Gegenüberstellung der induktiv angeregten Shearografie und Thermographie als zerstörungsfreie Prüfverfahren zur Detektion klebrelevanter Fehler an hochfesten Strukturklebungen und elastischen Dickschichtklebungen
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Igor Kryukov
, Martin Kahlmeyer and Stefan Böhm
Kurzfassung
In diesem Beitrag wird das Einsatzpotential der induktiv angeregten Shearografie mit dem der aktiven Thermografie zur zerstörungsfreien Prüfung von Klebverbindungen verglichen. Untersucht wird die Detektierbarkeit unterschiedlicher Fehlerbilder an Dickschicht- und Strukturverklebungen von Aluminium- und Tiefziehstahlsubstraten. Beide Verfahren zeigen für einen Einsatz bei strukturellen Klebungen gute Ergebnisse. Die Shearografie ermöglicht die Detektion von Fehlern, die zu lokalen Steifigkeitssprüngen in der Klebverbindung führen. Diese Steifigkeitssprünge können durch eine inhomogene Durchmischung oder durch Kissing Bonds verursacht werden. Der Nachweis dieser Fehler ist bei der angewendeten Messanordnung mittels Thermografie nur schwer bis gar nicht möglich. Mittels Thermografie ist hingegen eine eindeutige Detektion von ungleichmäßigen Klebschichtdicken möglich, die mittels Shearografie bisher nicht detektiert werden konnte. Bei den elastischen Klebungen zeigt die Thermografie bei vielen Fehlertypen deutlichere Messergebnisse als die Shearografie. Fehlertypen, die sich fast ausschließlich auf die Aushärtung des Klebstoffes auswirken, sind nur durch Shearografie nachweisbar. Da beide Verfahren unterschiedliche physikalische Grundlagen ausnutzen und sich dadurch für die Detektion unterschiedlicher Fehlertypen eignen, ist eine Kombination beider Verfahren sinnvoll. Die beiden Methoden ermöglichen so den Nachweis eines Großteils der für Klebverbindungen relevanten Fehlertypen.
Abstract
This article compares the potentials of inductively excited shearography and active thermography for the non-destructive testing of adhesively bonded joints. For this purpose, the detectability of different defects of elastic and structural adhesive joints between aluminum and deep-drawing steel was investigated. Both methods show good results for the non-destructive testing of structural adhesive bonds. The use of shearography allows the detection of defects that lead to local stiffness inhomogeneities, which can be caused by unsufficient mixing of adhesive components or by kissing bonds. Measuring these defects by thermography is more challenging or almost impossible. However, active thermography is suitable to detect defects that lead to measurable temperature gradients on the substrate surfaces, which may be caused by an irregular thickness of adhesive. This defect could not be detected by shearography before. For flexible adhesive bonds, thermography showed better results than shearography. However, defects affecting the curing of adhesives could only be detected by applying shearography. Since both methods are based on different physical principles, and are thus suitable for the detection of different defects types, a combination of both non-destructive testing methods may prove beneficial. Complementing each other very well, the two methods enable examination and display of almost all relevant defects.
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© 2018, Carl Hanser Verlag, München
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Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Influence of strength and cold forming on liquid metal embrittlement due to hot-dipping of high strength structural steels
- Structure and mechanical properties of ADC 12 Al foam–polymer interpenetrating phase composites with epoxy resin or silicone
- Induction and conduction thermography: From the basics to automated testing taking into account low and high residual stresses
- A case study: Design and manufacture of an eccentric spring fatigue testing device
- Effects of process parameters on the quality of PLA products fabricated by fused deposition modeling (FDM): surface roughness and tensile strength
- Corrosion behavior of alloy AA6063-T4 in HCl and NaOH solutions
- Validierung der Resonanten Frequenzsweep-Thermografie mittels einer POD-Analyse
- Supplementary finite element analysis in experimental testing of total hip stems
- Ratcheting testing of polytetrafluoroethylene (PTFE) under multiple-step compression
- Design of vehicle parts under impact loading using a multi-objective design approach
- Interfacial and physico-mechanical properties of walnut shell fiber reinforced polyester matrix composites
- Optimization of surface roughness via the Taguchi method and investigation of energy consumption when milling spheroidal graphite cast iron materials
- Gegenüberstellung der induktiv angeregten Shearografie und Thermographie als zerstörungsfreie Prüfverfahren zur Detektion klebrelevanter Fehler an hochfesten Strukturklebungen und elastischen Dickschichtklebungen
- Effects of nano graphene particles on surface roughness and cutting temperature during MQL milling of AISI 430 stainless steel