&lt;title&gt;Predicting the geometry and location of defects in adhesive and spot-welded lap joints using steady-state thermographic techniques&lt;/title&gt;

Türler, Daniel; Orlando, Ernest

doi:10.1117/12.342333

Cited by 7 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These applications included the composite crack detection [19,20], the evaluation of impact damage in graphite epoxy [8] and the delaminations detection [9]. In more related applications Turler [10] reported the use of steady state thermographic technique in predicting the geometry and location of defects in adhesive and spot welded steel lap joints. Aglan et al [11] used the infrared thermography for the detection of cumulative fatigue disbond of adhesive steel joints.…”

Section: Motivationmentioning

confidence: 99%

Infrared thermography for inspecting the adhesion integrity of plastic welded joints

Omar

Hassan

Donohue

et al. 2006

NDT & E International

View full text Add to dashboard Cite

Section: Motivationmentioning

confidence: 99%

Infrared thermography for inspecting the adhesion integrity of plastic welded joints

Omar

Hassan

Donohue

et al. 2006

NDT & E International

View full text Add to dashboard Cite

“…Previous authors have demonstrated that fabrication defects in bonded joints can be easily detected using infrared thermography [4,5,6]. The detection and sizing of damage in adhesively bonded joints is particularly well captured by thermographic imaging, as the damage plane is typically perpendicular to the thermal wave propagation direction [7,8]. For example, Meola et al [6] demonstrated that surface roughness, artificial defects and grooves could be imaged in adhesively-bonded metallic joints using lock-in thermography.…”

Section: Introductionmentioning

confidence: 99%

Pulsed phase thermography imaging of fatigue-loaded composite adhesively bonded joints

Shin

Webb

Peters

2016

NDT & E International

View full text Add to dashboard Cite

We applied pulsed phase thermography to image and size damage in adhesively bonded joints. Specifically, the initiation and propagation of fatigueinduced damage in single lap joints with carbon fiber epoxy adherends was investigated. Lap joint specimens with various levels of manufacturing defects were fabricated and loaded in low-cycle fatigue. A calibration specimen with artificial defects was used to design a threshold algorithm for sizing of the damaged regions. The dominant failure mode in specimens without manufacturing defects was fiber-failure, whereas joints failing prematurely demonstrated adhesive failure. Imaging of the lap joints after regular number of fatigue cycles revealed that manufacturing defects could be detected and the resulting, imminent adhesive failure could be identified prior to joint failure. Additionally, the extent of this damage could be accurately estimated through the sizing algorithm. Due to the brittle nature of fiber-failure, it could not be detected prior to failure of the joint, however this was not critical, as the goal was identify premature failure of the adhesively bonded

show abstract

Infrared Thermography

Griffith¹,

T��rler²,

Goudey³

2002

Encyclopedia of Imaging Science and Technology

View full text Add to dashboard Cite

Infrared (IR) thermographic systems, or IR imagers, provide images that represent surface temperatures, or thermograms , by measuring the magnitude of infrared radiation emanating from the surface of an object. Because IR imagers see the radiation naturally emitted by objects, imaging may be performed in the absence of any additional light source. Modern IR imagers resolve surface temperature differences of 0.1 °C or less. At this high sensitivity, they can evaluate subtle thermal phenomena that are revealed only as slight temperature gradients. Some applications that employ IR thermography include inspections for predictive maintenance, nondestructive evaluation of thermal and mechanical properties, building science, military reconnaissance and weapons guidance, and medical imaging. Infrared thermography can be used both as a qualitative and a quantitative tool. Some applications do not require exact surface temperatures. In such cases, it is sufficient to acquire thermal signatures , characteristic patterns of relative temperatures of phenomena or objects. This method of qualitative visual inspection is expedient for collecting a large number of detailed data and conveying them, so that they can be easily interpreted. In contrast, accurate quantitative thermography demands a more rigorous procedure to extract valid temperature maps from raw thermal images. However, the extra effort can produce large arrays of high‐resolution temperature data that are unrivaled by contact thermal measurement techniques, such as using thermocouple wires. A skilled operator of an IR thermographic system, or thermographer , must be conscious of the possibility that reflected or transmitted, rather than emitted, IR radiation may be emanating from an object. These additional sources manifest themselves as signals that appear to be, but are not actually, based exclusively on the temperature of the spot being imaged. To understand the challenges and possibilities of IR thermography, it is necessary to review the principles of physics on which it relies. Types of imaging systems, guidance and good practice in operation are covered.

show abstract

<title>Predicting the geometry and location of defects in adhesive and spot-welded lap joints using steady-state thermographic techniques</title>

Cited by 7 publications

References 0 publications

Infrared thermography for inspecting the adhesion integrity of plastic welded joints

Infrared thermography for inspecting the adhesion integrity of plastic welded joints

Pulsed phase thermography imaging of fatigue-loaded composite adhesively bonded joints

Infrared Thermography

Contact Info

Product

Resources

About