Determination of the Energy Storage Rate Distribution in the Area of Strain Localization Using Infrared and Visible Imaging

Oliferuk, W.; Maj, Michał; Zembrzycki, Krzysztof

doi:10.1007/s11340-013-9819-1

Cited by 34 publications

(19 citation statements)

References 26 publications

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“…Even though the progressive dissemination of affordable digital cameras and powerful computational resources together with recent advances in image processing led finding the coordinates of the points automatically and more precisely than by hand , this technique was mainly used for measuring large displacements and strains like those occurring in composite or metal sheet forming . It is now only scarcely mentioned in recent papers such as and seems to fall progressively into disuse. The main cause is the emergence and dissemination of DIC in the experimental mechanics community .…”

Section: The Grid Method: What Are We Talking About?mentioning

confidence: 99%

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

Grédiac

Sur

Blaysat

2016

Strain

141

162

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The grid method is a technique suitable for the measurement of in-plane displacement and strain components on specimens undergoing a small deformation. It relies on a regular marking of the surfaces under investigation. Various techniques are proposed in the literature to retrieve these sought quantities from images of regular markings, but recent advances show that techniques developed initially to process fringe patterns lead to the best results. The grid method features a good compromise between measurement resolution and spatial resolution, thus making it an efficient tool to characterise strain gradients. Another advantage of this technique is the ability to establish closed-form expressions between its main metrological characteristics, thus enabling to predict them within certain limits. In this context, the objective of this paper is to give the state of the art in the grid method, the information being currently spread out in the literature. We propose first to recall various techniques that were used in the past to process grid images, to focus progressively on the one that is the most used in recent examples: the windowed Fourier transform. From a practical point of view, surfaces under investigation must be marked with grids, so the techniques available to mark specimens with grids are presented. Then we gather the information available in the recent literature to synthesise the connection between three important characteristics of full-field measurement techniques: the spatial resolution, the measurement resolution and the measurement bias. Some practical information is then offered to help the readers who discover this technique to start using it. In particular, programmes used here to process the grid images are offered to the readers on a dedicated website. We finally present some recent examples available in the literature to highlight the effectiveness of the grid method for in-plane displacement and strain measurement in real situations.

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Section: The Grid Method: What Are We Talking About?mentioning

confidence: 99%

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

Grédiac

Sur

Blaysat

2016

Strain

141

162

View full text Add to dashboard Cite

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“…Contemporary infrared (IR) imagers are characterized by a remarkable set of technical parameters, such as high temperature resolution, high frame frequency and remote operation thus allowing their use for analyzing defect accumulation and damage development in the process of mechanical loading of materials [1,2]. A number of studies to predict fracture of materials have been done recently on ultrafine-grained (UFG) metals subjected to mechanical stimulation by thermographically analyzing their dynamic temperature response [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Analyzing Deformation and Damage of VT1-0 Titanium in Different Structural States by Using Infrared Thermography

et al. 2016

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This study is devoted to the comparison of strength characteristics in the process of deformation and damage of axially strained VT1-0 titanium in the ultrafinegrained (UFG) and coarse-grained (CG) states. The temperature distributions on the surface of titanium specimens were recorded by means of IR thermography. The VT1-0 titanium in UFG state formed by applying severe plastic deformation is characterized by twice the yield stress and strength limit but half the deformation limit compared to CG titanium. The fracture of CG titanium is accompanied by local powerful generation of heat, while, in UFG titanium, the damage nuclei are less intense and more evenly distributed over the fracture cross-section. The titanium in UFG state, being deformed, utilizes structural channels of energy absorption more efficiently than in the CG state by involving the whole deformed volume in the fracturing process.

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“…Similar responses are obtained for 2024-T3 aluminum alloy and α-titanium; both of the materials are subjected to quasi-static and dynamic loading 29 . In all the cases 29 30 31 , the rate of storage decreases as the material is plastically deformed. Our model correctly predicts the slowdown of the storage.…”

Section: Discussionmentioning

confidence: 98%

“…As mentioned above, a part of the plastic work is dissipated as heat and the rest of it increases internal energy. In the area of the strain localization, the distribution of the strain rates is not uniform and, therefore, a non-uniform temperature field is observed on the surface of the specimen 31 . Evolution of the temperature field during the deformation process is recorded by a high sensitivity IR thermography system.…”

Section: Methodsmentioning

confidence: 99%

Mechanisms-based viscoplasticity: Theoretical approach and experimental validation for steel 304L

Zubelewicz

Oliferuk

2016

Sci Rep

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We propose a mechanisms-based viscoplasticity approach for metals and alloys. First, we derive a stochastic model for thermally-activated motion of dislocations and, then, introduce power-law flow rules. The overall plastic deformation includes local plastic slip events taken with an appropriate weight assigned to each angle of the plane misorientation from the direction of maximum shear stress. As deformation progresses, the material experiences successive reorganizations of the slip systems. The microstructural evolution causes that a portion of energy expended on plastic deformation is dissipated and the rest is stored in the defect structures. We show that the reorganizations are stable in a homogeneously deformed material. The concept is tested for steel 304L, where we reproduce experimentally obtained stress-strain responses, we construct the Frost-Ashby deformation map and predict the rate of the energy storage. The storage is assessed in terms of synchronized measurements of temperature and displacement distributions on the specimen surface during tensile loading.

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Determination of the Energy Storage Rate Distribution in the Area of Strain Localization Using Infrared and Visible Imaging

Cited by 34 publications

References 26 publications

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

Analyzing Deformation and Damage of VT1-0 Titanium in Different Structural States by Using Infrared Thermography

Mechanisms-based viscoplasticity: Theoretical approach and experimental validation for steel 304L

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