Bendable Interior Cover Supports With Shear Joints for Adhesive Reliability
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Solution Overview
Problem
Automotive interior display systems face mechanical failure due to thermally-induced and bending-induced shear stresses, which can lead to delamination and other failures, especially when exposed to temperature fluctuations and dynamic bending configurations.
Innovation Solution
Incorporating shear joints in the support structures that connect different components of the display assembly, allowing for relative movement along an axis, and creating gaps in the adhesive layer to decouple thermally-induced and bending-induced shear stresses, thereby reducing the overall stress on the adhesive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cover substrate is made bendable to enable dynamic shape changes, then adaptability is improved, but shear stress in the adhesive layer increases leading to mechanical failure
Solution Approach 1:
The support structure is divided into multiple frame portions that can move relative to each other through shear joints. This segmentation allows the structure to accommodate bending-induced deformations without transmitting excessive shear stress to the adhesive layer, thereby maintaining adhesive integrity while enabling dynamic shape changes.
Solution Approach 2:
The support structure incorporates shear joints that provide degrees of freedom, allowing the frame portions to move dynamically relative to one another. This dynamic capability enables the structure to adapt to bending configurations while mitigating shear stress accumulation in the adhesive layer through controlled relative motion.
2Duration of action of stationary object
If the display system is exposed to thermal cycling conditions, then operational durability is tested, but thermally-induced shear stress accumulates in the adhesive layer
Solution Approach 1:
By segmenting the support structure into multiple frame portions connected by shear joints, the system can accommodate thermal expansion and contraction of different components independently. This reduces the accumulation of thermally-induced shear stress in the adhesive layer during thermal cycling, improving operational durability.
Solution Approach 2:
The shear joints introduce degrees of freedom that allow the support structure to adjust its mechanical parameters (position, orientation) in response to thermal changes. This parameter adjustment capability enables the system to withstand thermal cycling without excessive shear stress buildup in the adhesive layer.
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
The solution effectively reduces the likelihood of mechanical failure and improves the reliability and optical performance of dynamically bendable displays by mitigating shear stresses, ensuring the display systems remain functional across varying temperatures and configurations.
Implementation Method 1
an adhesive layer attaching the support structure to the cover substrate
Implementation Method 2
thermal expansion/contraction of the cover substrate and support structure
Data Source
AI summary
A display assembly for an automotive interior includes a cover substrate comprising a first major surface and a second major surface opposite the first major surface; and a support structure. The support structure comprises a plurality of frame portions adhered to separate regions of the second major surface via an adhesive layer to retain the cover substrate in a curved configuration. A shear joint couples two of the plurality of frame portions to one another, the shear joint being configured to maintain a mechanical connection between the two frame portions despite bending stresses being present in the cover substrate, while permitting the two frame portions to move relative to one another along at least a first axis. A gap in the adhesive layer is disposed proximate to the shear joint, the gap decoupling thermally-induced strain distributions of different segments of the adhesive layer from one another via the shear joint.