Hybrid Composite Laminate Stiffness Calculation
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Solution Overview
Problem
Conventional methods for designing composite structures, particularly hybrid composite laminates with multiple material systems, face inefficiencies in optimizing large quantities of plies and fail to account for transverse shear deformation, leading to under-conservative designs and increased complexity.
Innovation Solution
A method utilizing material invariants and lamination parameters to efficiently calculate the transverse shear stiffness and in-plane/bending stiffness of composite laminates, allowing for the optimization of hybrid composites with multiple material systems and reducing design complexity by separating material properties and ply angles effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional FEM methods are used to design composite laminates with large quantities of plies, then the design can account for detailed ply-by-ply characteristics, but the design complexity and computational requirements increase significantly
Solution Approach 1:
The patent segments the complex laminate design problem into two distinct parts: (1) macro-level lamination parameters that define the overall stacking sequence and material distribution, and (2) micro-level ply characteristics that can be aggregated. This segmentation allows the design process to work with reduced sets of variables while maintaining accuracy in predicting laminate stiffness and strength properties.
Solution Approach 2:
The patent extracts and eliminates redundant design variables by recognizing that adjacent plies with identical material properties and orientations can be represented by a single equivalent ply. This extraction process removes unnecessary complexity from the FEM model while preserving the essential mechanical behavior of the laminate structure.
2Device complexity
If conventional design methods ignore transverse shear deformation, then the design process is simpler, but the design results become under-conservative
Solution Approach 1:
The patent applies local quality by selectively incorporating transverse shear deformation effects only in regions and plies where they are mechanically significant. Rather than uniformly complicating the entire design process, the method identifies specific locations (such as thick laminates or regions with rapid thickness variations) where shear deformation must be accounted for, while maintaining simpler analysis elsewhere.
3Strength
If hybrid composite structures use multiple material systems to achieve desired performance, then the structure can be optimized for specific load paths, but the design complexity increases due to multiple material properties
Solution Approach 1:
The patent embraces asymmetry in material system selection by allowing different material systems to be strategically placed in different regions of the laminate based on local stress and strain requirements. The methodology handles asymmetric stacking sequences where material properties vary through the thickness, enabling optimization of hybrid composite structures with complex material distributions without proportionally increasing design complexity.
Data Source
AI summary
A method of configuring a composite laminate may include selecting at least two different material systems for the laminate. Each one of the material systems may have material properties and corresponding material invariants. The laminate may be comprised of a stack of plies having a stacking sequence. The method may include characterizing the stacking sequence using lamination parameters for each material system. The method may further include calculating a transverse shear stiffness of the laminate using the material invariants and the lamination parameters.