[en] Full range constant strain rate tests are required for accurately characterizing initial yield
point, strength differential effect and direct identification of constitutive laws describing
the plastic behavior of materials. These tests require the use of a closed-loop control in
order to achieve the constant strain rate, however this feature is not available in many
laboratories. An alternative method is proposed here for full range constant strain rate
with testing machines that can be configured for user-defined displacements of the cross
head prior to testing. Tests performed at a constant die speed include a variable strain rate
response for the specimen involved. Significant deformation rate variation occurs
between the elastic and plastic range with consequences for initial yield point
identification. To overcome this drawback, appropriate user-defined displacements can
be computed and applied, allowing for both tensile and compression tests to be performed
at a constant strain rate. The method is validated using a compression test of Ti6Al4V
alloy at room temperature, as well as a 3D digital image correlation (DIC) system
exhibiting a constant strain rate value equal to 10-3 s-1, for both elastic and plastic ranges.
A non-negligible inhomogeneous strain field was measured on the surface of the
compression specimen using DIC and was corroborated by numerical modeling. Results
identified the source of the non-homogeneous strain field, thereby proposing a
quantitative indicator of plastic anisotropy. The initial yield stress and strain hardening
rates of the alloy at several temperatures were obtained with both testing method,
conventional constant cross-head speed, and the constant strain rate; these were then used
to determine the influence of the small strain rate variations on the mechanical response
of Ti6Al4V alloy.
Disciplines :
Materials science & engineering
Author, co-author :
Tuninetti, Víctor; University of Frontera (Temuco Chili)
Flores, Paulo; universidad de Concepcion
Valenzuela, Marian; Universidad Católica de Temuco
Pincheira, Gonzalo; Universidad de Talca
Medina, Carlos; Universidad de Concepción
Duchene, Laurent ; Université de Liège - ULiège > Département ArGEnCo > Analyse multi-échelles des matériaux et struct. du gén. civ.
Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Experimental characterization of the compressive mechanicalbehaviour of Ti6Al4V alloy at constant strain rates over the fullelastoplastic range
Publication date :
06 March 2020
Journal title :
International Journal of Material Forming
ISSN :
1960-6206
eISSN :
1960-6214
Publisher :
Springer, France
Special issue title :
IJMF 10TH ANNIVERSARY - ADVANCES IN MATERIAL FORMING
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