where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

Iris Inspection Services, Inc.
We are the world's largest supplier of air cooler, boiler and exchanger tubing inspection services.
NDT.net Issue - 2019-03 - Articles
NDT.net Issue: 2019-03
Publication: 10th International Symposium on NDT in Aerospace, Oct 2018, Dresden, Germany (AeroNDT 2018)
Session: Ultrasonics 2
ARTICLE

Airborne testing of molded polymer compounds

Daniel Kotschate15, Saskia Wendland2, Mate Gaal43
Akustische und Elektromagnetische Verfahren,Ultraschallsonderprüftechniken; BAM Federal Institute for Materials Research and Testing1326, Berlin, Germany

Abstract: Modern and energy-efficient materials are essential for innovative designs for aerospace and automotive industries. Current technologies for rapid manufacturing such as additive manufacturing and liquid composite molding by polymer extrusion allow innovative ways of creating robust and lightweight constructions. Commercially available printing devices often use polylactide (PLA) or acrylonitrile butadiene styrene (ABS) as raw material. Therefore, parameters like the infill ratio, influencing the ability to resist mechanical stress, may have a beneficial impact on the lifetime of components. These manufacturing technologies require a good knowledge about materials and even adapted non-destructive testing technologies and methods. Airborne ultrasonic testing has beneficial advantages for testing those lightweight constructions. It is a contact-free testing method, which does not require a liquid couplant. Therefore, it allows fast test cycles without any unwanted alternations of the material properties due to interactions with any coupling liquid. This contribution deals with the characterisation of printed specimens based on PLA by using airborne ultrasound and presents the current edge of non-destructive testing and evaluation using airborne ultrasonic transducers. The specimens, manufactured by polymer extrusion, are printed as thin plates. The infill ratio, as well as the material thickness, were varied to model density imperfections with different geometric shapes and properties. For better understanding of the limits of airborne ultrasonic testing in transmission, we compared own-developed transducers based on different physical principles: on ferroelectrets, on the thermoacoustic effect, as well as a new type of transducers based on gas discharges.


View:  
Feedback: ()

Share:
More from "Daniel Kotschate" (5 of 13)
2019-08 Herausforderungen bei der Prüfung von Schmiedeteilen durch Vorsatzkeile für Longitudinalwellenprüfköpfe
2019-03 The thermoacoustic effect and its application in air-coupled testing of composite structures
2018-08 Advances in air-coupled UT combining an optical microphone with novel transmitter concepts
2018-08 New technologies for air-coupled ultrasonic transducers
2017-09 Hochauflösende Reinheitsgradbestimmung - Fertigung von Referenzfehlern
... All 13 Details >
More from "Saskia Wendland" (1)
2019-03 The thermoacoustic effect and its application in air-coupled testing of composite structures
More from "Mate Gaal" (5 of 42)
2019-08 Charakterisierung von Luftultraschallprüfköpfen mit thermoakustischen Wandlern
2019-05 Quantification of impact damages in CFRP and GFRP structures with thermography and ultrasonics
2019-03 Air-coupled ultrasonic ferroelectret transducers with additional bias voltage for testing of composite structures
2019-03 The thermoacoustic effect and its application in air-coupled testing of composite structures
2018-09 Sandwich-Schalenstrukturen in situ charakterisiert mit Thermographie und Felddehnungsmessungen
... All 42 Details >
More from "BAM Federal Institute for Materials Research and Testing" (5 of 1325)
2020-06Analysis of Guided Wave Propagation in a Multi-Layered Structure in View of Structural Health Monitoring
2020-06GW4SHM – Guided Waves for Structural Health Monitoring NEWS
2020-03BAM leads new 3.9 Mio EUR project on structural health monitoring of safety relevant structures NEWS
2020-02Damage Quantification in Aluminium-CFRP Composite Structures using Guided Wave Wavenumber Mapping
2020-02Detection and size estimation of inclusions in a complex shaped CFRP specimen using thermography, air-coupled ultrasound and x-ray laminography.
... All 1325 Details >
Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window