A New Technique for Curved Rod Bending Tests Based on Digital Image Correlation

Author(s):  
S. García-Vilana ◽  
D. Sánchez-Molina ◽  
J. Llumà ◽  
J. Velázquez-Ameijide ◽  
C. Arregui-Dalmases
2015 ◽  
Vol 8 (3) ◽  
pp. 323-340 ◽  
Author(s):  
A. H. A. SANTOS ◽  
R. L. S. PITANGUEIRA ◽  
G. O. RIBEIRO ◽  
R. B. CALDAS

Size effect is an important issue in concrete structures bearing in mind that it can influence many aspects of analysis such as strength, brittleness and structural ductility, fracture toughness and fracture energy, among others. Further this, ever more new methods are being developed to evaluate displacement fields in structures. In this paper an experimental evaluation of the size effect is performed applying Digital Image Correlation (DIC) technique to measure displacements on the surface of beams. Three point bending tests were performed on three different size concrete beams with a notch at the midspan. The results allow a better understanding of the size effect and demonstrate the efficiency of Digital Image Correlation to obtain measures of displacements.


2021 ◽  
Vol 306 ◽  
pp. 124841
Author(s):  
Nan Zhang ◽  
Ahmadreza Hedayat ◽  
Héctor Gelber Bolaños Sosa ◽  
Néstor Tupa ◽  
Isaac Yanqui Morales ◽  
...  

2019 ◽  
Vol 54 (2) ◽  
pp. 139-148 ◽  
Author(s):  
Valentino AM Cristino ◽  
Joao P Magrinho ◽  
Gabriel Centeno ◽  
Maria Beatriz Silva ◽  
Paulo AF Martins

This article describes a methodology to characterize the failure limits by necking and fracture, and to determine the critical value of ductile damage in tube forming. The methodology makes use of digital image correlation, thickness measurements and force–displacement evolutions to obtain the strain loading paths and the strain values at the onsets of failure by necking and fracture. The onset of failure by necking is determined by a new technique that combines the strain and force–displacement evolutions whereas the fracture strains at the cracked regions of the tubes are obtained by a similar technique utilized by the authors in sheet metal forming. Transformation of the strain loading paths from principal strain space into the space of effective strain versus stress-triaxiality allows determining the critical experimental value of ductile damage at the onset of failure by necking. The methodology is applied to tube expansion with circular, elliptical and square cross-section punches and results confirm its importance and helpfulness for researchers and engineers involved in the development and optimization of industrial tube forming processes.


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