A Relationship between Thermal Diffusivity and Finite Deformation in Polymers

Wang, Y.; Wright, Neil T.

doi:10.1007/s10765-005-8600-9

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…In addition to regular metallic materials, polymers and composites are also treated with PT techniques to assess their mechanical performance, especially after plastic deformation occurs. Wang and Wright studied the change of polymer thermal diffusivity in the plastically deformed range [101]. They derived the principal diffusivity tensor as a function of the Cauchy-Green deformation tensor.…”

Section: Photothermal (Pt) Techniquesmentioning

confidence: 99%

Nondestructive Testing (NDT)

Gdoutos

2021

Solid Mechanics and Its Applications

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Commons Attribution (CC BY) license, which allows users to download, copy and build upon published articles, as long as the author and publisher are properly credited, which ensures maximum dissemination and a wider impact of our publications. Preface to "Nondestructive Testing (NDT)"Because of the unavoidable aging and deterioration of materials, the efficient maintenance of civil structures and infrastructures is becoming a major issue for public and private institutions. As a matter of fact, the structural conditions of built heritage affect both safety and economic aspects.In this context, structural health monitoring (SHM) is emerging as a crucial research field, able to provide vital information regarding the damage levels of structures and materials. In particular, by exploiting the most advanced technologies and techniques, nondestructive testing (NDT) is the ideal candidate for detecting defects and structural issues, both at the laboratory and full-scale levels, in a non-invasive way. Among others, acoustic emission, vibration-based identification methods, digital image correlation, tomography techniques, sonic-ultrasonic tests, Raman and terahertz spectroscopy, electromagnetic analysis, etc., allow us to evaluate the state of damage and its evolution over time. The aim of this book is to collect the newest contributions by eminent authors in the field of NDT-SHM, both at the material and structure scale. It therefore provides novel insight at experimental and numerical levels on the application of NDT to a wide variety of materials (concrete, steel, masonry, composites, etc.) in the field of Civil Engineering and Architecture.

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Section: Photothermal (Pt) Techniquesmentioning

confidence: 99%

Nondestructive Testing (NDT)

Gdoutos

2021

Solid Mechanics and Its Applications

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“…The use of continuous wave lasers and thermal infrared detectors and cameras In addition to regular metallic materials, polymers and composites are also treated with PT techniques to assess their mechanical performance, especially after plastic deformation occurs. Wang and Wright studied the change of polymer thermal diffusivity in the plastically deformed range [101]. They derived the principal diffusivity tensor as a function of the Cauchy-Green deformation tensor.…”

Section: Photothermal (Pt) Techniquesmentioning

confidence: 99%

Mechanical Strength Evaluation of Elastic Materials by Multiphysical Nondestructive Methods: A Review

et al. 2020

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The main purpose of industrial nondestructive testing (NDT) is to diagnose the stability, reliability and failure probability of materials, components and structures. Industrial component mechanical strength is one of the most important properties NDT is used to characterize. Subtle but perceptible changes in stress-strain behavior can be reliable indicators of defect formation. A detailed review on the state-of-the-art NDT methods using optical-radiation, photoacoustic, and photothermal techniques for mechanical strength evaluation and defect pre-diagnosis is presented in this article. Mechanical strength is analyzed in terms of the deformation/strain field, the stress-strain relation, and the residual stress in an elastic material subjected to tensile or compressive loading, or impact. By introducing typical NDT experiments, the history and features of each methodology are revisited and typical applications are discussed. This review also aims to be used as a reference toward further research and development of NDT technologies characterizing mechanical strength of materials and components.

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“…Transient methods are commonly used for the determination of heat transport in polymers at elevated temperature, due to its relatively short test duration, compared with steady-state methods; thereby allowing to reduce the specimen degradation. The following commonly used techniques may be cited: laser flash methods [3,8,9,12,[14][15][16][17][18], laser heating [19], flash radiometry technique [20,21], photothermal radiometry [22], photothermal mirage [23] and optical techniques -Rayleigh scattering [25,26], photoacoustic spectroscopy methods [24,28], unsteady state technique -step down perturbation method [10], transient methods, for example plane source technique or heat transfer in a semi-infinite solid [27,29], nonlinear least-squares criterion [30], periodical methods [31] and finally hot-wire methods [2,3,32,33] and temperature wave analysis [20,34,35].…”

Section: Determination Of the Thermal Diffusivitymentioning

confidence: 99%

Thermal diffusivity of polyolefin composites highly filled with calcium carbonate

Jakubowska¹,

Sterzyński²

2012

Polimery

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Thermal diffusivity of polyolefin composites highly filled with calcium carbonateSummary -The thermal diffusivity measurements are usually performed in order to determine the ability of polymeric materials to transport heat and to characterize the rate of heating and cooling of plastic products. In our investigations the so-called modified Angstrom method was used, and the investigations were conducted on four types of materials: blends of commercial polyolefins (PE-HD/i-PP) and three types of composites of PE-HD/i-PP/CaCO 3 where CaCO 3 was modified with calcium stearate or stearic acid and waxes or was unmodified. The content of CaCO 3 in all the blends was in the range between 48 and 64 wt. %. The results have been discussed in terms of the influence of calcium carbonate content, particles size and modification of the filler on the thermal diffusivity of highly filled polyolefin composites.

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A Relationship between Thermal Diffusivity and Finite Deformation in Polymers

Cited by 8 publications

References 13 publications

Nondestructive Testing (NDT)

Nondestructive Testing (NDT)

Mechanical Strength Evaluation of Elastic Materials by Multiphysical Nondestructive Methods: A Review

Thermal diffusivity of polyolefin composites highly filled with calcium carbonate

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