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Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality

  • Martin Brandtner-Hafner
Published/Copyright: November 15, 2018
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Materials Testing
From the journal Materials Testing Volume 60 Issue 9

Abstract

For the evaluation of adhesive quality, the prevailing situation shows that standardized mechanical tests do not generate significant quality parameters as they indicate merely the maximum bonding strength of the specimen under investigation. Furthermore, most product data sheets provided by adhesive manufacturers supply only a few technical parameters (i. e. maximum tensile strength), which, from a technical point of view, limits the selection criteria for adhesives. Considering this fact, adhesive selection can be very dangerous when relying on bonding strength alone. This is crucial for industries where human safety has top priority, such as aeronautical, automotive or medicine. Consequently, the present study introduces a new approach, using both fracture mechanics and a special test arrangement for adhesively bonded composites to overcome the above mentioned handicaps. The key benefit of this novel evaluation concept is its ability to monitor the post-cracking behavior of bonded interfaces in a stable and steady manner even for brittle adhesives. This is a major advantage over commonly practiced techniques, both from a mechanical and a fracture mechanical point of view, as they basically tend to measure instability if brittle interfaces come about. To demonstrate this new technique, experiments were conducted on six different adhesives kindly provided by SIKA and MUREXIN. The results found opposite interactions between adhesive bonding strength and fracture resistance, meaning that high tensile strength values do not automatically lead to the best results. Such findings show that the selection of adhesives with the help of fracture analysis seems quite desirable for the future.

Kurzfassung

Bei der Bewertung der Klebstoffqualität zeigt sich, dass standardisierte mechanische Prüfverfahren nur eingeschränkt in der Lage sind, signifikante Qualitätsparameter zu generieren, da sie lediglich die maximale Haftzugfestigkeit der untersuchten Probe angeben. Darüber hinaus liefern die meisten Produktdatenblätter, die von Klebstoffherstellern zur Verfügung gestellt werden, nur wenige technische Parameter, wie z. B. die maximale Zugscherfestigkeit, was die Auswahlkriterien für Klebstoffe aus technischer Sicht einschränkt. Angesichts dieser Tatsachen kann die Klebstoffauswahl sehr gefährlich und riskant sein, wenn man sich nur auf diese Haftzugwerte alleine verlässt. Dies könnte von entscheidender Bedeutung für Branchen sein, in denen die menschliche Sicherheit oberste Priorität hat, beispielsweise in der Luftfahrt, der Automobilindustrie oder der Medizin. Die vorliegende Arbeit stellt einen neuen Ansatz vor, bei dem sowohl Bruchmechanik als auch eine spezielle Versuchsanordnung an geklebten Verbundwerkstoffen zur Überwindung solcher oben genannten Nachteile eingesetzt werden. Der entscheidende Vorteil dieses neuartigen Bewertungskonzepts liegt in der Fähigkeit, das Nachbruchverhalten geklebter Grenzflächen auch für spröde Klebstoffe stabil und stetig zu untersuchen. Dies ist ein immenser Nutzen gegenüber herkömmlichen Prüfverfahren, sowohl aus mechanischer als auch aus bruchmechanischer Sicht, die dazu neigen, instabil zu messen, wenn spröde Grenzflächen ins Spiel kommen. Um diese neue Technik zu demonstrieren, wurden Experimente an sechs unterschiedlichen Klebstoffen durchgeführt, die freundlicherweise von SIKA und MUREXIN zur Verfügung gestellt wurden. Die erzielten Ergebnisse weisen auf entgegengesetzte Wechselwirkungen zwischen der Haftzugfestigkeit und dem Risswiderstand hin, was zeigt, dass hohe Zugfestigkeiten nicht automatisch den besten Klebstoff auszeichnen. Solche Erkenntnisse demonstrieren, dass die Auswahl der Klebstoffe durch die Einbeziehung der Bruchmechanik in Zukunft durchaus erstrebenswert scheint.

Keywords: Fracture mechanics; interfaces; adhesive quality; new approach; stable testing
*Correspondence Address, Dr. Martin Brandtner-Hafner, Owner and Founder of Fracture Analytics, Raiffeisenstraße 11/4/5, 7072 Mörbisch am See, Austria, E-mail:

Dr. Martin Brandtner-Hafner, born in 1977, completed his PhD in Mechanical Engineering at Vienna University Technology, Vienna, Austria, in 2016. His adviser was Prof. Dr. Elmar K. Tschegg. After his PhD, he founded his own business, Fracture Analytics, which is a privately owned and independent R&D company in Mörbisch am See, Austria. Its main focus is the fracture analytical investigation of adhesives and composites for high-tech industries in terms of risk, quality and performance.

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Published Online: 2018-11-15
Published in Print: 2018-09-30

© 2018, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Compression testing of additively manufactured continuous carbon fiber-reinforced sandwich structures
  5. Microstructure and mechanical properties of nano-carbon reinforced Cu-based powder metallurgy friction materials produced by hot isostatic pressing
  6. Thermo-mechanical testing of TiO2 functional coatings using friction stir processing
  7. Ternary melt blend based on poly (lactic acid)/chitosan and cloisite 30B: A study of microstructural, thermo-mechanical and barrier properties
  8. Untersuchungen zur verlässlichen Messung der Härte nach dem UCI – Verfahren (Ultrasonic Contact Impedance)
  9. Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
  10. Recycling of LM25 aluminum alloy scraps
  11. Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality
  12. Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
  13. Essential Work of Fracture: Bestimmung des gültigen Ligamentbereiches mittels digitaler 3D-Bildkorrelation
  14. Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites
  15. Solid particle erosion wear behavior of severe plastically deformed AA7075 alloys
  16. Performance of coated and uncoated carbide/cermet cutting tools during turning
  17. Assessment of soft materials for anthropomorphic soft robotic fingertips
  18. Application of the grey based Taguchi method and Deform-3D for optimizing multiple responses in turning of Inconel 718
https://doi.org/10.3139/120.111224
Keywords for this article
Fracture mechanics; interfaces; adhesive quality; new approach; stable testing

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Compression testing of additively manufactured continuous carbon fiber-reinforced sandwich structures
  5. Microstructure and mechanical properties of nano-carbon reinforced Cu-based powder metallurgy friction materials produced by hot isostatic pressing
  6. Thermo-mechanical testing of TiO2 functional coatings using friction stir processing
  7. Ternary melt blend based on poly (lactic acid)/chitosan and cloisite 30B: A study of microstructural, thermo-mechanical and barrier properties
  8. Untersuchungen zur verlässlichen Messung der Härte nach dem UCI – Verfahren (Ultrasonic Contact Impedance)
  9. Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
  10. Recycling of LM25 aluminum alloy scraps
  11. Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality
  12. Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
  13. Essential Work of Fracture: Bestimmung des gültigen Ligamentbereiches mittels digitaler 3D-Bildkorrelation
  14. Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites
  15. Solid particle erosion wear behavior of severe plastically deformed AA7075 alloys
  16. Performance of coated and uncoated carbide/cermet cutting tools during turning
  17. Assessment of soft materials for anthropomorphic soft robotic fingertips
  18. Application of the grey based Taguchi method and Deform-3D for optimizing multiple responses in turning of Inconel 718
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