Experimental Study on Stress Impact during FML Manufacturing on the Functional Conformity of an Embeddable SHM-Sensor-Node

Bornemann, Sarah; Lang, Walter

doi:10.3390/ecsa-8-11323

Cited by 2 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GUW-based SHM will be performed using FML-embedded MEMS vibrometers with improved resonators. In future work, an integrable sensor data acquisition node [ 22 ], will be used to wirelessly power the vibrometer and read its GUW signals.…”

Section: Discussionmentioning

confidence: 99%

MEMS Vibrometer for Structural Health Monitoring Using Guided Ultrasonic Waves

Haus

Lang

Roloff

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

Structural health monitoring of lightweight constructions made of composite materials can be performed using guided ultrasonic waves. If modern fiber metal laminates are used, this requires integrated sensors that can record the inner displacement oscillations caused by the propagating guided ultrasonic waves. Therefore, we developed a robust MEMS vibrometer that can be integrated while maintaining the structural and functional compliance of the laminate. This vibrometer is directly sensitive to the high-frequency displacements from structure-borne ultrasound when excited in a frequency range between its first and second eigenfrequency. The vibrometer is mostly realized by processes earlier developed for a pressure sensor but with additional femtosecond laser ablation and encapsulation. The piezoresistive transducer, made from silicon, is encapsulated between top and bottom glass lids. The eigenfrequencies are experimentally determined using an optical micro vibrometer setup. The MEMS vibrometer functionality and usability for structural health monitoring are demonstrated on a customized test rig by recording application-relevant guided ultrasonic wave packages with a central frequency of 100 kHz at a distance of 0.2 m from the exciting ultrasound transducer.

show abstract

Section: Discussionmentioning

confidence: 99%

MEMS Vibrometer for Structural Health Monitoring Using Guided Ultrasonic Waves

Haus

Lang

Roloff

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…To execute the miniature-autoclave test, the same setup as already presented in [17] is used. For this experiment, complete working sensor nodes are tested.…”

Section: Miniature-autoclave System Testmentioning

confidence: 99%

“…The aim of this study is to identify for which circumstances of FML part manufacturing the approach of integrating digital sensor nodes is feasible and to identify critical conditions for which an external approach is necessary because irreversible damage is expected. In our previous conference contribution [17], a proof of concept was presented, in which a selection of suited components were already put in a similar environment for 190 min. This resulted in no irreversible damage within the investigated active specimen, as well as only slight changes in the values of passive components.…”

Section: Introductionmentioning

confidence: 99%

Considerations and Limits of Embedding Sensor Nodes for Structural Health Monitoring into Fiber Metal Laminates

Bornemann

Lang

2022

Sensors

Self Cite

View full text Add to dashboard Cite

The objective of this article is to present the results of our investigations concerning the environmental conditions that can be expected during the embedding process into fibre metal laminates and the consequences for a sensor node for structural health monitoring. The idea behind this investigation is to determine for which manufacturing conditions the integration of sensor nodes into the material can be done and to identify limits for this. The sensor nodes consist of commercially available integrated circuits and passive components soldered onto an adhesive-less flexible printed circuit board. They are tested under conditions above their specified limits, to find out if they are still working reliably after experiencing 155 min of 180 ∘C and 7 bar of pressure. Apart from occurring temperature damage, the effect of surrounding fibres potentially pushing away the components under the amount of pressure of the manufacturing process, as well as the potential of shorts due to conductive fibers are investigated and suitable solutions to prevent this are evaluated. One experiment exceeding the typical requirements of a fiber metal laminate embedding process for structural components will be conducted at 250 ∘C for 10 h, in order to determine the limits of embedding electronic sensor nodes. This time and temperature combination is expected to cause irreversible damage to the electronic system. Results show that it is possible to integrate electronics into materials under conditions far above their specifications when precautions are taken but also that there are limits that must not be exceeded during the embedding process.

show abstract

Experimental Study on Stress Impact during FML Manufacturing on the Functional Conformity of an Embeddable SHM-Sensor-Node

Cited by 2 publications

References 7 publications

MEMS Vibrometer for Structural Health Monitoring Using Guided Ultrasonic Waves

MEMS Vibrometer for Structural Health Monitoring Using Guided Ultrasonic Waves

Considerations and Limits of Embedding Sensor Nodes for Structural Health Monitoring into Fiber Metal Laminates

Contact Info

Product

Resources

About