Thermographic Materials Characterization

Rösner, H.; Netzelmann, U.; Hoffmann, J.; Karpen, W.; Kramb, Victoria; Meyendorf, Norbert

doi:10.1007/978-3-662-08988-0_9

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…As already demonstrated by pioneer researchers, 53 it is well‐established that fatigue is a dissipative process 54‐58 starting at the microscopic level 59‐61 and culminating in fatigue cracks; as explained in the work of Schijve, 62 the crack onset occurs at stress amplitudes below the yield limit.…”

Section: Theory: Heat Sources Related To Fatigue Damagementioning

confidence: 79%

Fatigue limit estimation of metals based on the thermographic methods: A comprehensive review

Zaeimi,

De Finis,

Palumbo

et al. 2024

Fatigue Fract Eng Mat Struct

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Infrared thermography has been under review in the last 30 years due to its versatility and potential in the detection of the thermal signature associated with intrinsic energy phenomena due to dissipative processes, specifically those relying on mechanical fatigue. Nowadays, it is a well‐established technique that can support mechanical and structural engineers to implement a damage‐tolerant design, assess the residual life, and finally characterize the fatigue behavior of materials. The aim of this work is to review all thermography‐based approaches and procedures for fatigue limit estimation by rapid tests, drawing considerations on the applicability of thermal methods in fatigue assessment of mechanical components, proposing the capabilities of different thermal indices in fatigue assessment, and discussing the pros and cons of each method as well as the open points. On one hand, this review intends to sum up what has already been done in the field; on the other hand, it provides a guideline to direct new researches toward issues that should be resolved or understood.

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Section: Theory: Heat Sources Related To Fatigue Damagementioning

confidence: 79%

Fatigue limit estimation of metals based on the thermographic methods: A comprehensive review

Zaeimi,

De Finis,

Palumbo

et al. 2024

Fatigue Fract Eng Mat Struct

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“…Second, large areas can be tested in a short period of time. Third, the resulting temperature difference especially for CFRP is high (see Equation (1) [30]):…”

Section: Thermographymentioning

confidence: 99%

“…For CFRP, the density is relatively low, and the coefficient of thermal expansion is high which yields in a high ∆T el . Therefore, CFRP presumably shows a good contrast in a thermoelastic analysis [30].…”

Section: Thermoelastic Effectmentioning

confidence: 99%

Mechanical Behaviour of a Metal-CFRP-Hybrid Structure and Its Components under Quasi-Static and Dynamic Load at Elevated Temperature

2022

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Hybrid materials containing a light metal and CFRP are capable to make a relevant contribution in lightweight design and thereby in reducing greenhouse gases causing global warming. An aluminium CFRP-hybrid specimen with a thermoplastic interlayer that is suitable for application for the A-, B-, or C-pillar in a car is investigated in this work regarding the mechanical behaviour due to temperature variation. For this purpose, quasi-static as well as dynamic tensile tests are carried out not only for those hybrid specimens but also for their respective single-material components. Those are supported by various non-destructive testing (NDT) techniques such as thermography and CT-scans of X-ray tomography. The examination of the single materials as well as the hybrid specimens gives us the possibility to understand if a change in the damage process of the hybrid is caused by one of the single materials or the interaction of them. The use of the NDT techniques in combination with the mechanical experiments allows us to obtain a deeper look at the mechanisms causing the respective damage. It stands out that temperature changes affect the damage mechanisms in the hybrid significantly without having great influence on the single materials. In quasistatic testing, the maximum displacement of the hybrid specimens rises at elevated temperature, and in dynamic testing the initial stiffness and the sustained cycles decline significantly. It therefore can be concluded that the interfaces inside the hybrids are affected by temperature changes and play a major role concerning the damage mechanisms. The pure knowledge about the temperature behaviour of single materials is not sufficient for anticipating the behaviour of hybrid specimens under these restrictions.

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“…The technical equipment and method have now reached a stage of maturity which allows them to be used for inline full-time quality control of components. This kind of testing allows for the detection of subsurface defects, inclusions and delaminations as well as for materials characterization (Rösner et al, 2004). The inspection usually consists of three phases:…”

Section: Introductionmentioning

confidence: 99%

Effective compression algorithms for pulsed thermography data

Lugin

Netzelmann

2006

Quantitative InfraRed Thermography Journal

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Two compression algorithms for the image sequences generated by pulsed-transient thermography for non-destructive testing were developed. The first algorithm allows to balance the quality of the original measurement data reproduction against a compression ration. This algorithm comprises a dedicated space/time mapping (STM) method annd an image compression algorithm (JPE2000). The second alogithm provides lossless reproduction of the original measurement data. This algorithm is based on a particular tramsformatio of dynamically changing data and a lossless compression algorithm (ZIP). Both algorithms were tested on typical experimental thermography data. In both cases, the achieved compression ratios were significantly higher than those of existing algorithms

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Thermographic Materials Characterization

Cited by 8 publications

References 9 publications

Fatigue limit estimation of metals based on the thermographic methods: A comprehensive review

Fatigue limit estimation of metals based on the thermographic methods: A comprehensive review

Mechanical Behaviour of a Metal-CFRP-Hybrid Structure and Its Components under Quasi-Static and Dynamic Load at Elevated Temperature

Effective compression algorithms for pulsed thermography data

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