Chamfered Bolt Geometry for Strap Loop Stress Distribution
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Solution Overview
Problem
Bolts used in high tension applications, such as automotive strap loops, are prone to failure due to excessive stress at a single contact point, leading to delays and increased maintenance costs.
Innovation Solution
A novel bolt design featuring a head with multiple non-parallel sides and a chamfered body shank portion to increase surface area contact and prevent rotation, using materials like medium carbon steel or low carbon boron steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional bolt with a standard head and cylindrical shank is used in high tension applications, then the bolt structure is simple and easy to manufacture, but the contact surface area with the strap is minimal leading to excessive stress at a single contact point
Solution Approach 1:
The bolt design transitions from a traditional cylindrical shank to a polyhedral shank with multiple flat surfaces (chamfered segments). This dimensional change from a curved surface to multiple planar surfaces increases the contact surface area with the strap, distributing the tensile load across multiple contact points rather than a single point, thereby reducing stress concentration.
Solution Approach 2:
The bolt shank is segmented into multiple chamfered segments with different orientations. Each segment creates a separate contact surface with the strap, dividing the single contact point into multiple contact zones. This segmentation allows the strap to wrap around the polyhedral shank, increasing the effective contact surface area and improving stress distribution.
2Stability of the object's composition
If a traditional bolt with a standard head is used, then the manufacturing process is simple, but the bolt is prone to undesired rotation when fixed to a support
Solution Approach 1:
The bolt head features an asymmetric geometry with a curved front head side and multiple linear head sides that are non-parallel to each other. This asymmetric configuration prevents the bolt from rotating when the strap is applied, as the non-parallel surfaces create mechanical interference that blocks rotational movement while maintaining a relatively simple manufacturing process.
3Reliability
If a bolt with increased contact surface area and non-parallel head sides is used, then stress distribution and rotation prevention are improved, but the manufacturing complexity increases
Solution Approach 1:
The bolt design modifies geometric parameters such as the angles and dimensions of the chamfered segments and head sides. By optimizing these parameters, the design achieves improved stress distribution and rotation prevention while keeping the manufacturing process feasible using conventional machining methods. The specific angles and dimensions are chosen to balance performance requirements with manufacturing ease.
Data Source
AI summary
A bolt for stress reduction between strap loop applications is provided for reducing stress between strap applications using a novel bolt design. The bolt for stress reduction between strap loop applications may include a head, body, body shank portion, chamfered segment and body threaded portion. The strap may interact with multiple points of contact of the novel bolt to reduce concentration of stress, which may reduce the likelihood of failure. The head is configured to reduce undesired rotation, such that the bolt will remain in the desired position during operation.