Investigations of Single and Multilayer Structures Using Lock-In Thermography—Possible Applications

Gralewicz, Grzegorz; Owczarek, Grzegorz; Więcek, B.

doi:10.1080/10803548.2005.11076640

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…4.8. Thermal properties for CFRP in the scientific literature are given in a wide range, thus the values used in this work (thermal conductivity 5 W/mK and specific heat 1100 J/kg K) were averaged from several references covering different applications [63][64][65][66].…”

Section: Numerical Modeling Of Temperature Distributionmentioning

confidence: 99%

4. Numerical modeling of LFRP machining

Miguélez¹,

Feito²,

Santiuste³

et al. 2015

Machinability of Fibre-Reinforced Plastics

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This chapter presents some considerations for modeling long fiber reinforced polymer (LFRP) composites machining. The composite components are usually made to the desired product's final size. However, some machining operations are required to achieve dimensional tolerance and assembly requirements. LFRP composites are considered difficult to cut due to the presence of hard fibers, being especially vulnerable to machining-induced damage. Numerical modeling of machining can help in analyzing the process; however, it is a relatively new approach to the study of composite cutting. In this chapter, main contributions dealing with LFRP modeling of cutting are summarized. Recent contributions by authors in this field are included, giving the reader information on the development of numerical models that cover mechanical and thermal aspects of different cutting processes. IntroductionLong fiber reinforced polymer (LFRP) composites have been extensively used in structural components. Their attractive properties -fatigue and corrosion resistance combined with light weight, high specific stiffness and strength -made this family of materials suitable for a wide range of applications in aeronautical, automotive, marine and sporting industries.The problems associated with precision and efficiency in cutting LFRP composites have become important issues in the manufacturing field. Although the components are usually made to the final size of the desired product, machining processes (mainly trimming, milling and drilling) are needed to achieve dimensional tolerance and assembly requirements. LFRP composites are considered difficult to cut materials due to the presence of hard fibers, being especially vulnerable to damage, mainly delamination, fiber pull-out and matrix thermal degradation [1].Machining-induced damage has significant importance in industrial applications; for instance, poor hole quality in composite drilling accounts for an estimated 60 % of all parts rejection. The workpiece's surface integrity is critical for the subsequent assembly stage and, of course, during the service life of the component. In fact, recent calls for international projects deal with this unsolved problem: drilling holes in high responsibility composite components, hole quality improvement, non-destructive inspection techniques and other aspects showing the importance of high value machining operations previous to final assembly of the components.

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Section: Numerical Modeling Of Temperature Distributionmentioning

confidence: 99%

4. Numerical modeling of LFRP machining

Miguélez¹,

Feito²,

Santiuste³

et al. 2015

Machinability of Fibre-Reinforced Plastics

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“…An FFT analysis allows detecting phase shifts and the relations between the individual harmonic components for different frequencies [2,5,6,9]. Because the input signal was a sine wave, the most important observation was to note the amplitude and phase at a frequency corresponding to the input signal frequency.…”

Section: Fft Analysismentioning

confidence: 99%

“…The Authors propose a thermal model of a composite material with introduced defects, which allowed to conduct a series of computer simulations to locate the inclusions and decrements in the composite [1,2,[4][5][6][9][10].…”

Section: Introductionmentioning

confidence: 99%

Detecting flaws in composite materials - thermal model and simulation results

Gralewicz¹,

Wozny²,

Wiecek³

et al. 2008

Proceedings of the 2008 International Conference on Quantitative InfraRed Thermography

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“…The structure was examined at different modulation frequencies ranging from 1 m Hz to 10 Hz. As an exemplary structure to verify the correctness of the approach we consider thin films of teflon and epoxy placed in the carbon-fiber-reinforced-plastic (CFRP) (Gralewicz 2005),…”

Section: Periodic Excitation -Electrical Modelmentioning

confidence: 99%

Thermal model of multilayer structure for NDT thermal parameters evaluation

Gralewicz¹,

Owczarek²,

Świątczak³

et al. 2006

Proceedings of the 2006 International Conference on Quantitative InfraRed Thermography

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This paper presents the study on the mechanism of heat transport in multilayer solid body with the assumption that the heat transfer proceeds with the aid of thermal conductivity. It presents a test conducted with lock-in thermography on multilayer structure with implanted defect. The structure is made from materials of different thermal conductivity k. Different layers of tested structure described by thermal resistance and thermal capacity create supplementary circuit. The model contains the elements of the reactance character and can be used not only in qualification of static schedule of temperature, but also in investigation of transient processes.

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Investigations of Single and Multilayer Structures Using Lock-In Thermography—Possible Applications

Cited by 14 publications

References 2 publications

4. Numerical modeling of LFRP machining

4. Numerical modeling of LFRP machining

Detecting flaws in composite materials - thermal model and simulation results

Thermal model of multilayer structure for NDT thermal parameters evaluation

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