fiber orientations that may be difficult to discern.
Innovation Solution
A system and method for simulated scarfing and patching that uses a computer-based approach to optimize repair designs, adjusting scarf taper ratios and generating precise machining code for automated or semi-automated processes, ensuring accurate material removal and patch placement based on the underlying ply geometry and fiber orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual ply cutting is used with visual identification, then the repair process is simple and requires minimal equipment, but the manufacturing precision deteriorates due to errors in identifying ply boundaries and fiber orientations
Solution Approach 1:
The patent uses templates that replicate the exact geometry and fiber orientation patterns of the original composite plies. These templates serve as accurate copies that guide the cutting process, eliminating the need for visual identification of ply boundaries while maintaining high manufacturing precision. The templates are designed to match the specific laminate stacking sequence and fiber orientations of the component being repaired.
Solution Approach 2:
The patent prepares templates in advance that encode all the necessary geometric information about ply boundaries and fiber orientations before the actual repair process begins. This preliminary action of creating accurate templates eliminates the need for real-time visual identification during cutting, thereby improving manufacturing precision without adding significant equipment complexity.
2Productivity
If manual ply cutting is used, then the device complexity is low, but the productivity deteriorates due to time-consuming manual processes and potential errors requiring rework
Solution Approach 1:
By using pre-prepared templates that accurately replicate ply geometries, the system enables faster and more reliable ply cutting without requiring complex automated equipment. The templates serve as guides that eliminate the need for time-consuming visual identification and manual measurement, thereby improving productivity while keeping equipment complexity manageable.
Solution Approach 2:
The templates are prepared in advance with all necessary cutting information, allowing the repair technician to simply follow the template guides during the actual repair process. This preliminary preparation of accurate templates significantly reduces the time required for ply cutting and eliminates errors that would require rework, thereby improving overall productivity.
3Strength
If excessive material is removed during scarfing, then the repair process is simplified, but the structural strength deteriorates due to loss of load-bearing material
Solution Approach 1:
The patent applies different scarfing depths and angles to different local areas based on the specific ply configuration and fiber orientations at each location. Rather than using a uniform scarfing approach, the method tailors the material removal to the exact local requirements, preserving load-bearing material where needed while still achieving proper scarf geometry for repair.
Solution Approach 2:
The templates are designed to show the precise scarfing boundaries and depths before the actual scarfing process begins. This preliminary guidance allows the technician to remove exactly the right amount of material in each location, avoiding both excessive removal that would weaken the structure and insufficient removal that would complicate the repair process.
4Measurement precision
If manual identification of ply boundaries is used, then the equipment complexity is low, but the measurement precision deteriorates when ply boundaries visually blend together or when manufacturing anomalies are present
Solution Approach 1:
The templates create an accurate copy of the intended ply boundary geometry, serving as a reference that does not depend on visual identification of actual ply boundaries. This is particularly valuable when ply boundaries are difficult to distinguish or when manufacturing anomalies such as overlaps, crenulations, or gaps are present, as the template provides the correct geometric reference regardless of the actual ply appearance.
Data Source
AI summary
Systems and methods for actualizing simulated scarfing and patching for repair of composite laminates. A virtual environment is provided that enables engineers to optimize a repair design and provide the most robust repair solution that meets structural requirements, while minimizing the material removal and the impact to the composite structure. An optimization algorithm is configured to adjust contour offsets for pad-up plies and adjust scarf taper ratios in any direction to reduce the amount of material removed or avoid underlying structures. Scarf repair designs are subsequently transmitted to repair technicians for manual scarfing via printed templates or automated/robotic scarfing using converted computer-readable code. The technology also provides digital data for automated repair ply cutting.