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Aerosol jet printed capacitive strain gauge for soft structural materials

Journal Article · · npj Flexible Electronics
 [1];  [1];  [2];  [3];  [4];  [3];  [3];  [3];  [3];  [3];  [3]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States); Boise State Univ., ID (United States)
  2. NASA Johnson Space Center, Houston, TX (United States)
  3. Boise State Univ., ID (United States)
  4. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Soft structural textiles, or softgoods, are used within the space industry for inflatable habitats, parachutes and decelerator systems. Evaluating the safety and structural integrity of these systems occurs through structural health monitoring systems (SHM), which integrate non-invasive/non-destructive testing methods to detect, diagnose, and locate damage. Strain/load monitoring of these systems is limited while utilizing traditional strain gauges as these gauges are typically stiff, operate at low temperatures, and fail when subjected to high strain that is a result of high loading classifying them as unsuitable for SHM of soft structural textiles. For this work, a capacitance based strain gauge (CSG) was fabricated via aerosol jet printing (AJP) using silver nanoparticle ink on a flexible polymer substrate. Printed strain gauges were then compared to a commercially available high elongation resistance-based strain gauge (HE-RSG) for their ability to monitor strained Kevlar straps having a 26.7?kN (6?klbf) load. Dynamic, static and cyclic loads were used to characterize both types of strain monitoring devices. Printed CSGs demonstrated superior performance for high elongation strain measurements when compared to commonly used HE-RSGs, and were observed to operate with a gauge factor of 5.2 when the electrode arrangement was perpendicular to the direction of strain.
Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1845449
Report Number(s):
INL/JOU-20-60620-Rev000
Journal Information:
npj Flexible Electronics, Journal Name: npj Flexible Electronics Vol. 4; ISSN 2397-4621
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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