White-light speckle image correlation applied to large-strain material characterization

2009 ◽  
Vol 18 (3-4) ◽  
pp. 377-392 ◽  
Author(s):  
Giovanni B. Broggiato ◽  
Luca Cortese
Keyword(s):  
White Light ◽  
Material Characterization ◽  
Large Strain ◽  
Image Correlation ◽  
Speckle Image

scholarly journals White-light speckle image correlation applied to large-strain material characterization

2009 ◽  
pp. 377-392
Author(s):  
Giovanni B. Broggiato ◽  
Luca Cortese
Keyword(s):  
Material Characterization ◽  
Plastic Material ◽  
Large Strain ◽  
Equivalent Stress ◽  
Tensile Tests ◽  
Equivalent Strain ◽  
Image Correlation ◽  
Plastic Behavior ◽  
Full Field ◽  
Measurement Devices

In experimental mechanics, the possibility of tracking on component surfaces the full-field stress and strain states during deformation can be utilized for many purposes such as formability limits determination, quantification of stress intensification factors, material characterization and so on. Concerning the last topic, an interesting application could be a direct identification of the elasto-plastic material response up to large deformation. It is well known, in fact, that with traditional measurement devices it is possible to retrieve the true equivalent stress versus true equivalent strain data from tensile tests only up to the onset of necking, where localization starts to occur. This work aims to show how from the knowledge of a tensile test full-field strain and of load data it will be possible to obtain the full-stress field as well as the complete material elasto-plastic behavior.

Full-Field Strain Rate Measurement by White-Light Speckle Image Correlation

Strain ◽  
2009 ◽  
Vol 45 (4) ◽  
pp. 364-372 ◽  
Author(s):  
G. B. Broggiato ◽  
L. Casarotto ◽  
Z. Del Prete ◽  
D. Maccarrone
Keyword(s):  
Strain Rate ◽  
White Light ◽  
Image Correlation ◽  
Field Strain ◽  
Rate Measurement ◽  
Full Field ◽  
Speckle Image ◽  
Strain Rate Measurement

Input Data Determination for Large Strain Simulations

2015 ◽  
Vol 751 ◽  
pp. 124-130
Author(s):  
Jan Džugan ◽  
Martina Maresova ◽  
Jan Nachazel
Keyword(s):  
Numerical Simulations ◽  
Input Data ◽  
Large Strain ◽  
Fem Simulation ◽  
Material Behavior ◽  
Production Costs ◽  
Image Correlation ◽  
Compression Tests ◽  
Material Models ◽  
Strain Measurements

Numerical simulations are widely used for forming processes optimizations nowadays. They significantly contribute to improvement of forgings quality and production costs reduction. The crucial points of the numerical simulations are material input data and implemented material models. The paper is dealing with overview of methods for the input data measurement. There are discussed tests with various options of strain measurements as well as modifications of compression tests. Part of the paper is dealing with 3D strain measurements by Digital Image Correlation (DIC) enabling local strains measurements. DIC enables direct comparison of strains experimentally measured and strains obtained by numerical simulations, which is going to be presented. Finally, possibilities of complex material description considering plastic damage are presented. The last approach is the most accurate providing the most information on material behavior for FEM simulation, the procedure includes measurements on samples of various geometries with various stress strain conditions. Examples of sample sets for these measurements are shown here together with material models describing multiaxial plastic flow and damage.

Fluorescence speckle image correlation spectroscopy (Conference Presentation)

2020 ◽  
Author(s):  
Anirban Sarkar ◽  
Irène Wang ◽  
Aditya Katti ◽  
Jörg Enderlein ◽  
Jacques Derouard ◽  
...  
Keyword(s):  
Correlation Spectroscopy ◽  
Image Correlation ◽  
Speckle Image ◽  
Image Correlation Spectroscopy

Failure assessment of a woven E-glass/vinyl ester composite subjected to large deformation loading

2012 ◽  
Vol 19 (2) ◽  
pp. 183-193 ◽  
Author(s):  
David R. Hufner ◽  
Liqun Xing ◽  
Michael L. Accorsi
Keyword(s):  
Large Deformation ◽  
Large Strain ◽  
Micromechanical Model ◽  
Image Correlation ◽  
Woven Composites ◽  
Linear Behavior ◽  
Failure Assessment ◽  
Strain Components ◽  
Deformation Kinematics ◽  
Very High

AbstractWoven polymer-based composites exhibit highly non-linear behavior, which often results in very high strains to failure. A micromechanical model is developed to represent the large deformation kinematics of woven composites, and develop predictions for failure strain components in specific cases of multiaxial loading. Failure functions are proposed for macromechanical analyses of arbitrary cases of large deformation loading. The approach is validated against basic tension experiments performed using both digital image correlation and with specially designed instrumentation for large strain measurement. Predicted failure strains correspond well with experimental observations. The proposed failure functions are well suited for finite element applications involving user-defined material models.

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