Dielectric Elastomer Transducer Pre-Stretching Method
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Solution Overview
Problem
Dielectric elastomer transducers face challenges in maintaining high repeatability due to the degradation of dielectric elastomer layers when substantially deformed, which affects their efficiency in actuation and power generation.
Innovation Solution
A method involving pre-stretching the dielectric elastomer layer to reduce hysteresis, where the layer is stretched to a low elasticity region and then fixed with a support member under a second, lower tension, creating a stress-strain curve with distinct regions for improved elasticity and repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the dielectric elastomer layer is substantially deformed to improve energy conversion efficiency, then the expansion and contraction amount increases, but the reproducibility of operation degrades
Solution Approach 1:
The dielectric elastomer layer is pre-stretched in a low elasticity region before electrodes are applied, creating a preliminary deformation state that stabilizes the material structure. This pre-action prevents subsequent degradation during repeated use, allowing the layer to maintain both high expansion/contraction amplitude and operational reproducibility throughout its service life
2Reliability
If pre-stretching is applied to stabilize the dielectric elastomer layer, then operational reproducibility improves, but the manufacturing process complexity increases
Solution Approach 1:
The pre-stretching operation is performed as a preliminary step before electrode application, establishing the stabilized elastomer state early in the manufacturing sequence. This timing choice integrates the stabilization process into the existing manufacturing workflow rather than adding a separate post-processing step, thereby minimizing overall process complexity while achieving improved operational reproducibility
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 method enables the manufacture of dielectric elastomer transducers that operate with high repeatability, maintaining tension and preventing unwanted loosening or changes in tension during repeated use.
Implementation Method 1
a stress-strain curve having: a low strain and high elasticity region in which the curve includes a zero-strain point and has a relatively large slope; a low elasticity region connected to a higher strain side of the low strain and high elasticity region and in which the curve has a relatively small slope
Implementation Method 2
a pre-stretching process to reduce hysteresis in elastic behavior of the dielectric elastomer layer
Data Source
Figure 1~2(d)
Figure 3~4
Figure 5(a)~5(b)
AI summary
A method is provided for manufacturing a dielectric elastomer transducer including a dielectric elastomer layer and a pair of electrode layers sandwiching the dielectric elastomer layer. The dielectric elastomer layer when stretched exhibits a stress-strain curve having: a low strain and high elasticity region in which the curve includes a zero-strain point and has a relatively large slope; a low elasticity region connected to a higher strain side of the low strain and high elasticity region and in which the curve has a relatively small slope; and a high strain region connected to a higher strain side of the low elasticity region and in which the curve has a relatively large slope or includes a rupture point. The method includes: a pre-stretching process to reduce hysteresis in elastic behavior of the dielectric elastomer layer, where the pre-stretching process includes stretching the dielectric elastomer layer one or more times by applying a load that is at least as heavy as a first load to the dielectric elastomer layer before the pair of electrodes are provided, each stretching causing the dielectric elastomer layer to undergo a first tension falling in the low elasticity region; and a dielectric elastomer layer fixing process following the pre-stretching process and including applying a second load smaller than the first load to the dielectric elastomer layer, so that the dielectric elastomer layer is fixed to a support member while undergoing a second tension smaller than the first tension.