Angularly Offset Parabolic Wall Profile for Cable Anchor Stress Distribution
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Solution Overview
Problem
Existing cable termination designs, particularly those using revolved linear and parabolic wall profiles, face stress concentration issues in the neck region, leading to premature failure under tensile loads due to inadequate stress distribution and mechanical interference.
Innovation Solution
An anchor with a revolved wall profile defined by a portion of a parabola, angularly offset from its axis of rotation, is used to create a tangency condition at the neck boundary, a shoulder in the mid region, and a controlled slope transition, optimizing stress distribution across the neck, mid, and distal regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a revolved linear or parabolic wall profile is used in the anchor, then the anchor can provide mechanical interference to retain the potted region, but stress concentration occurs in the neck region leading to premature failure
Solution Approach 1:
The patent applies asymmetry by angularly offsetting the parabolic wall profile from the anchor's central axis. This creates an asymmetric geometry where the wall slope varies around the circumference, producing a more uniform stress distribution in the neck region compared to symmetric profiles. The asymmetric design eliminates stress concentration points while maintaining mechanical interference retention.
Solution Approach 2:
The patent utilizes curvature by employing a parabolic wall profile instead of linear or constant-radius arc profiles. The parabolic curve provides a gradually varying slope that better distributes stresses. When angularly offset, this curved profile creates optimal stress flow paths through the neck region, preventing stress concentration and improving both strength and reliability.
2Stress or pressure
If the wall profile is optimized for stress distribution, then peak stress concentrations are reduced, but the anchor geometry becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the parabolic wall profile through angular offset from the central axis. This single geometric parameter change (angular offset) transforms a simple symmetric profile into an asymmetric profile that optimizes stress distribution. The solution achieves stress concentration reduction through parameter modification rather than introducing complex multi-component structures.
Data Source
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AI summary
An anchor having an internal passage defined by a revolved wall profile. The anchor is conceptually divided into four regions: a neck region, a transition region, a mid region, and a distal region. Each of these regions has its own design considerations. A portion of a parabola is used to define at least part of the revolved wall profile. The parabolic portion is preferably used in at least the neck and mid regions. In order to create a tangency condition proximate the neck anchor boundary, the parabola used to create the wall profile is angularly offset from the wall profile's axis of rotation.