Crack detection on composite and metallic aerospace structures

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Proceedings title4th European Workshop on Structural Health Monitoring
Conference4th European Workshop on Structural Health Monitoring, July 2-4, 2008, Cracow, Poland, Cracow, Poland
Pages560569; # of pages: 10
SubjectCrack detection; ISG Sensors; Integral Strain Gauge Technology; conductive paint; sensors; crack gauges; fatigue testing.
AbstractThe Institute for Aerospace Research at the National Research Council Canada (NRC-IAR) has conducted a feasibility study on crack detection sensors for aerospace structures. As part of the feasibility study a composite specimen, modeled after ASTM E1922, was used to scrutinize several possible sensor types. Regular crack gauges, strain gauges and Integral Strain Gauges (ISG) were among the sensors considered in the study. The specimens were subjected to static and fatigue loading cases to initiate the propagation of cracks. Each candidate sensor was then analyzed on its ability to detect and quantify the extent of the damage. In addition, NRC-IAR has also developed a crack detection sensor called Surface Mountable Crack Detection Sensor (SMCS). This system consists of a three-layer insulating and conductive paint system. The area of concern is prepared in the same manner that would be used for the placement of a strain gauge. Due to the nature of the sensor, the shape and geometry is customizable to fit the needs of the region of concern. The conductive nature of the SMCS allows for the system to be interrogated using low voltage signals and minimal power. A wired interrogator that questions the integrity of the sensor has been developed with the intent of providing ease of use for an operator in the field. The experimental and finite element results were investigated to better help us understand the results from our various sensor types. Laboratory testing of composite and metallic coupons with sensors under fatigue loading has been evaluated. An installation kit for the SMCS that allows for the implementation and transfer of this technology to interested organizations has been developed. NRC-IAR is currently testing the SMCS sensors for post-flight inspection of cracked regions in aerospace structures as a means of identifying possible crack growth on the structure.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Aerospace Research
Access conditionavailable
Peer reviewedYes
NRC numberSMPL-2008-0034
NPARC number8928285
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Record identifier21eb78dd-2f36-4f42-be14-f28f6af8665c
Record created2009-04-23
Record modified2016-05-09
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