Composite Material Thickness-Varying Part Stress Analysis
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Solution Overview
Problem
Existing methods for designing composite materials with thickness-varying parts face challenges in balancing weight reduction with strength improvement, as moderate thickness changes lead to increased weight or decreased strength due to stress concentration.
Innovation Solution
A method involving stress analysis of base, cut, and cover substrates to determine optimal placement and orientation of drop-off portions in reinforced fiber substrates, allowing for increased thickness change while reducing stress concentration and enhancing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the amount of change in the plate thickness-varying part is increased to reduce weight, then the weight of the composite material is reduced, but the strength decreases and stress concentration increases
Solution Approach 1:
The invention applies local quality by selectively positioning cut substrates at specific locations within the thickness-varying part where stress concentration is most critical. Instead of uniformly distributing cut substrates throughout the structure, the method uses stress analysis to identify high-stress regions and places cut substrates precisely in those areas, thereby locally enhancing strength where needed while maintaining overall weight reduction benefits.
Solution Approach 2:
The invention employs preliminary action by performing stress analysis before finalizing the substrate arrangement. The stress analysis is conducted in advance to predict stress concentration patterns, and based on these predictions, cut substrates are strategically positioned beforehand to prevent stress concentration issues before they occur in the actual application.
2Strength
If fiber reinforced substrates are stacked stepwise with moderate thickness change to alleviate stress concentration, then the strength is improved, but the weight increases due to excessive thick part formation
Solution Approach 1:
The invention applies local quality by selectively positioning cut substrates at specific locations within the thickness-varying part where stress concentration is most critical. Instead of uniformly distributing cut substrates throughout the structure, the method uses stress analysis to identify high-stress regions and places cut substrates precisely in those areas, thereby locally enhancing strength where needed while maintaining overall weight reduction benefits.
Solution Approach 2:
The invention employs parameter changes by optimizing the arrangement parameters of cut substrates based on stress analysis results. The position, orientation, and layering of cut substrates are adjusted as variables to achieve the optimal balance between stress concentration reduction and weight minimization, transforming the design from a fixed stepwise pattern to an optimized configuration.
Data Source
AI summary
A composite material includes stacked reinforced fiber substrates and has a thickness-varying part whose thickness in a stacking direction changes from a large thickness to a small thickness. The reinforced fiber substrate that has the drop-off portion and is positioned between a base substrate and a cover substrate in the stacking direction is set as a cut substrate. Stress analysis is performed on the base substrate, the cut substrate, and the cover substrate to calculate an evaluation value concerning stress on the cut substrate. A reinforced fiber substrate in the thickness-varying part is set at the cut substrate, based on the calculated evaluation value.