Multishear Mechanical Link Stress Distribution
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Solution Overview
Problem
Existing mechanical links for composite structures, such as wind turbine blades, face issues with uneven stress distribution, local over-stress, and complexity in stress calculation, leading to reliability and optimization challenges, particularly in large-scale composite parts that require high mechanical stress resistance and durability.
Innovation Solution
A multishear mechanical link method is developed, breaking down the system into subassemblies with defined shear interfaces, applying the Huth method for computer-assisted calculations, and representing subassemblies as sets of springs to optimize material distribution and stress management, allowing for iterative adjustments to ensure balanced stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple interfacing metal parts with discrete mechanical attachment means are used to create mechanical links between composite structures, then the link can be disassembled and assembled, but the stress is not distributed uniformly over the entire wall of the composite structure, generating local over-stress and risk of progressive failure
Solution Approach 1:
The patent segments the composite structure wall into multiple discrete attachment locations where mechanical attachment means are distributed. Instead of using continuous bonding, the structure is divided into segments connected by discrete pins, bolts, or other mechanical means at specific intervals, allowing disassembly while distributing stress across multiple points rather than concentrating it in one area.
Solution Approach 2:
The patent transitions from discrete point-attachment to a distributed multi-dimensional attachment system. Mechanical attachment means are arranged in patterns across the surface area of the composite wall, utilizing two-dimensional distribution to spread stress uniformly throughout the structure rather than concentrating it at single points.
2Ease of manufacture
If discrete mechanical attachment means are used to create mechanical links, then assembly is simplified, but the calculations become complex due to multiple phenomena including stress transfer, shear, matting, tensile strength, and scribing
Solution Approach 1:
The patent introduces standardized mechanical attachment means as intermediary elements between the composite structure and loading points. These intermediaries (pins, bolts, clips) serve as universal connection points that simplify assembly while their standardized geometry and material properties enable simplified calculation models based on established shear and tensile strength formulas rather than complex multi-physics analysis.
Solution Approach 2:
The patent changes the design parameters from continuous stress distribution to discrete stress points with standardized attachment means. By defining specific geometric parameters (pin diameter, bolt size, attachment spacing) and material properties, the complex continuous problem is transformed into a discrete parameter-based calculation system using standard engineering formulas for shear, tension, and bearing stress.
3Device complexity
If traditional shear calculation methods like the Huth method are used, then calculations are simplified through geometric approximation, but asymmetrical geometric links cannot be examined and the model is not adapted for multishear cases
Solution Approach 1:
The patent segments the complex geometric link into multiple simpler sub-assemblies, each representing a basic shear interface. By dividing the overall structure into discrete segments with standardized connection points, the system can handle asymmetrical geometries and multishear cases by applying simple shear calculations to each segment independently rather than requiring complex global analysis.
Solution Approach 2:
The patent creates a universal calculation model that can handle various link geometries (symmetrical, asymmetrical, single-shear, multi-shear) through a standardized approach. The same basic shear calculation formulas are applied universally across different configurations by adjusting geometric parameters, making the method adaptable to any link type without requiring separate complex analysis for each case.
Data Source
AI summary
A method of making a mechanical multishear link includes sizing the multishear link by breaking down a system comprised by the link into as many subassemblies as there are simple shear interfaces, defining the subassemblies around each shear interface, describing each shear by its stiffness, and applying the mechanical relationships to achieve a system of equations for a computer-assisted resolution by applying the Huth method to each shear interface.