In-Situ Mechanical Testing for Characterizing Strain Localization During Deformation at Elevated Temperatures

Walley, J. L.; Wheeler, Robert W.; Uchic, Michael D.; Mills, Michael J.

doi:10.1007/s11340-011-9499-7

Cited by 59 publications

(30 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These measurements can be used in combination with orientation maps of the investigated region to relate plastic deformation to the microstructure and starting crystal orientation (Lineau et al, 1997), (Hoc and Rey, 2000), (Hoc et al, 2003), (Jin et al, 2008), (Schroeter and McDowell, 2003) (Héripré et al, 2007) (Marteau et al, 2012)as well as local Schmid and Taylor factors (Kammers and Daly, 2013), (Tschopp et al, 2009) (Tasan et al, 2014), (Han et al, 2013) (Walley et al, 2012) and even texture and lattice curvatures after deformation (Lineau et al, 1997) (Tatschl and Kolednik, 2003) (Zhao et al, 2008) (Zhang and Tong, 2004). However, until recently, the spatial resolution of DIC measurements has been inferior to that of EBSD measurements and therefore insufficient to relate deformation to the lattice rotation and curvature at the required sub-micron scale.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of the polycrystalline plasticity of austenitic stainless steel

Gioacchino

Fonseca

2015

International Journal of Plasticity

164

View full text Add to dashboard Cite

The development and validation of crystal plasticity models requires the ability to map deformation at the microstructural scale. Here, a new method of highresolution deformation mapping is used to measure strain, material rotation and lattice rotation in austenitic stainless steel at sub-micron resolution. Electron back-scatter diffraction maps are used to link the deformation to the microstructure. Deformation occurs in domains, in which most of the plastic strain originates from the activation of a single slip system with high resolved shear stress. Within domains, slip is localized in lamellar regions that increase in number with strain. The deformation incompatibility between grains that develops as a consequence of this single crystal like behaviour is accommodated by either a gradient in slip intensity and the consequent development of lattice curvature at the grain boundary or the activation of an additional high stressed slip system and the consequent formation of a complementary deformation domain within the grain. In many cases, however, lattice curvature across grain boundaries is small because the deformation domains in neighbouring grains are M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 compatible. The implications of these observations for continuum crystal plasticity modelling are discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

An experimental study of the polycrystalline plasticity of austenitic stainless steel

Gioacchino

Fonseca

2015

International Journal of Plasticity

164

View full text Add to dashboard Cite

show abstract

“…With the aid of digital image correlation the actual strain distribution within the gauge area can be determined with high resolution (see, for instance, Refs. [51][52][53][54]). This is a matter of future research.…”

Section: Mechanical Testsmentioning

confidence: 99%

A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing

et al. 2017

View full text Add to dashboard Cite

A novel miniaturized biaxial deformation rig is presented. It allows one to apply in-plane biaxial stress states with arbitrary stress ratios and to perform strain path changes on thin-sheet metals. The device is optimized for in situ usage inside a scanning electron microscope and at synchrotron beam lines. The sample has a cruciform shape and the geometry is optimized with the aid of finite element simulations. A proof-of-principle experiment confirms the successful operation of this rig.

show abstract

“…The technique is very cost effective and eliminates the subjectiveness of placing/integrating strain gauges that capture only localised strain data. The application of DIC at elevated temperatures has been successful [6][7][8] many operators opting for non-convective heating methods. The application of DIC at cryogenic temperatures is almost untried [9] and presents new challenges, to assess the robustness of speckle patterning and to develop an appropriate cooling technique.…”

Section: Introductionmentioning

confidence: 99%

Application of DIC to Extract Full Field Thermo-Mechanical Data From an HTS Coil

Pelegrin

Bailey

Crump

2018

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-A Digital Imaging Correlation (DIC) test setup was developed to accurately record the contraction of a Bi-2223 superconducting racetrack coil conduction cooled to 154 K. The coil was gripped at both ends to simultaneously measure the load and displacement induced by its own contraction. Post-processing of the DIC data derived the displacement and strain fields from two areas of interest. The global deformation of the coil structure was influenced by how it was restrained, but the stress-strain curve in the ydirection of the HTS coil was established, and its stiffness when under thermally induced strain was found to closely match that of the epoxy resin. The coefficient of thermal expansion determined from the strain-temperature curve was in the same order of magnitude as dilatometer measurements performed upon a sample removed from a similar coil and the difference attributed to small variability in the temperatures across the coil and the mechanical restraint placed on the coil.  Index Terms-HTS coils, stress, strain measurement.

show abstract

In-Situ Mechanical Testing for Characterizing Strain Localization During Deformation at Elevated Temperatures

Cited by 59 publications

References 18 publications

An experimental study of the polycrystalline plasticity of austenitic stainless steel

An experimental study of the polycrystalline plasticity of austenitic stainless steel

A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing

Application of DIC to Extract Full Field Thermo-Mechanical Data From an HTS Coil

Contact Info

Product

Resources

About