Frangible Post Compression Method for Controlled Impact Failure
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Solution Overview
Problem
Current methods for creating frangible posts in roadside barriers are inefficient, leading to material waste, increased costs, and complexity in manufacturing, as they require multiple steps and pre-creation of weakened regions before construction, which are not easily implementable on-site.
Innovation Solution
A method involving the compression of post portions to form indents or notches, which creates a region of weakness that can deform under force, allowing the post to redirect impact forces while minimizing material waste and enabling on-site implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional methods (cutting out portions, forming slots or notches) are used to create weakened regions in posts, then the posts can yield during end-on impacts to reduce impact forces, but this produces unnecessary waste of post material which is expensive
Solution Approach 1:
The invention changes the physical state of the post material through compression, creating a densified region with altered mechanical properties. This compressed region serves as the weakened zone that will yield during impact, eliminating the need to remove material while achieving the same safety function.
Solution Approach 2:
Instead of extracting (removing) material to create the weakened region, the invention takes a different approach by adding compression to a specific portion of the post. This creates the weakened zone in-place without material removal, thereby eliminating waste.
2Reliability
If posts are cut and rejoined by bolting or plug welding to create weakened regions, then the posts can fail in a controlled manner during impact, but this requires multiple steps and skilled labor which increases manufacturing complexity and time
Solution Approach 1:
The invention creates a segmented structure within the post by compressing a specific portion, effectively dividing the post into a compressed (weakened) region and an uncompressed (strong) region. This internal segmentation achieves controlled failure without requiring physical separation or rejoining of post segments.
Solution Approach 2:
The invention replaces complex mechanical joining operations (cutting, bolting, welding) with a simpler compression process. The weakened region is created through mechanical compression rather than through multiple fabrication steps involving separation and rejoining.
3Ease of manufacture
If weakened regions are created prior to post installation in barrier construction, then the posts are ready for immediate use, but this unnecessarily increases costs and time as further materials and labor are required for post manufacturing
Solution Approach 1:
The invention performs the weakening action at the optimal time - during or after installation rather than during initial manufacturing. This preliminary action (in the context of installation rather than manufacturing) allows posts to be installed in their full-strength state and then selectively weakened at the precise location needed, eliminating premature material preparation.
4Strength
If conventional methods are used to form weakened regions, then posts can be made frangible, but these methods require multiple steps and skilled technique which are not easily implementable on-site
Solution Approach 1:
The invention enables the post to be self-weakened through a simple compression process that can be performed on-site without requiring skilled craftsmanship. The compression device applies force to create the weakened region, and the post itself undergoes the transformation without requiring manual cutting or joining operations.
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
This method simplifies the creation of frangible posts, reduces material waste, and allows for correct positioning of the weakened region during construction, enhancing the efficiency and cost-effectiveness of barrier system manufacturing.
Implementation Method 1
compressing a portion of a post to form an indent via
Data Source
Figure 1
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AI summary
A method of producing a frangible post characterised by the step of forming a region of weakness by compressing a portion of at least one surface and/or edge of the post.