Segmented Drive Shaft Testing for Fastener Shear Analysis
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Solution Overview
Problem
Current methods for testing drive shafts with fastener-based connections are time-consuming, capital-intensive, and require extensive facilities and space due to the need to test full-length shafts, making them inefficient.
Innovation Solution
A shaft testing system that uses shorter shaft segments and fewer fasteners, applying tensile loads to simulate shear forces at fastener joints, allowing for more efficient testing of load capacity and reducing material and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full-length drive shafts are tested using traditional rotation methods, then accurate load capacity data is obtained, but testing time and facility requirements increase significantly
Solution Approach 1:
The patent divides the full-length drive shaft into separate shaft segments that can be tested individually. Each segment contains the fastener joints of interest, allowing focused testing without requiring the entire shaft assembly. This segmentation enables faster testing while maintaining measurement accuracy at the critical joint locations.
Solution Approach 2:
The patent extracts the critical testing function from the full-length shaft context by isolating the shaft segments with fastener joints. By taking out only the necessary portions for testing, the method eliminates the time-consuming aspects of testing entire shaft assemblies while preserving the ability to measure load capacity accurately at the joint locations.
2Measurement precision
If full-length drive shafts are tested with extensive test facilities, then comprehensive load capacity data is obtained, but capital investment and facility space requirements increase
Solution Approach 1:
By segmenting the drive shaft into testable portions, the patent reduces the physical space needed for testing. Instead of requiring facilities capable of accommodating and rotating entire shaft assemblies, the segmented approach allows testing in more compact configurations, reducing facility footprint while maintaining measurement capabilities.
Solution Approach 2:
The patent extracts the essential testing functionality from the full-scale test facility context. By isolating the critical shaft segments and their fastener joints, the method enables testing with reduced facility requirements, eliminating the need for extensive capital investment in full-scale test infrastructure while preserving measurement accuracy.
3Force
If traditional rotation testing methods are used on full-length shafts, then shear forces are applied to fasteners, but material usage and testing complexity increase
Solution Approach 1:
The patent segments the shaft into manageable portions that can be tested with simpler apparatus. Each segment contains the fastener joints that need testing, allowing the application of shear forces through more straightforward mechanical means rather than requiring complex full-length shaft rotation systems. This reduces overall system complexity while maintaining the necessary force application capabilities.
Solution Approach 2:
The patent extracts the critical testing function from the complex full-length shaft rotation system. By isolating the shaft segments with fastener joints, the method enables shear force application through simpler, more direct means, eliminating the complexity of rotating and handling entire shaft assemblies while preserving the ability to apply and measure shear forces at the joint locations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly reduces testing time, material usage, and space requirements while maintaining accurate load capacity determination, resulting in cost savings and improved efficiency.
Implementation Method 1
displacing a first applicator part relative a second applicator part to exert a tensile force on a shaft test assembly
Implementation Method 2
measuring the shear force generated by the tensile force in the shaft test assembly
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A first shaft segment (36a) and a second shaft segment (36b) are joined by a first fastener (38a) and a second fastener (38b) to form a shaft test assembly. The first shaft segment and the second shaft segment are each curved between first and second circumferential ends. A method of testing a shaft includes displacing a first applicator part (54a) relative a second applicator part (54b) to exert a load on the shaft test assembly. The resulting shear stress on the shaft test assembly can be measured to determine material properties of the shaft. A first applicator part extends at least partially into the shaft test assembly and interfaces with the first shaft segment to apply a load. A second applicator part extends at least partially into the shaft test assembly and interfaces with the second shaft segment to apply a load.