Semi-transition structure for stretchable electronics strain distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The transition between stretchable and rigid or flexible electronic structures in combined devices is a weak point prone to breaking due to differential strain under mechanical stress, leading to reduced device lifetime.
Innovation Solution
Incorporating a semi-transition structure with a Young's modulus intermediate between the stretchable and rigid/flexible structures to distribute mechanical stress more evenly, reducing the strain gap and creating a semi-stretch transition zone that absorbs stress over a larger area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stretchable structure is directly connected to a rigid or flexible structure, then the device can achieve both stretchability and functionality, but the transition region creates a weak point where the circuit tends to break easily due to strain concentration
Solution Approach 1:
A semi-transition structure with intermediate Young's modulus is introduced between the stretchable and rigid/flexible structures. This intermediary structure has mechanical properties that are neither fully stretchable nor fully rigid, allowing it to bridge the strain mismatch and distribute stress more evenly across the transition region, thereby preventing strain concentration and improving connection reliability.
Solution Approach 2:
The Young's modulus parameter is gradually changed through the semi-transition structure, transitioning from the low modulus of the stretchable structure to the high modulus of the rigid/flexible structure. This gradual parameter change prevents abrupt mechanical property transitions, reduces stress concentration, and improves the overall reliability of the connection.
2Adaptability or versatility
If the young modulus of the transition structure is mismatched with the stretchable and rigid/flexible structures, then the structure can maintain distinct functional zones, but plastic deformation concentrates at the transition creating a weak point
Solution Approach 1:
The semi-transition structure provides local quality variation by having different Young's modulus values at different locations along the transition zone. The structure gradually transitions from stretchable to rigid properties, creating local regions with intermediate mechanical characteristics that distribute plastic deformation and prevent concentration at a single weak point.
3Reliability
If a semi-transition structure with intermediate young modulus is introduced, then stress distribution is improved and lifetime is increased, but the device complexity increases
Solution Approach 1:
The transition zone is segmented into multiple regions with progressively different mechanical properties. Rather than a single abrupt transition, the structure is divided into segments that gradually change from stretchable to rigid characteristics, distributing the transition over a longer length and reducing overall complexity while improving stress distribution.
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 semi-transition structure effectively reduces plastic deformation and stress concentration, increasing the overall device lifetime by distributing mechanical stress more evenly across the transition region.
Implementation Method 1
the semi-transition structure having a third young modulus with a value in a range between the first and the second young modulus
Implementation Method 2
the semi-transition structure allows improving the repartition of mechanical stress in the stretchable substrate during any strain (elongation or torsion) of stretchable electronics
Implementation Method 3
a concentration of plastic deformation at the transition between both structures is introduced
Implementation Method 4
The semi-stretch zone is designed to have less deformation under a stress than the stretchable structure, as a result of which it is able to reduce the strain gap
Data Source
Figure 1~2(d)
Figure 3~4
Figure 5a~5h
AI summary
An electronic device comprising at least one combination of a stretchable electronic structure having a first young modulus and a rigid or flexible electronic structure having a second young modulus higher than the first young modulus, the stretchable electronic structure and the rigid or flexible electronic structure being electrically connected to each other by a semi-transition structure having a third young modulus with a value in a range between the first and the second young modulus.