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Martin Brandtner-Hafner

Martin Brandtner-Hafner
FRACTURE ANALYTICS®

Doctor Technicarum, Vienna University of Technology, Austria
Materials Safety Evaluation

About

46
Publications
17,291
Reads
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123
Citations
Introduction
My name is Dr. Martin Brandtner-Hafner, Owner & Founder of FRACTURE ANALYTICS®, a private evaluation company from Austria, Europe. We are specialized in the empirical safety evaluation of adhesives, composites, and solid materials for high-tech applications. You may also visit our website at www.fractureanalytics.com & follow us on LinkedIN: https://at.linkedin.com/in/brandtnerhafner & YouTube: https://www.youtube.com/channel/UC5TK1LZTfgezz7fnKKcB9Zw
Additional affiliations
September 2010 - present
Higher Technical College HTL Moedling
Position
  • Lecturer
Description
  • Adhesive Testing Lab, CAD, Mechanical Engineering, Industrial Engineering.
Education
January 2003 - June 2003
University of Glasgow
Field of study
  • Economics
March 1998 - December 2013
TU Wien
Field of study
  • Industrial Engineering
September 1992 - June 1997
Higher Technical College HTL Eisenstadt
Field of study
  • Aeronautical Engineering

Publications

Publications (46)
Conference Paper
Full-text available
For adhesives, the prevailing situation shows that material parameters obtained from popular standardised tensile strength and peel tests cannot be used to make fracture mechanical statements. Unfortunately, they merely giving the maximum bonding strength of the adhesively bonded composite. Specifically, since they are pure measures assuming contin...
Conference Paper
Full-text available
In numerous fields of technology, such as construction, vehicle and aircraft engineering, structural adhesives are a key enabling technology for bonding various types of materials ensuring their structural performance and safety. The selection of the optimal adhesive is crucial for the bonding success in operation, in terms of safety, quality and p...
Article
Full-text available
In the field of biocomposites, there are many different methods when it comes to technical evaluation. Standardized key figures and failure criteria used by researchers and practitioners worldwide often lead to limited results and contradictory statements. For the decision-maker, this makes a comprehensive evaluation for a qualitative material sele...
Article
Full-text available
Adhesives have become indispensable in today's world. Their broad and varied use in industry declares this type of joining to be the key technology of the 21st century. However, the lack of meaningful performance, risk, and quality figures often mean that empirical-valid comparability and transparency is not possible. It is up to the user to work h...
Article
Full-text available
When it comes to evaluating adhesive bond performance and safety, different approaches are known. Whilst mechanical lab tests strive to measure pure bond strength via lap- shear or peel stress, fracture mechanics goes one step further. There, fracture toughness is the ultimate failure criterion indicating a materials’ resistance against crack propa...
Article
Full-text available
Adhesives are increasingly being used in the construction and building sector. On the one hand, this concerns dowel reinforcements using chemical anchors. On the other hand, the sealing and repair of cracks in structural components in the construction and building sector are still on the rise. In the field of bonding, the interface is the most crit...
Conference Paper
Full-text available
In the construction and building industry, adhesives and liquid sealants have become indispensable. The harsh conditions on-site often demand the highest performance from such products. Since adhesive applications and sealing solutions are often required in one product, so-called adhesive sealants are tailored hybrid solutions. The aim here is to c...
Cover Page
Full-text available
This techno scientific newsletter highlights the four most important mechanical test methods for adhesive evaluations and explains why it is time for innovative and, above all, scientifically sound test methods. Still today, technical evaluation of adhesives is traditionally dominated by standardized mechanical testing systems. Some of them had bee...
Cover Page
Full-text available
For façade adhesives, standard test methods based on continuum mechanics apply technical stresses as failure criterion They provide very limited information of the material behavior, and the results cannot be transferred into reality. Fracture analytical methods in turn are technically capable of an authentic analysis of failure processes of façade...
Article
Full-text available
Für den Nachweis von sicherheitskritischen Klebverbindungen eigen sich bestehende Normen und Standards nur bedingt. Faktoren wie die Haftungsgüte, diverse Versagensvorgänge und Schädigungseffekte in der Grenzschicht können bislang nicht simultan erfasst, verknüpft und in Form einer einzelnen Sicherheitskennzahl auswertet werden. Mithilfe der Brucha...
Article
Full-text available
Die technische Bewertung von Klebstoffen wird traditionell von genormten mechanischen Prüfsystemen dominiert. Sie spielen nach wie vor eine große Rolle in der Industrie. Beispiele hierfür sind ASTM D897 oder DIN EN 1465. Trotz Normung und hoher Verbreitung unterliegen diese Prüfverfahren einer Reihe von Einschränkungen.
Article
Full-text available
The technical evaluation of adhesives has traditionally been dominated by mechanical testing systems. Despite standardization, however, these methods are subject to several limitations. Using the example of wood-wood as well as wood-ceramic composites, it is shown that fracture analysis can provide a remedy for characterizing the post-failure behav...
Presentation
Full-text available
Etablierte genormte mechanische Prüfverfahren bieten einen ersten groben Überblick über die maximale Belastbarkeit einer Klebeverbindung, bis der erste Riss entsteht. In den meisten Fällen jedoch versagt der Probekörper schlagartig, wenn man über die maximal zulässige Kraft hinaus geht. Ein neuartiges Prüfkonzept ermöglicht es erstmals, spröde Werk...
Presentation
Full-text available
Established standardized mechanical test methods provide an initial rough overview of the maximum load capacity of an adhesive bond until the first cracks appear. In most cases, however, the test specimen fails abruptly when the maximum tensile strength is exceeded. A novel testing principle enables to characterize even brittle materials in a stead...
Conference Paper
Full-text available
Adhesives are already in use in the most diverse industries. Their flexibility allows them to occupy ever newer areas of joining technology. However, a look at industrial practice shows that there are no holistic evaluation methods available to assess the failure behavior and the performance of adhesive systems sufficiently. Furthermore, there is a...
Article
Full-text available
Die technische Bewertung von Klebstoffen wird traditionell von mechanischen Prüfsystemen dominiert. Trotz Normung unterliegen diese Verfahren jedoch einer Reihe von Einschränkungen. Am Beispiel von Holz-Holz- sowie Holz-Keramik-Verbunden wird gezeigt, dass die Bruchanalytik zur Charakterisierung des Nachbruchverhaltens von Klebverbindungen Abhilfe...
Cover Page
Full-text available
When it comes to evaluating adhesive bond performance and safety, different approaches are known. Whilst mechanical lab tests strive to measure pure bond strength via lap- shear or peel stress, fracture mechanics goes one step further. There, fracture toughness is the ultimate failure criterion indicating a materials’ resistance against crack propa...
Cover Page
Full-text available
In the field of biocomposites, there are many different methods when it comes to technical evaluation. Standardized key figures and failure criteria used by researchers and practitioners worldwide often lead to limited results and contradictory statements. For the decision-maker, this makes a comprehensive evaluation for a qualitative material sele...
Article
Full-text available
In numerous fields of technology, such as construction, vehicle and aircraft engineering, structural adhesives are a key enabling technology for bonding various types of materials ensuring their structural performance and safety. The selection of the optimal adhesive is crucial for the bonding success in operation, in terms of safety, quality and p...
Article
Full-text available
This study introduces a novel approach for investigating the fracture behavior and technical quality of adhesively bonded wood-ceramic interfaces for mode-I loading. For that, a special test arrangement originally used for quasi-brittle materials was applied. The key benefit of this innovative principle is the ability to describe post-cracking beha...
Article
Full-text available
Da die für eine Klebstoffselektion notwendigen Informationen größtenteils aus technischen Datenblättern der Klebstoffproduzenten stammen, ist eine umfassende wie auch unabhängige Bewertungsgrundlage nicht gegeben. Eine wissenschaftliche Studie hatte das Ziel, eine Datenbasis für signifikante Bewertungsparameter zu schaffen. Dadurch war es erstmals...
Article
Full-text available
In zahlreichen Technologiefeldern, wie dem Fahrzeug- und Flugzeugbau, werden Strukturklebstoffe als Schlüsselfügetechnologie für unlösbare Verbindungen eingesetzt, um deren strukturelle Integrität, Stabilität und Sicherheit zu gewährleisten. Die Auswahl des optimalen Klebstoffs ist dabei für die Aufrechterhaltung der Betriebssicherheit des Klebstof...
Cover Page
Although ENF tests are widely used in adhesive and composite testing, their use for authentic fracture analysis is very limited. This graphical overview provides a vivid and compact compilation of the most important stumbling blocks.
Chapter
Full-text available
In den letzten Jahren war die Reservenminimierung von Klebverbindungen aufgrund von Kostengründen immer wieder ein Thema – sei es beim Handapplizieren oder beim automatischen Klebstoffauftrag. Die Fragestellung muss daher lauten: Welche Mindestklebstoffmenge ist notwendig, um Sicherheiten gegen unkontrolliertes Versagen aufzubauen und ab welchem Kl...
Article
Full-text available
Da die für eine Klebstoffselektion notwendigen Informationen größtenteils aus technischen Datenblättern der Klebstoffproduzenten stammen, ist eine umfassende wie auch unabhängige Bewertungsgrundlage nicht gegeben. Eine neue wissenschaftliche Studie hatte deshalb das Ziel, eine Datenbasis für signifikante Bewertungsparameter zu schaffen. Dadurch ist...
Cover Page
Full-text available
Although lap-shear tests are widely used in adhesive performance testing, they are not suitable for fracture analysis. This graphical overview provides a vivid and compact compilation of the most important stumbling blocks.
Cover Page
Full-text available
Although DCB tests are widely used in adhesive and composite testing, their use for authentic fracture analysis is very limited. This graphical overview provides a vivid and compact compilation of the most important stumbling blocks.
Poster
Full-text available
This is the compendium of the novel study about assessing adhesive bonding safety presented at this year's IN-adhesives Symposium in Munich, Germany
Presentation
Full-text available
Latest video about the findings of adhesive bonding safety of structural adhesives presented at this year's IN-Adhesives Symposium in Munich, Germany.
Presentation
Full-text available
This is the official presentation of the way to adhesive bonding safety introduced at this year's IN-Adhesives Symposium in Munich, Germany
Presentation
Full-text available
Latest presentation of FRACTURE ANALYTICS at AB2019 Conference on Structural Adhesive Bonding in Porto, Portugal. It was about introducing of a new benchmark for adhesive performance via a novel testing method.
Conference Paper
Full-text available
Nowadays, structural adhesives are a key enabling technology for dissimilar material assembly. This holds especially for the automotive, general and aerospace industry, where traditional joining techniques such as welding and riveting are limited in their applicability. It is a matter of fact that the optimal choice of adhesive is crucial for bondi...
Poster
Full-text available
Nowadays, structural adhesives are a key enabling technology for dissimilar material assembly. This holds especially for automotive, general and aerospace industry, where traditional joining techniques such as welding and riveting are limited in their applicability. It is a matter of fact that the optimal choice of adhesive is crucial for bonding s...
Article
Full-text available
High-tech applications require high-tech solutions. This is especially true in the field of adhesive technology. When it comes to special applications with high safety requirements, the fracture-analytical quality assessment of adhesive bonds is a basic necessity to minimize the risk of failure and thus to achieve process reliability during operati...
Chapter
Full-text available
Bei der Klebstoffauswahl und -verarbeitung wird – aufgrund fehlender Erfahrungswerte und valider Daten – mit Reserven gearbeitet. Die bruchanalytische Bewertung von Klebeverbindungen zeigt hier als neue Analysemethode einen Weg auf, wie sich diese minimieren bzw. eliminieren und damit Ressourcen sparen lassen.
Article
Full-text available
Die Auswahl von komplexen Klebsystemen ist nach wie vor eine herausfordernde Aufgabe. Die Industriepraxis zeigt, dass technische Datenblätter der Hersteller allein noch keine Beurteilung der Klebstoff-Performance und des Versagensverhaltens erlauben. Hier kann eine ganzheitliche Bewertung auf der Basis empirisch-valider Daten weiterhelfen.
Conference Paper
Full-text available
When it comes to industrial adhesives, maximizing their longevity under the aspect of minimizing costs of maintenance and repair are basically of high interest for the operator. Specifically, high-tech industries such as aeronautical, automotive or medicine are subject to very high standards in terms of quality, performance and safety. Hence, for s...
Presentation
Full-text available
When it comes to industrial adhesives, maximizing their longevity under the aspect of minimizing costs of maintenance and repair are basically of high interest for the operator. Specifically, high-tech industries such as aeronautical, automotive or medicine are subject to very high standards in terms of quality, performance and safety. Hence, for s...
Article
Full-text available
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 parame...
Article
Full-text available
High-Tech-Anwendungen erfordern High-Tech-Lösungen. Dies gilt vor allem im Bereich der Klebtechnik. Gerade für Spezialanwendungen mit hohen Sicherheitsanforderungen ist die bruchanalytische Qualitätsbewertung von Klebeverbindungen eine Notwendigkeit, Versagensrisiko zu minimieren und somit Prozesssicherheit zu erlangen.
Article
Full-text available
Klebeverbindungen versagen aus den unterschiedlichsten Gründen, weshalb oft – aufgrund fehlender Erfahrungswerte und valider Daten – mit Reserven gearbeitet wird. Diese zu minimieren bzw. zu eliminieren, ist ein Ziel der bruchanalytischen Bewertung von Klebeverbindungen.
Poster
Full-text available
This paper addresses the fracture mechanical characterisation of notched wood-adhesive composites. Especially, contact zone properties for crack separation modes I/II/III are investigated. Fracture mechanics parameters are determined, which can be used for numerical simulations (FEM) and crack model analysis. The prevailing situation shows that tes...
Conference Paper
Full-text available
This paper addresses the fracture mechanical characterisation of interfaces of notched wood-adhesive composites. Especially, contact zone properties for crack separation modes I/II/III are investigated. Fracture mechanical parameters are determined, which can be used for numerical simulations (FEM) and crack model analysis. The prevailing situation...
Presentation
Full-text available
The first presentation of this project describing different fracture mechanisms of interfaces for different modes of loading.
Presentation
Full-text available
This presentation addresses the fracture mechanical characterization of industrial adhesives in combination with wooden substrates used for sandwiched composites. Especially, contact zone properties for three different crack separation modes were investigated. Fracture mechanical parameters were determined, which can be used for selecting the suita...

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Projects

Projects (4)
Project
In the construction and building industry, adhesives and liquid sealants have become indispensable. The harsh conditions on-site often demand the highest performance from such products. Since adhesive applications and sealing solutions are often required in one product, so-called adhesive sealants are tailored hybrid solutions. The aim here is to combine the best of two worlds. However, information from the manufacturers' technical datasheets only provides a first rough overview of their lab performance. Likewise, missing key figures and a lack of empirical data often lead to confusion among practitioners and even end in faulty applications. The resulting damage often turns out to be financial if not legal problems. To avoid such, commercially available adhesive sealants were tested for their structural bonding suitability and compared with benchmarks from the industry. It was found that one chemical system is particularly highly suitable for both, bonding and sealing building materials, respectively. This allows the user to select and optimally apply the ideal adhesive sealing system for his application.
Project
Biocomposites are fiber- or particle-reinforced materials that are partly or completely made from renewable raw materials. Both the matrix material and the fiber reinforcement can have natural origins. An important current trend is to replace traditional plastics with bio-based composites containing wood or natural fibers. Biopolymers and biocomposites are more sustainable materials with a lower environmental impact and a more favorable CO2 balance. They also help to reduce or avoid microplastic inputs into the environment when using a biodegradable plastic matrix. In addition, biocomposites can have special properties such as higher stiffness and strength. With the latest advances in injection molding and 3D printing, wood-polymer composites (WPC) and natural-fiber composites (NFC) are of great interest for various applications. As the leading provider for fracture analysis, FRACTURE ANALYTICS is pleased to introduce its first study on this promising highly sustainable material class. This study will focus on several key issues: *) Evaluation of structural safety of henequen-fiber reinforced polymers (HFRP), *) Ascertaining the influence of isotropy and specimen size on safety and performance, *) Comparative safety and performance assessment with wood-polymer composites (WPC) and structural adhesives (SA), *) Characterization of structural and interfacial damage properties by means of state-of-the-art fracture analysis. *) Value-analysis of both WPC and HFRP composites compared to structural adhesives.
Project
Nowadays, structural adhesives are a key enabling technology for dissimilar material assembly. This holds especially for automotive, general and aerospace industry, where traditional joining techniques such as welding and riveting are limited in their applicability. It is a matter of fact that the optimal choice of adhesive is crucial for bonding success in terms of structural safety, quality and performance. Unfortunately, technical data sheets provided by adhesive manufacturers are very limited in their explanatory power necessary for effective decision making during the adhesive selection process. As they are based on traditional mechanics, lap-shear tensile strength still seems the only technical benchmark today in industry. However, such a figure is subject to a lot of shortfalls and restrictions. Hence, a new study is introduced presenting an innovative alternative instead. This is accomplished by combining non-linear elastic fracture mechanics with a smart test setup. The novel method presented stands out by ensuring a stable test environment even for brittle adhesives, which is a necessary condition for generating new adhesive performance benchmarks. Such measures are necessary in order to characterize operational safety of adhesives by quantifying risk against unstable failure. In order to demonstrate this new concept, experiments were conducted on three high-performance structural adhesives from HENKEL. Results of the investigations revealed interesting interactions between adhesive bonding strength and damage tolerance. This leads to the remarkable conclusion that lap-shear based tensile strength does not seem to serve as a suitable benchmark for qualitative adhesive assessment. Instead, both the utilization of an innovative test device and the application of new performance parameters are highly representative and suitable for characterizing the safety, quality and performance of structural adhesives adequately in order to meet industrial standards and demands successfully.