Chassis Link Adhesive Joint Stress Relief
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Solution Overview
Problem
Chassis links with fiber-reinforced plastic connections experience uneven stress distribution and premature failure due to adhesive connections with identical thickness longitudinal adhesive layers, leading to increased shear stress and potential failure under tensile load.
Innovation Solution
The chassis link features a straight profile portion with varying thickness longitudinal adhesive layers, where layers become thicker further from the neutral fiber plane to relieve stress and become thinner closer to it, allowing for a more uniform stress distribution and increased loadability and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive connections with identical thickness longitudinal adhesive layers are used, then the manufacturing process is simplified, but uneven stress distribution occurs leading to premature failure
Solution Approach 1:
The patent applies local quality by varying the thickness of longitudinal adhesive layers at different positions along the supporting profile. Specifically, the adhesive layers have different thicknesses in the longitudinal direction, with thicker layers at ends and thinner layers in the middle section. This local variation in adhesive layer thickness creates a more uniform stress distribution throughout the adhesive connection, preventing stress concentrations that would lead to premature failure while maintaining manufacturing feasibility.
2Device complexity
If constant thickness adhesive layers are used, then the manufacturing complexity is reduced, but stress peaks occur at specific locations causing premature failure
Solution Approach 1:
The patent implements parameter changes by modifying the thickness parameter of the longitudinal adhesive layers along the longitudinal direction of the supporting profile. The adhesive layers transition from thicker sections at the ends to thinner sections in the middle, creating a gradient structure. This parameter variation optimizes the stress distribution and prevents stress peaks, thereby enhancing the overall strength and durability of the adhesive connection without significantly increasing manufacturing complexity.
3Ease of manufacture
If uniform adhesive layers are used, then the manufacturing process is simpler, but the load-bearing capacity and lifespan are reduced due to stress concentration
Solution Approach 1:
The patent applies local quality by varying the thickness of longitudinal adhesive layers at different positions along the supporting profile. Specifically, the adhesive layers have different thicknesses in the longitudinal direction, with thicker layers at ends and thinner layers in the middle section. This local variation in adhesive layer thickness creates a more uniform stress distribution throughout the adhesive connection, preventing stress concentrations that would lead to premature failure while maintaining manufacturing feasibility.
Solution Approach 2:
The patent implements dynamics by creating a dynamic, non-uniform adhesive layer structure that adapts to the stress distribution pattern. The varying thickness of adhesive layers along the longitudinal direction allows the connection to better handle variable loads and stress concentrations, thereby extending the service life and durability of the chassis link under operational conditions.
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 configuration ensures a uniform distribution of stresses within the adhesive connection, preventing local stress peaks and enhancing the loadability and lifespan of the chassis link by selectively influencing the force flow during tensile loading.
Implementation Method 1
The connections between the supporting profile and the two load introduction elements are formed as adhesive connections
Implementation Method 2
a shear stress occurs in the longitudinal adhesive layer between an outer tooth of this kind and the associated outer circumferential surface of the supporting profile
Data Source
AI summary
A chassis link for a motor vehicle having load introduction elements connected by a straight profile portion of fiber-reinforced plastic. The profile portion and load introduction elements are connected via an adhesive connection in a common connection portion in which an end portion of the load introduction element and an end portion engage another in positive engagement. On both sides of a profile portion neutral fiber plane, the adhesive connection has longitudinal adhesive layers extending in a longitudinal direction of the profile portion and parallel to one another in a vertical. In vertical direction of the profile portion the longitudinal adhesive layers have a cross-sectional area becoming larger with increasing distance from the neutral fiber plane so that a relief is brought about in regions of the adhesive connection which have a relatively large distance from the neutral fiber plane in vertical direction of the profile portion.