In-situ neutron diffraction during biaxial deformation

Intergranular Strain Evolution During Biaxial Loading: A Multiscale FE-FFT Approach

“…Electron backscattering diffraction reveals a mild texture, the details of which are presented in Ref. 5. The grains are equiaxed with $7 microns average size.…”

“…13 Cruciform samples of 316L austenitic stainless steel were deformed under uniaxial and biaxial monotonic tensile loading and strain path changes. 5 The results showed that lattice strain evolution under monotonic equibiaxial tension (EQUI) is significantly different from uniaxial tension in a dog-bone (DB) sample.…”

“…The 200 and 220 families demonstrate elastically the most compliant and intermediate compliant average lattice strain response, respectively, for both loadings. 5 Furthermore, during DB and EQUI loadings, the average lattice strain evolution in these families shows the most interesting similarities and differences. 6 The article is divided into sections as follows.…”

“…Although biaxial testing is increasingly used to study macroscopic behavior of materials, [1][2][3] limited research efforts have been directed toward understanding the underlying microstructure and intergranular strain evolution. [4][5][6] In-situ neutron and synchrotron x-ray diffraction are well established techniques to study internal stress and microstructure evolution. [7][8][9] The evolution of diffraction peak positions, width, and intensity can provide insight into the average intergranular and intragranular strains and texture evolution within different grain families; 10 these grain families are classified according to their crystallographic orientation with respect to the diffraction vector.…”

A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing

“…This includes bulge pressure tests [14,15], flat punch [16,17], hemi-spherical punch [18], multiaxial compression tests [19] and cruciform tests [20][21][22][23][24][25][26], each with their own specific strengths and weaknesses. For low and moderate levels of plastic deformation the cruciform tests are the most versatile option since they allows applying in-plane biaxial stresses with arbitrary ratios of the stresses along the principal directions and to perform strain path changes.…”