期刊
IEEE 72ND ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC 2022)
卷 -, 期 -, 页码 1524-1530出版社
IEEE
DOI: 10.1109/ECTC51906.2022.00243
关键词
stretchable conductor; serpentine; electrotechnical; reliability; tensile; fatigue cycling
资金
- Air Force Research Laboratory via FlexTech Alliance, Inc. [FA865015-2-5401]
In this study, commercially available stretchable hybrid conductors were screen printed on thermoplastic polyurethane (TPU) and encapsulated with a stretchable dielectric. The test showed that increasing the strain amplitude resulted in an increase in electrical resistance. The serpentine traces had a lower rate of damage accumulation compared to straight traces.
In this study, commercially available stretchable hybrid conductors including silver flakes in an elastomeric matrix were screen printed on thermoplastic polyurethane (TPU) followed by encapsulation via the stretchable dielectric. Test vehicles include straight and serpentine lines with various thicknesses and wavelengths, respectively. Metrology was also performed to assess line thickness, width, and variability. The modular force stage (IVIFS) was used to characterize the initiation and propagation of microcracks. The results of the uniaxial tensile test showed that increasing the strain amplitude resulted in an increase in the electrical resistance and the rate of damage accumulation in the serpentine traces was lower than that of the straight traces. Additionally, the serpentine trace with the highest ratio of meander arm length to curvature remained conductive up to a strain amplitude of 150%. A systematic increase in electrical resistance from cycle to cycle was observed when the conductor was subjected to a strain amplitude of 10% for 1000 stretching cycles. The effect of processing conditions as well as test conditions will be discussed in detail.
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