Stiffened Panel Strain Analysis with Out-of-Plane Effects
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Solution Overview
Problem
Current structural modeling methods fail to account for out-of-plane (OOP) effects, leading to unpredictable failures in stiffened panel structures under load, as they assume purely in-plane behavior, resulting in potential failure at lower loads than expected.
Innovation Solution
A method that models stiffened panel structures as both continuous and local beams, taking into account OOP effects by calculating boundary conditions and strain at specific analysis points, allowing for geometry modifications to meet strain allowable tolerances and determining a reserve factor for load adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional in-plane structural modeling methods are used, then the modeling process is simple, but the structure may fail at lower loads than predicted due to unaccounted OOP effects
Solution Approach 1:
The patent segments the stiffened panel structure into discrete elements (panels and stiffeners) that can be individually modeled and analyzed. This segmentation allows the application of different modeling approaches (in-plane for simple cases, OOP-inclusive for critical regions) to different parts of the structure, resolving the contradiction between modeling simplicity and reliability.
Solution Approach 2:
The patent transitions from traditional 2D in-plane modeling to 3D OOP-inclusive modeling by incorporating out-of-plane displacement, rotation, and loading effects. This dimensional expansion captures the full structural behavior, preventing unexpected failures while maintaining computational feasibility through selective application to critical regions.
2Reliability
If additional tolerance is built into the structure to account for real-world factors, then structural reliability improves, but material usage and weight increase
Solution Approach 1:
The patent applies OOP-inclusive modeling selectively to critical regions and load cases rather than uniformly across the entire structure. This partial application provides enhanced reliability where needed while avoiding unnecessary material usage in non-critical areas, resolving the contradiction between reliability and material efficiency.
Solution Approach 2:
The patent replaces the mechanical approach of adding material tolerance with a computational approach that uses advanced modeling to predict and account for OOP effects. This substitution maintains reliability through accurate analysis rather than through excessive material usage.
3Measurement precision
If OOP effects are incorporated into the modeling, then strain calculation accuracy improves, but the analysis complexity increases
Solution Approach 1:
The patent applies different levels of modeling complexity to different regions of the structure based on their importance and sensitivity to OOP effects. Critical regions receive full OOP-inclusive analysis for high accuracy, while non-critical regions use simpler models, resolving the contradiction between accuracy and analysis complexity.
Solution Approach 2:
The patent introduces additional parameters (OOP displacements, rotations, and boundary conditions) only where necessary to capture critical structural behavior. This selective parameter expansion improves strain calculation accuracy for critical regions without unnecessarily complicating the overall analysis.
Data Source
AI summary
A method, apparatus and computer program product is disclosed for determining the strain induced at a selected point in a stiffened panel structure in response to a load, taking into account one or more out of plane (OOP) effects.