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CHAL-AMB2018-01-RS

Results for CHAL-AMB2018-01-RS: Part Residual Strains

 

1. Overview

Figure 1 indicates the measurement positions for lattice strains on the X-Z plane centered on the midplane of the specimen.  Strains along the X, Y, Z directions were measured using neutron diffraction at the NIST Center for Neutron Research (NCNR) using the BT8 diffractometer. Measurement gauge volume is approximately a cube with edges that measure 1.5 mm. The measurements were conducted for an IN625 specimen and a 15-5 stainless steel specimen on the commercial build machine (CBM).

 

Measurement locations for strain values measured at the NIST Center for Neutron Research (NCNR)
Figure 1: Measurement locations for strain values measured at the NIST Center for Neutron Research (NCNR).


2. Summary Results

Note that the measurement in the legs are not symmetric about the center of the legs in the X direction. Looking at the X-Z plane, with the Y direction into the page, the left most measurement locations in the legs are closer to the Y-Z surface. Measurement gauge volumes’ centers are 1 mm from the Y-Z surface. for the left side of the legs. Whereas the measurement gauge volumes’ centers are 1.2 mm from the Y-Z surface for the right side of the legs. 

Measured residual strains for the 15-5 test specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z)
Figure 2:  Measured residual strains for the 15-5 test specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z).

Measured residual strains for the In625 specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z)
Figure 3: Measured residual strains for the In625 specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z).


3. Data Files

The lattice strain components along the X, Y, and Z directions for each material are presented in a data table as a tab-delimited text file. Each text file contains five columns, indicating the X position, Z position, ɛyy, ɛxx, and ɛzz respectively. The X and Z directions follow the convention established by Figure 1. The X and Z positions indicate the location (in millimeters) of the center of the measurement gauge volume, with the origin set at the bottom left corner of the X-Z plane.

Links to strain results text files:

Additionally, each of the results plots in Figure 2 and Figure 3 are provided as high resolution Portable Network Graphics (*.png) image files, and Matlab figure (*.fig) files.

Link to IN625 data and  to IN625 plot figure files:

PNG files:

Matlab .fig files

 Links to 15-5 data and to  plot figure files:

PNG files:

Matlab .fig files

Created May 24, 2018, Updated November 15, 2019