L-Shaped Panel Bonding with Dual-Modulus Adhesives
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Solution Overview
Problem
Existing methods for assembling vehicle body panels using high stiffness adhesives often result in joint failures due to forces applied during driving, leading to panel disengagement.
Innovation Solution
The use of a combination of two adhesives with different elastic moduli, where a first adhesive with a higher elastic modulus provides shear stiffness and a second adhesive with a lower elastic modulus acts as a peel-resistant adhesive, bonded in specific regions to form an L- or T-shaped assembly, with the second adhesive sealing the first adhesive and enhancing flexibility and peel resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high stiffness adhesives are used to bond panels, then shear stiffness is improved, but peel resistance deteriorates leading to joint failure
Solution Approach 1:
The bonding system is segmented into two distinct adhesive layers: a first adhesive layer providing shear stiffness and a second adhesive layer providing peel resistance. This segmentation allows each layer to specialize in one function, resolving the contradiction between shear stiffness and peel resistance that plagues single-adhesive systems.
Solution Approach 2:
The invention uses a composite adhesive system combining two adhesives with different mechanical properties. The first adhesive (higher elastic modulus) and second adhesive (lower elastic modulus) work together in a composite configuration, where the first layer provides structural rigidity and the second layer provides flexibility and peel resistance, thereby achieving both shear stiffness and joint reliability.
2Strength
If panels are assembled using separate coupling means such as bolts and nuts, then structural joining is achieved, but device complexity increases
Solution Approach 1:
The invention replaces mechanical fastening systems (bolts, nuts, and other coupling means) with a chemically-bonded adhesive system. This substitution eliminates the complexity of mechanical assembly while providing equivalent or superior structural joining, as the adhesive layers create continuous bonds without the discrete fasteners required by mechanical systems.
3Ease of manufacture
If a single adhesive layer is used to bond panels, then manufacturing process is simplified, but reliability under driving forces deteriorates
Solution Approach 1:
The bonding system is segmented into two distinct adhesive layers: a first adhesive layer providing shear stiffness and a second adhesive layer providing peel resistance. This segmentation allows each layer to specialize in one function, resolving the contradiction between shear stiffness and peel resistance that plagues single-adhesive systems.
Solution Approach 2:
The invention changes the parameter of adhesive elastic modulus by using two different adhesives with different moduli. The first adhesive has a higher elastic modulus for shear stiffness, while the second adhesive has a lower elastic modulus for peel resistance and flexibility. This parameter differentiation enables the system to withstand both shear and peel forces effectively.
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 approach minimizes the risk of panel disengagement by distributing forces effectively, enhancing the bond's rotational and transverse strength while preventing cleavage and peel failure, thus improving the structural integrity of the vehicle body.
Implementation Method 1
The panels are bonded by using at least a first adhesive (4) having a first elastic modulus and a second adhesive (5) having a second elastic modulus that is lower than the first elastic modulus. The first adhesive bonds the panels in a first region
Implementation Method 2
the second adhesive bonds the panels in a second region, the second region being arranged next to the first region, when seen in the cross sectional view. the second adhesive avoids cleavage of the first adhesive and is acting as the peel resistant adhesive
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
There is provided an assembly of a first panel (1) and a second panel (2), wherein a head end surface (12) of the first panel is connected to a side surface (22) of the second panel, the assembly having an L-shape or T-shape when seen in a cross sectional view. The panels are bonded using at least a first adhesive (4) having a first elastic modulus (λ1) and a second adhesive (5) having a second elastic modulus (λ2) that is lower than the first elastic modulus (λ1). The first adhesive bonds the panels in a first region, and the second adhesive bonds the panels in a second region, wherein the second region is arranged next to the first region, when seen in the cross sectional view.